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Container Classes 2 Dimension Font FontMetrics Component Graphics Object Color Container Panel Applet Frame Dialog Window JComponent JApplet JFrame JDialog Swing Components in the javax.swing package Lightweight Heavyweight Classes in the java.awt package 1 LayoutManager * JPanel Container classes can contain other GUI components.
GUI Helper Classes 3 The helper classes are not subclasses of Component. They are used to describe the properties of GUI components such as graphics context, colors, fonts, and dimension. Dimension Font FontMetrics Component Graphics Object Color Container Panel Applet Frame Dialog Window JComponent JApplet JFrame JDialog Swing Components in the javax.swing package Lightweight Heavyweight Classes in the java.awt package 1 LayoutManager * JPanel
Swing GUI Components 4 JMenuItem JCheckBoxMenuItem AbstractButton JComponent JMenu JRadioButtonMenuItem JToggleButton JCheckBox JRadioButton JComboBox JInternalFrame JLayeredPane JList JMenuBar JOptionPane JPopupMenu JProgressBar JFileChooser JScrollBar JScrollPane JSeparator JSplitPane JSlider JTabbedPane JTable JTableHeader JTextField JTextComponent JTextArea JToolBar JToolTip JTree JRootPane JPanel JPasswordField JColorChooser JLabel JEditorPane JSpinner JButton
Components Covered in the Core Version 5 JMenuItem JCheckBoxMenuItem AbstractButton JComponent JMenu JRadioButtonMenuItem JToggleButton JCheckBox JRadioButton JComboBox JInternalFrame JLayeredPane JList JMenuBar JOptionPane JPopupMenu JProgressBar JFileChooser JScrollBar JScrollPane JSeparator JSplitPane JSlider JTabbedPane JTable JTableHeader JTextField JTextComponent JTextArea JToolBar JToolTip JTree JRootPane JPanel JPasswordField JColorChooser JLabel JEditorPane JSpinner JButton
Components Covered in the Comprehensive Version 6 JMenuItem JCheckBoxMenuItem AbstractButton JComponent JMenu JRadioButtonMenuItem JToggleButton JCheckBox JRadioButton JComboBox JInternalFrame JLayeredPane JList JMenuBar JOptionPane JPopupMenu JProgressBar JFileChooser JScrollBar JScrollPane JSeparator JSplitPane JSlider JTabbedPane JTable JTableHeader JTextField JTextComponent JTextArea JToolBar JToolTip JTree JRootPane JPanel JPasswordField JColorChooser JLabel JEditorPane JSpinner JButton
AWT (Optional) 7 AWTEvent Font FontMetrics Component Graphics Object Color Canvas Button TextComponent Label List CheckBoxGroup CheckBox Choice Container Panel Applet Frame Dialog FileDialog Window TextField TextArea MenuComponent MenuItem MenuBar Menu Scrollbar LayoutManager
Adding Components into a Frame 8 // Add a button into the frame frame.getContentPane().add( new JButton("OK")); Run MyFrameWithComponents Title bar Content pane
Content Pane Delegation in JDK 1.5 9 // Add a button into the frame frame.getContentPane().add( new JButton("OK")); Run MyFrameWithComponents Title bar Content pane // Add a button into the frame frame.add( new JButton("OK"));
JFrame Class 10 javax.swing.JFrame +JFrame() +JFrame(title: String) +getSize(width: int, height: int): void +setLocation(x: int, y: int): void +setVisible(visible: boolean): void +setDefaultCloseOperation(mode: int): void +setLocationRelativeTo (c: Component): void Creates a default frame with no title. Creates a frame with the specified title. Specifies the size of the frame. Specifies the upper-left corner location of the frame. Sets true to display the frame. Specifies the operation when the frame is closed. Sets the location of the frame relative to the specified component. If the component is null, the frame is centered on the screen.
JFrame example • A program that sets several properties of the JFrame: import java.awt.*; import javax.swing.*; public class SimpleFrame2 { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setForeground(Color.WHITE); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocation(new Point(10, 50)); frame.setSize(new Dimension(300, 120)); frame.setTitle("A frame"); frame.setVisible(true); } } • Graphical output: 11
JFrame properties • JFrames have the following unique properties that you can get or set in your graphical programs: 12 name type description methods default close operation int what should happen when frame is closed getDefaultCloseOperation, setDefaultCloseOperation icon image Image icon in the window's title bar getIconImage, setIconImage layout LayoutManager how the frame should position its components getLayout, setLayout resizable boolean whether the window can be resized isResizable, setResizable title String window's title bar text getTitle, setTitle
Component properties • All components also have the following properties: 13 name type description methods background Color background color getBackground, setBackground enabled boolean whether the component can be interacted with isEnabled, setEnabled font Font font used to display any text on the component getFont, setFont foreground Color foreground color getForeground, setForeground location Point (x, y) position of component on screen getLocation, setLocation size Dimension width, height of component getSize, setSize preferred size Dimension width, height that the component wants to be getPreferredSize, setPreferredSize visible boolean whether the component can be seen on screen isVisible, setVisible
JButton • you can associate an icon with a Swing button. • you can define different icons that are displayed for the component when it is disabled, pressed, or selected. • Another icon can be used as a rollover icon, • which is displayed when the mouse is positioned over that component.
JButton • Swing buttons are subclasses of the AbstractButton class,
The JButton Class  The JButton class provides the functionality of a push button.  JButton allows an icon, a string, or both to be associated with the push button.  JButton() // without text/icon  JButton(Icon i) // with icon  JButton(String s) // with text  JButton(String s, Icon i) // with text and icon  Here, s and i are the string and icon used for the button.
JButton • The text associated with a button can be read and written via the following methods: • String getText( ) • void setText(String s) • Here, s is the text to be associated with the button.
• import javax.swing.*; • public class ButtonExample{ • ButtonExample(){ • JFrame f=new JFrame("Button Example"); • JButton b=new JButton(new ImageIcon("D:icon.png")); • b.setBounds(100,100,100, 40); • f.add(b); • f.setSize(300,400); • f.setLayout(null); • f.setVisible(true); • f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); • } • public static void main(String[] args) { • new ButtonExample(); • } • }
JLabel • import javax.swing.*; • class LabelExample • { • public static void main(String args[]) • { • JFrame f= new JFrame("Label Example"); • JLabel l1,l2; • l1=new JLabel("First Label."); • l1.setBounds(50,50, 100,30); • l2=new JLabel("Second Label."); • l2.setBounds(50,100, 100,30); • f.add(l1); f.add(l2); • f.setSize(300,300); • f.setLayout(null); • f.setVisible(true); • } • }
JCheckBox • If user need some way to select multiple options from many options then checkbox is useful • JCheckBox class has some advantages over awt checkbox class • Able to display images
JCheckBox • The JCheckBox class, which provides the functionality of a check box, • JCheckBox(Icon i) • JCheckBox(Icon i, boolean state) • JCheckBox(String s) • JCheckBox(String s, boolean state) • JCheckBox(String s, Icon i) • JCheckBox(String s, Icon i, boolean state) • If state is true, • the check box is initially selected. • Otherwise, it is not.
• import java.awt.*;import javax.swing.*; • class checkbox1 extends JFrame • { JCheckBox check1, check2, check3, check4; • JTextField text; • public checkbox1() • { Container contentPane = getContentPane(); • contentPane.setLayout(new FlowLayout()); • check1 = new JCheckBox("check 1",new ImageIcon("HELP.gif")); • check2 = new JCheckBox("Check 2",true); • check3 = new JCheckBox(new ImageIcon("palette_draw.gif")); • check4 = new JCheckBox("Check 4"); • contentPane.add(check1); • contentPane.add(check2); • contentPane.add(check3); • contentPane.add(check4); • text = new JTextField(20); • contentPane.add(text); • } } • public class checkboxdemo1 • {public static void main(String []a) • checkbox1 cb1=new checkbox1(); • cb1.setSize(300,400); • cb1.setVisible(true); • }}
• void setSelected(boolean state) • The state of the check box can be changed • state is true if the check box should be checked. • String getLabel() gets the label • boolean isSelected() • determine whether selected or deselected • When a check box is selected or deselected, an item event is generated. • This is handled by itemStateChanged( ). • the getItem( ) method gets the JCheckBox object that generated the event. • The getText( ) method gets the text for that check box and uses it to set the text inside the text field.
• import javax.swing.*; import java.awt.event.*; import java.awt.*; • class myframe extends JFrame implements ItemListener { • JTextField jtf; JCheckBox cb1,cb2,cb3; • public myframe() { • // Get content pane • Container c = getContentPane(); • c.setLayout(new FlowLayout()); • // Create icons • ImageIcon normal = new ImageIcon("normal.gif"); • // Add check boxes to the content pane • cb1= new JCheckBox("C", normal); • cb1.addItemListener(this); • c.add(cb1); • cb2= new JCheckBox("C++"); • cb2.addItemListener(this); • c.add(cb2); • cb3= new JCheckBox("Java"); • cb3.addItemListener(this); • c.add(cb3); • // Add text field to the content pane • jtf = new JTextField(15); • c.add(jtf); }
• public void itemStateChanged(ItemEvent ie) • { • if(ie.getItem()==cb1) • jtf.setText(cb1.getText()); • if(ie.getItem()==cb2) • jtf.setText(cb2.getText()); • if(ie.getItem()==cb3) • jtf.setText(cb3.getText()); • } • } • public class checkboxdemo1 • { • public static void main(String[] args) { • myframe frame = new myframe(); • frame.setSize(400,400); • frame.setVisible(true); • } • }
JRadioButton • If user need some way to select only one options from many options • Then JRadioButton is used class has some advantages over awt checkbox class • Able to display images
JRadioButton • JRadioButton(Icon i) • JRadioButton(Icon i, boolean state) • JRadioButton(String s) • JRadioButton(String s, boolean state) • JRadioButton(String s, Icon i) • JRadioButton(String s, Icon i, boolean state) • If state is true, the button is initially selected. Otherwise, it is not.
• Container c=getContentPane(); • JRadioButton rb1 = new JRadioButton("C"); • JRadioButton rb2 = new JRadioButton(“java”); • c.add(rb1); • c.add(rb2); • Radio buttons must be configured into a group. • Only one of the buttons in that group can be selected at any time. • ButtonGroup bg = new ButtonGroup(); • bg.add(rb1); • bg.add(rb2);
JRadioButton • JRadioButton rb1 = new JRadioButton("A"); • c.add(rb1); • JRadioButton rb2 = new JRadioButton("B"); • c.add(rb2); • JRadioButton rb3 = new JRadioButton("C"); • c.add(rb3); • ButtonGroup bg = new ButtonGroup(); • bg.add(rb1); • bg.add(rb2); • bg.add(rb3);
• import java.awt.*;import javax.swing.*; • class radiobutton extends JFrame • { • JRadioButton b1,b2,b3,b4; • ButtonGroup bg; • JLabel l1; • Container c; • public radiobutton() • {bg=new ButtonGroup(); • b1=new JRadioButton("win98"); • b2=new JRadioButton("winxp"); • b3=new JRadioButton("linux"); • b4=new JRadioButton("win2k3"); • bg.add(b1); • bg.add(b2); • bg.add(b3); • bg.add(b4); • b4.setVerticalTextPosition(SwingConstants.BOTTOM); • b4.setHorizontalTextPosition(SwingConstants.CENTER);
• c=getContentPane(); • c.setLayout(new FlowLayout()); • c.add(b1); • c.add(b2); • c.add(b3); • c.add(b4); • c.add(l1=new JLabel("")); • } • } • public class radiobutton1 • {public static void main(String []a) • { • radiobutton r=new radiobutton(); • r.setSize(300,400); • r.setVisible(true); • }}
• import java.awt.*;import javax.swing.*; • import java.awt.event.*; • class radiobutton extends JFrame implements ActionListener • { • JRadioButton b1,b2,b3,b4; • ButtonGroup bg; • Container c; • JTextField text; • public radiobutton() • { bg=new ButtonGroup(); • b1=new JRadioButton("win98"); • b2=new JRadioButton("winxp"); • b1.addActionListener(this); • b2.addActionListener(this); • bg.add(b1); • bg.add(b2); • c=getContentPane(); • c.setLayout(new FlowLayout());
• c.add(b1); • c.add(b2); • c.add(text = new JTextField(20)); • } • public void actionPerformed(ActionEvent ae) • { • if(ae.getSource()==b1) • text.setText(b1.getText()); • else • text.setText(b2.getText()); • } • } • public class radiobutton2 • { • public static void main(String []a) • { radiobutton r=new radiobutton(); • r.setSize(300,400); • r.setVisible(true); • }}
JComboBox • combo box • (a combination of a text field and a drop-down list) – Editable - setEditable(boolean) • A combo box normally displays one entry. • JComboBox( ) • JComboBox(Vector v) • void addItem(Object obj) • adds Items to the combo box
JComboBox • // Create a combo box • JComboBox jc = new JComboBox(); • jc.addItem("France"); • jc.addItem("Germany"); • jc.addItem("Italy"); • jc.addItem("Japan"); • jc.addItemListener(this);
or • String []s={"France", "Germany", "Italy","Japan"}; • JComboBox jc = new JComboBox(s);
• import javax.swing.*;import java.awt.event.*; • import java.awt.*; • class myframe extends JFrame implements ItemListener • {JTextField jtf; JCheckBox cb1,cb2,cb3; • public myframe() { • // Get content pane • Container c = getContentPane(); • c.setLayout(new FlowLayout()); • // Create icons • JComboBox jc = new JComboBox(); • jc.addItem("France"); • jc.addItem("Germany"); • jc.addItem("Italy"); • jc.addItem("Japan"); • jc.addItemListener(this); • c.add(jc); • // Add text field to the content pane • jtf = new JTextField(15); • c.add(jtf); • }
• public void itemStateChanged(ItemEvent ie) • { • jtf.setText((String)ie.getItem()); • } • } • public class comboboxdemo1 • { • public static void main(String[] args) { • myframe frame = new myframe(); • frame.setSize(400,400); • frame.setVisible(true); • } • }
• //textfield demo • import javax.swing.*;//import java.applet.*;import java.awt.*;import java.awt.event.*; • class myframe1 extends JFrame implements ActionListener • { • JLabel l1,l2,l3,l4,l5; • JTextField t1,t2,t3,t4,t5; • JButton b1; • JRadioButton rb1,rb2; • ButtonGroup bg; • public myframe1() • {Container c=getContentPane(); • //create labels • l1=new JLabel("Name"); • l2=new JLabel("DOB"); • l3=new JLabel("Gender"); • l4=new JLabel("Address"); • l5=new JLabel("Phone"); • //creates textfield • //JTextField(int length) • t1=new JTextField(12); • t2=new JTextField(12); • bg=new ButtonGroup();// create button group • rb1=new JRadioButton("Male"); • rb2=new JRadioButton("Female");
• bg.add(rb1); • bg.add(rb2); • String []s={"France", "Germany", "Italy","Japan"}; • JComboBox jc = new JComboBox(s); • t4=new JTextField(12); • t5=new JTextField(12); • //t1.setHorizontalAlignment(JTextField.RIGHT); • //add action listenter • b1=new JButton("SUBMIT"); • // JTextField(String s,int length) • //set layout • c.setLayout(new FlowLayout(FlowLayout.LEFT)); • c.add(new JLabel("RESUME")); • c.add(new JLabel("")); • c.add(l1); • c.add(t1); • c.add(l2); • c.add(t2);
• c.add(l3); • c.add(rb1); • c.add(rb2); • c.add(l4); • c.add(jc); • c.add(l5); • c.add(t5); • c.add(b1); • } • public void actionPerformed(ActionEvent ae) • {} • } • public class allcompnts2 • { • public static void main(String []a) • { • myframe1 f=new myframe1(); • f.setSize(300,300); • f.setVisible(true); • }}
48 Simple GUI-Based Input/Output with JOptionPane • Dialog boxes – Used by applications to interact with the user – Provided by Java’s JOptionPane class • Contains input dialogs and message dialogs
1 // Fig. 11.2: Addition.java 2 // Addition program that uses JOptionPane for input and output. 3 import javax.swing.JOptionPane; // program uses JOptionPane 4 5 public class Addition 6 { 7 public static void main( String args[] ) 8 { 9 // obtain user input from JOptionPane input dialogs 10 String firstNumber = 11 JOptionPane.showInputDialog( "Enter first integer" ); 12 String secondNumber = 13 JOptionPane.showInputDialog( "Enter second integer" ); 14 15 // convert String inputs to int values for use in a calculation 16 int number1 = Integer.parseInt( firstNumber ); 17 int number2 = Integer.parseInt( secondNumber ); 18 19 int sum = number1 + number2; // add numbers 20 21 // display result in a JOptionPane message dialog 22 JOptionPane.showMessageDialog( null, "The sum is " + sum, 23 "Sum of Two Integers", JOptionPane.PLAIN_MESSAGE ); 24 } // end method main 25 } // end class Addition Show input dialog to receive first integer Show input dialog to receive second integer Show message dialog to output sum to user
50 Input dialog displayed by lines 10–11 Input dialog displayed by lines 12–13 Message dialog displayed by lines 22–23 Text field in which the user types a value Prompt to the user When the user clicks OK, showInputDialog returns to the program the 100 typed by the user as a String. The program must convert the String to an int title bar When the user clicks OK, the message dialog is dismissed (removed from the screen)
51 | JOptionPane static constants for message dialogs. Message dialog type Icon Description ERROR_MESSAGE A dialog that indicates an error to the user. INFORMATION_MESSAGE A dialog with an informational message to the user. WARNING_MESSAGE A dialog warning the user of a potential problem. QUESTION_MESSAGE A dialog that poses a question to the user. This dialog normally requires a response, such as clicking a Yes or a No button. PLAIN_MESSAGE no icon A dialog that contains a message, but no icon.
• import java.awt.*; • class SampleFrame extends Frame { • SampleFrame(String title) { • super(title); • } • } • // Create frame window. • class FD { • public static void main(String args[]) { • Frame f = new SampleFrame("File Dialog Demo"); • f.setVisible(true); • f.setSize(100, 100); • FileDialog fd = new FileDialog(f, "File Dialog"); • fd.setVisible(true); • } • }
FileDialog
JColorChooser • To Open a Color Palate – Call JColorChooser.showDialog • First argument: parent component • Second argument: title string • Third argument: initially-selected Color • Return value – Selected Color if "OK" chosen – null if "Cancel" chosen 54
JColorChooser Example • Button that lets you change color of window public void actionPerformed(ActionEvent e) { Color bgColor = JColorChooser.showDialog (this,"Choose Background Color", getBackground()); if (bgColor != null) setBackground(bgColor); } 55
JColorChooser Output 56
JTable • Is a user-interface component that presents data in a two-dimensional table format. • Displays a grid of data consisting of rows and columns similar to a spreadsheet. 57
Features of JTable • Reassessable and reorderable columns. • Cells that can be displayed using any components through the use of the Renderer interface. For example, cells can be equipped with Checkbox controls, choice controls, and so on. • Cells that can be edited using an editor interface. • Support for large data sets. 58
JTable Example Columns of a Table String[ ] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"}; Data to be displayed on the Table Object[][] data = { {"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)}, {"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)}, {"Kathy", "Walrath", "Knitting", new Integer(2), new Boolean(false)}, {"Sharon", "Zakhour", "Speed reading", new Integer(20), new Boolean(true)}, {"Philip", "Milne", "Pool", new Integer(10), new Boolean(false)} }; Constructing the Table JTable table = new JTable(data, columnNames); 59
Output of JTable 60
JTableModel • Every table object uses a table model object to manage the actual table data. A table model object must implement the TableModel interface. • If the programmer does not provide a table model object, JTable automatically creates an instance of DefaultTableModel 61
Test Your Understanding 1 The Java Swing provides the multiple platform independent APIs interfaces for interacting between the users and GUIs components a. true b. false • 2. All swing component classes are placed in a. java.awt b. javax.awt c. javax.swing d. java.swing 62
Test Your Understanding (Contd.) 3 In MVC pattern the controller contols a. the visual screen representation of a component b. the objects state c. a component in such a way that it responds to the user input d. the life cycle of an object 4. A vital part of Swing's pluggable L&F mechanism is a user- interface (UI) object called a______________ a. model b. object c. class d. delegate 63
Test Your Understanding (Contd.) 5. The root class of the swing components is a. JFrame class b. JPanel class c. JComponent class d. JWindow class 6.Cross platform look and feel is also known as: a. Metal b.System look and feel c.Windows look and feel d. Motif look and feel 64
Test Your Understanding (Contd.) 7. .Which component in swing represents data in rows and columns? a. JTextArea b. JTable c. JPanel c. JtabbedPane 8. Every table object uses a table model object to manage the actual table data a. true b. false 65
Test Your Understanding (Contd.) 9. Consider the following code and select the correct option String col[]={"FirstName","LastName","marks"};-----line1 Object [][]data={{"Mary","Adams",new Integer(90)}, {"Allen","Jones",new Integer(57)}};-----line 2 JTable table=new JTable(col,data); -----line 3 a. Compilation error at line 1 b. Compilation error at line 2 c. Compilation error at line 3 d. None of the above 66
Test Your Understanding (Contd.) 10. If the programmer does not provide a table model object, JTable automatically creates an instance of a. DefaultTableModel b. JTable c. JDefaultTableModel c. JTableModel 67

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swing_compo.pptxsfdsfffdfdfdfdgwrwrwwtry

  • 2.
    Container Classes 2 Dimension Font FontMetrics Component Graphics Object Color Container PanelApplet Frame Dialog Window JComponent JApplet JFrame JDialog Swing Components in the javax.swing package Lightweight Heavyweight Classes in the java.awt package 1 LayoutManager * JPanel Container classes can contain other GUI components.
  • 3.
    GUI Helper Classes 3 Thehelper classes are not subclasses of Component. They are used to describe the properties of GUI components such as graphics context, colors, fonts, and dimension. Dimension Font FontMetrics Component Graphics Object Color Container Panel Applet Frame Dialog Window JComponent JApplet JFrame JDialog Swing Components in the javax.swing package Lightweight Heavyweight Classes in the java.awt package 1 LayoutManager * JPanel
  • 4.
    Swing GUI Components 4 JMenuItem JCheckBoxMenuItem AbstractButton JComponent JMenu JRadioButtonMenuItem JToggleButtonJCheckBox JRadioButton JComboBox JInternalFrame JLayeredPane JList JMenuBar JOptionPane JPopupMenu JProgressBar JFileChooser JScrollBar JScrollPane JSeparator JSplitPane JSlider JTabbedPane JTable JTableHeader JTextField JTextComponent JTextArea JToolBar JToolTip JTree JRootPane JPanel JPasswordField JColorChooser JLabel JEditorPane JSpinner JButton
  • 5.
    Components Covered inthe Core Version 5 JMenuItem JCheckBoxMenuItem AbstractButton JComponent JMenu JRadioButtonMenuItem JToggleButton JCheckBox JRadioButton JComboBox JInternalFrame JLayeredPane JList JMenuBar JOptionPane JPopupMenu JProgressBar JFileChooser JScrollBar JScrollPane JSeparator JSplitPane JSlider JTabbedPane JTable JTableHeader JTextField JTextComponent JTextArea JToolBar JToolTip JTree JRootPane JPanel JPasswordField JColorChooser JLabel JEditorPane JSpinner JButton
  • 6.
    Components Covered inthe Comprehensive Version 6 JMenuItem JCheckBoxMenuItem AbstractButton JComponent JMenu JRadioButtonMenuItem JToggleButton JCheckBox JRadioButton JComboBox JInternalFrame JLayeredPane JList JMenuBar JOptionPane JPopupMenu JProgressBar JFileChooser JScrollBar JScrollPane JSeparator JSplitPane JSlider JTabbedPane JTable JTableHeader JTextField JTextComponent JTextArea JToolBar JToolTip JTree JRootPane JPanel JPasswordField JColorChooser JLabel JEditorPane JSpinner JButton
  • 7.
    AWT (Optional) 7 AWTEvent Font FontMetrics Component Graphics Object Color Canvas Button TextComponent Label List CheckBoxGroup CheckBox Choice ContainerPanel Applet Frame Dialog FileDialog Window TextField TextArea MenuComponent MenuItem MenuBar Menu Scrollbar LayoutManager
  • 8.
    Adding Components intoa Frame 8 // Add a button into the frame frame.getContentPane().add( new JButton("OK")); Run MyFrameWithComponents Title bar Content pane
  • 9.
    Content Pane Delegationin JDK 1.5 9 // Add a button into the frame frame.getContentPane().add( new JButton("OK")); Run MyFrameWithComponents Title bar Content pane // Add a button into the frame frame.add( new JButton("OK"));
  • 10.
    JFrame Class 10 javax.swing.JFrame +JFrame() +JFrame(title: String) +getSize(width:int, height: int): void +setLocation(x: int, y: int): void +setVisible(visible: boolean): void +setDefaultCloseOperation(mode: int): void +setLocationRelativeTo (c: Component): void Creates a default frame with no title. Creates a frame with the specified title. Specifies the size of the frame. Specifies the upper-left corner location of the frame. Sets true to display the frame. Specifies the operation when the frame is closed. Sets the location of the frame relative to the specified component. If the component is null, the frame is centered on the screen.
  • 11.
    JFrame example • Aprogram that sets several properties of the JFrame: import java.awt.*; import javax.swing.*; public class SimpleFrame2 { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setForeground(Color.WHITE); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocation(new Point(10, 50)); frame.setSize(new Dimension(300, 120)); frame.setTitle("A frame"); frame.setVisible(true); } } • Graphical output: 11
  • 12.
    JFrame properties • JFrameshave the following unique properties that you can get or set in your graphical programs: 12 name type description methods default close operation int what should happen when frame is closed getDefaultCloseOperation, setDefaultCloseOperation icon image Image icon in the window's title bar getIconImage, setIconImage layout LayoutManager how the frame should position its components getLayout, setLayout resizable boolean whether the window can be resized isResizable, setResizable title String window's title bar text getTitle, setTitle
  • 13.
    Component properties • Allcomponents also have the following properties: 13 name type description methods background Color background color getBackground, setBackground enabled boolean whether the component can be interacted with isEnabled, setEnabled font Font font used to display any text on the component getFont, setFont foreground Color foreground color getForeground, setForeground location Point (x, y) position of component on screen getLocation, setLocation size Dimension width, height of component getSize, setSize preferred size Dimension width, height that the component wants to be getPreferredSize, setPreferredSize visible boolean whether the component can be seen on screen isVisible, setVisible
  • 14.
    JButton • you canassociate an icon with a Swing button. • you can define different icons that are displayed for the component when it is disabled, pressed, or selected. • Another icon can be used as a rollover icon, • which is displayed when the mouse is positioned over that component.
  • 15.
    JButton • Swing buttonsare subclasses of the AbstractButton class,
  • 16.
    The JButton Class The JButton class provides the functionality of a push button.  JButton allows an icon, a string, or both to be associated with the push button.  JButton() // without text/icon  JButton(Icon i) // with icon  JButton(String s) // with text  JButton(String s, Icon i) // with text and icon  Here, s and i are the string and icon used for the button.
  • 17.
    JButton • The textassociated with a button can be read and written via the following methods: • String getText( ) • void setText(String s) • Here, s is the text to be associated with the button.
  • 18.
    • import javax.swing.*; •public class ButtonExample{ • ButtonExample(){ • JFrame f=new JFrame("Button Example"); • JButton b=new JButton(new ImageIcon("D:icon.png")); • b.setBounds(100,100,100, 40); • f.add(b); • f.setSize(300,400); • f.setLayout(null); • f.setVisible(true); • f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); • } • public static void main(String[] args) { • new ButtonExample(); • } • }
  • 19.
    JLabel • import javax.swing.*; •class LabelExample • { • public static void main(String args[]) • { • JFrame f= new JFrame("Label Example"); • JLabel l1,l2; • l1=new JLabel("First Label."); • l1.setBounds(50,50, 100,30); • l2=new JLabel("Second Label."); • l2.setBounds(50,100, 100,30); • f.add(l1); f.add(l2); • f.setSize(300,300); • f.setLayout(null); • f.setVisible(true); • } • }
  • 20.
    JCheckBox • If userneed some way to select multiple options from many options then checkbox is useful • JCheckBox class has some advantages over awt checkbox class • Able to display images
  • 21.
    JCheckBox • The JCheckBoxclass, which provides the functionality of a check box, • JCheckBox(Icon i) • JCheckBox(Icon i, boolean state) • JCheckBox(String s) • JCheckBox(String s, boolean state) • JCheckBox(String s, Icon i) • JCheckBox(String s, Icon i, boolean state) • If state is true, • the check box is initially selected. • Otherwise, it is not.
  • 22.
    • import java.awt.*;importjavax.swing.*; • class checkbox1 extends JFrame • { JCheckBox check1, check2, check3, check4; • JTextField text; • public checkbox1() • { Container contentPane = getContentPane(); • contentPane.setLayout(new FlowLayout()); • check1 = new JCheckBox("check 1",new ImageIcon("HELP.gif")); • check2 = new JCheckBox("Check 2",true); • check3 = new JCheckBox(new ImageIcon("palette_draw.gif")); • check4 = new JCheckBox("Check 4"); • contentPane.add(check1); • contentPane.add(check2); • contentPane.add(check3); • contentPane.add(check4); • text = new JTextField(20); • contentPane.add(text); • } } • public class checkboxdemo1 • {public static void main(String []a) • checkbox1 cb1=new checkbox1(); • cb1.setSize(300,400); • cb1.setVisible(true); • }}
  • 24.
    • void setSelected(booleanstate) • The state of the check box can be changed • state is true if the check box should be checked. • String getLabel() gets the label • boolean isSelected() • determine whether selected or deselected • When a check box is selected or deselected, an item event is generated. • This is handled by itemStateChanged( ). • the getItem( ) method gets the JCheckBox object that generated the event. • The getText( ) method gets the text for that check box and uses it to set the text inside the text field.
  • 25.
    • import javax.swing.*;import java.awt.event.*; import java.awt.*; • class myframe extends JFrame implements ItemListener { • JTextField jtf; JCheckBox cb1,cb2,cb3; • public myframe() { • // Get content pane • Container c = getContentPane(); • c.setLayout(new FlowLayout()); • // Create icons • ImageIcon normal = new ImageIcon("normal.gif"); • // Add check boxes to the content pane • cb1= new JCheckBox("C", normal); • cb1.addItemListener(this); • c.add(cb1); • cb2= new JCheckBox("C++"); • cb2.addItemListener(this); • c.add(cb2); • cb3= new JCheckBox("Java"); • cb3.addItemListener(this); • c.add(cb3); • // Add text field to the content pane • jtf = new JTextField(15); • c.add(jtf); }
  • 26.
    • public voiditemStateChanged(ItemEvent ie) • { • if(ie.getItem()==cb1) • jtf.setText(cb1.getText()); • if(ie.getItem()==cb2) • jtf.setText(cb2.getText()); • if(ie.getItem()==cb3) • jtf.setText(cb3.getText()); • } • } • public class checkboxdemo1 • { • public static void main(String[] args) { • myframe frame = new myframe(); • frame.setSize(400,400); • frame.setVisible(true); • } • }
  • 28.
    JRadioButton • If userneed some way to select only one options from many options • Then JRadioButton is used class has some advantages over awt checkbox class • Able to display images
  • 29.
    JRadioButton • JRadioButton(Icon i) •JRadioButton(Icon i, boolean state) • JRadioButton(String s) • JRadioButton(String s, boolean state) • JRadioButton(String s, Icon i) • JRadioButton(String s, Icon i, boolean state) • If state is true, the button is initially selected. Otherwise, it is not.
  • 30.
    • Container c=getContentPane(); •JRadioButton rb1 = new JRadioButton("C"); • JRadioButton rb2 = new JRadioButton(“java”); • c.add(rb1); • c.add(rb2); • Radio buttons must be configured into a group. • Only one of the buttons in that group can be selected at any time. • ButtonGroup bg = new ButtonGroup(); • bg.add(rb1); • bg.add(rb2);
  • 31.
    JRadioButton • JRadioButton rb1= new JRadioButton("A"); • c.add(rb1); • JRadioButton rb2 = new JRadioButton("B"); • c.add(rb2); • JRadioButton rb3 = new JRadioButton("C"); • c.add(rb3); • ButtonGroup bg = new ButtonGroup(); • bg.add(rb1); • bg.add(rb2); • bg.add(rb3);
  • 32.
    • import java.awt.*;importjavax.swing.*; • class radiobutton extends JFrame • { • JRadioButton b1,b2,b3,b4; • ButtonGroup bg; • JLabel l1; • Container c; • public radiobutton() • {bg=new ButtonGroup(); • b1=new JRadioButton("win98"); • b2=new JRadioButton("winxp"); • b3=new JRadioButton("linux"); • b4=new JRadioButton("win2k3"); • bg.add(b1); • bg.add(b2); • bg.add(b3); • bg.add(b4); • b4.setVerticalTextPosition(SwingConstants.BOTTOM); • b4.setHorizontalTextPosition(SwingConstants.CENTER);
  • 33.
    • c=getContentPane(); • c.setLayout(newFlowLayout()); • c.add(b1); • c.add(b2); • c.add(b3); • c.add(b4); • c.add(l1=new JLabel("")); • } • } • public class radiobutton1 • {public static void main(String []a) • { • radiobutton r=new radiobutton(); • r.setSize(300,400); • r.setVisible(true); • }}
  • 35.
    • import java.awt.*;importjavax.swing.*; • import java.awt.event.*; • class radiobutton extends JFrame implements ActionListener • { • JRadioButton b1,b2,b3,b4; • ButtonGroup bg; • Container c; • JTextField text; • public radiobutton() • { bg=new ButtonGroup(); • b1=new JRadioButton("win98"); • b2=new JRadioButton("winxp"); • b1.addActionListener(this); • b2.addActionListener(this); • bg.add(b1); • bg.add(b2); • c=getContentPane(); • c.setLayout(new FlowLayout());
  • 36.
    • c.add(b1); • c.add(b2); •c.add(text = new JTextField(20)); • } • public void actionPerformed(ActionEvent ae) • { • if(ae.getSource()==b1) • text.setText(b1.getText()); • else • text.setText(b2.getText()); • } • } • public class radiobutton2 • { • public static void main(String []a) • { radiobutton r=new radiobutton(); • r.setSize(300,400); • r.setVisible(true); • }}
  • 38.
    JComboBox • combo box •(a combination of a text field and a drop-down list) – Editable - setEditable(boolean) • A combo box normally displays one entry. • JComboBox( ) • JComboBox(Vector v) • void addItem(Object obj) • adds Items to the combo box
  • 39.
    JComboBox • // Createa combo box • JComboBox jc = new JComboBox(); • jc.addItem("France"); • jc.addItem("Germany"); • jc.addItem("Italy"); • jc.addItem("Japan"); • jc.addItemListener(this);
  • 40.
    or • String []s={"France","Germany", "Italy","Japan"}; • JComboBox jc = new JComboBox(s);
  • 41.
    • import javax.swing.*;importjava.awt.event.*; • import java.awt.*; • class myframe extends JFrame implements ItemListener • {JTextField jtf; JCheckBox cb1,cb2,cb3; • public myframe() { • // Get content pane • Container c = getContentPane(); • c.setLayout(new FlowLayout()); • // Create icons • JComboBox jc = new JComboBox(); • jc.addItem("France"); • jc.addItem("Germany"); • jc.addItem("Italy"); • jc.addItem("Japan"); • jc.addItemListener(this); • c.add(jc); • // Add text field to the content pane • jtf = new JTextField(15); • c.add(jtf); • }
  • 42.
    • public voiditemStateChanged(ItemEvent ie) • { • jtf.setText((String)ie.getItem()); • } • } • public class comboboxdemo1 • { • public static void main(String[] args) { • myframe frame = new myframe(); • frame.setSize(400,400); • frame.setVisible(true); • } • }
  • 44.
    • //textfield demo •import javax.swing.*;//import java.applet.*;import java.awt.*;import java.awt.event.*; • class myframe1 extends JFrame implements ActionListener • { • JLabel l1,l2,l3,l4,l5; • JTextField t1,t2,t3,t4,t5; • JButton b1; • JRadioButton rb1,rb2; • ButtonGroup bg; • public myframe1() • {Container c=getContentPane(); • //create labels • l1=new JLabel("Name"); • l2=new JLabel("DOB"); • l3=new JLabel("Gender"); • l4=new JLabel("Address"); • l5=new JLabel("Phone"); • //creates textfield • //JTextField(int length) • t1=new JTextField(12); • t2=new JTextField(12); • bg=new ButtonGroup();// create button group • rb1=new JRadioButton("Male"); • rb2=new JRadioButton("Female");
  • 45.
    • bg.add(rb1); • bg.add(rb2); •String []s={"France", "Germany", "Italy","Japan"}; • JComboBox jc = new JComboBox(s); • t4=new JTextField(12); • t5=new JTextField(12); • //t1.setHorizontalAlignment(JTextField.RIGHT); • //add action listenter • b1=new JButton("SUBMIT"); • // JTextField(String s,int length) • //set layout • c.setLayout(new FlowLayout(FlowLayout.LEFT)); • c.add(new JLabel("RESUME")); • c.add(new JLabel("")); • c.add(l1); • c.add(t1); • c.add(l2); • c.add(t2);
  • 46.
    • c.add(l3); • c.add(rb1); •c.add(rb2); • c.add(l4); • c.add(jc); • c.add(l5); • c.add(t5); • c.add(b1); • } • public void actionPerformed(ActionEvent ae) • {} • } • public class allcompnts2 • { • public static void main(String []a) • { • myframe1 f=new myframe1(); • f.setSize(300,300); • f.setVisible(true); • }}
  • 48.
    48 Simple GUI-Based Input/Outputwith JOptionPane • Dialog boxes – Used by applications to interact with the user – Provided by Java’s JOptionPane class • Contains input dialogs and message dialogs
  • 49.
    1 // Fig.11.2: Addition.java 2 // Addition program that uses JOptionPane for input and output. 3 import javax.swing.JOptionPane; // program uses JOptionPane 4 5 public class Addition 6 { 7 public static void main( String args[] ) 8 { 9 // obtain user input from JOptionPane input dialogs 10 String firstNumber = 11 JOptionPane.showInputDialog( "Enter first integer" ); 12 String secondNumber = 13 JOptionPane.showInputDialog( "Enter second integer" ); 14 15 // convert String inputs to int values for use in a calculation 16 int number1 = Integer.parseInt( firstNumber ); 17 int number2 = Integer.parseInt( secondNumber ); 18 19 int sum = number1 + number2; // add numbers 20 21 // display result in a JOptionPane message dialog 22 JOptionPane.showMessageDialog( null, "The sum is " + sum, 23 "Sum of Two Integers", JOptionPane.PLAIN_MESSAGE ); 24 } // end method main 25 } // end class Addition Show input dialog to receive first integer Show input dialog to receive second integer Show message dialog to output sum to user
  • 50.
    50 Input dialog displayedby lines 10–11 Input dialog displayed by lines 12–13 Message dialog displayed by lines 22–23 Text field in which the user types a value Prompt to the user When the user clicks OK, showInputDialog returns to the program the 100 typed by the user as a String. The program must convert the String to an int title bar When the user clicks OK, the message dialog is dismissed (removed from the screen)
  • 51.
    51 | JOptionPane staticconstants for message dialogs. Message dialog type Icon Description ERROR_MESSAGE A dialog that indicates an error to the user. INFORMATION_MESSAGE A dialog with an informational message to the user. WARNING_MESSAGE A dialog warning the user of a potential problem. QUESTION_MESSAGE A dialog that poses a question to the user. This dialog normally requires a response, such as clicking a Yes or a No button. PLAIN_MESSAGE no icon A dialog that contains a message, but no icon.
  • 52.
    • import java.awt.*; •class SampleFrame extends Frame { • SampleFrame(String title) { • super(title); • } • } • // Create frame window. • class FD { • public static void main(String args[]) { • Frame f = new SampleFrame("File Dialog Demo"); • f.setVisible(true); • f.setSize(100, 100); • FileDialog fd = new FileDialog(f, "File Dialog"); • fd.setVisible(true); • } • }
  • 53.
  • 54.
    JColorChooser • To Opena Color Palate – Call JColorChooser.showDialog • First argument: parent component • Second argument: title string • Third argument: initially-selected Color • Return value – Selected Color if "OK" chosen – null if "Cancel" chosen 54
  • 55.
    JColorChooser Example • Buttonthat lets you change color of window public void actionPerformed(ActionEvent e) { Color bgColor = JColorChooser.showDialog (this,"Choose Background Color", getBackground()); if (bgColor != null) setBackground(bgColor); } 55
  • 56.
  • 57.
    JTable • Is auser-interface component that presents data in a two-dimensional table format. • Displays a grid of data consisting of rows and columns similar to a spreadsheet. 57
  • 58.
    Features of JTable •Reassessable and reorderable columns. • Cells that can be displayed using any components through the use of the Renderer interface. For example, cells can be equipped with Checkbox controls, choice controls, and so on. • Cells that can be edited using an editor interface. • Support for large data sets. 58
  • 59.
    JTable Example Columns ofa Table String[ ] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"}; Data to be displayed on the Table Object[][] data = { {"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)}, {"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)}, {"Kathy", "Walrath", "Knitting", new Integer(2), new Boolean(false)}, {"Sharon", "Zakhour", "Speed reading", new Integer(20), new Boolean(true)}, {"Philip", "Milne", "Pool", new Integer(10), new Boolean(false)} }; Constructing the Table JTable table = new JTable(data, columnNames); 59
  • 60.
  • 61.
    JTableModel • Every tableobject uses a table model object to manage the actual table data. A table model object must implement the TableModel interface. • If the programmer does not provide a table model object, JTable automatically creates an instance of DefaultTableModel 61
  • 62.
    Test Your Understanding 1The Java Swing provides the multiple platform independent APIs interfaces for interacting between the users and GUIs components a. true b. false • 2. All swing component classes are placed in a. java.awt b. javax.awt c. javax.swing d. java.swing 62
  • 63.
    Test Your Understanding(Contd.) 3 In MVC pattern the controller contols a. the visual screen representation of a component b. the objects state c. a component in such a way that it responds to the user input d. the life cycle of an object 4. A vital part of Swing's pluggable L&F mechanism is a user- interface (UI) object called a______________ a. model b. object c. class d. delegate 63
  • 64.
    Test Your Understanding(Contd.) 5. The root class of the swing components is a. JFrame class b. JPanel class c. JComponent class d. JWindow class 6.Cross platform look and feel is also known as: a. Metal b.System look and feel c.Windows look and feel d. Motif look and feel 64
  • 65.
    Test Your Understanding(Contd.) 7. .Which component in swing represents data in rows and columns? a. JTextArea b. JTable c. JPanel c. JtabbedPane 8. Every table object uses a table model object to manage the actual table data a. true b. false 65
  • 66.
    Test Your Understanding(Contd.) 9. Consider the following code and select the correct option String col[]={"FirstName","LastName","marks"};-----line1 Object [][]data={{"Mary","Adams",new Integer(90)}, {"Allen","Jones",new Integer(57)}};-----line 2 JTable table=new JTable(col,data); -----line 3 a. Compilation error at line 1 b. Compilation error at line 2 c. Compilation error at line 3 d. None of the above 66
  • 67.
    Test Your Understanding(Contd.) 10. If the programmer does not provide a table model object, JTable automatically creates an instance of a. DefaultTableModel b. JTable c. JDefaultTableModel c. JTableModel 67

Editor's Notes

  • #55 Assuming that a frame consist of a button, which when clicked will allow a user to choose a color and will be applied to the background of the frame
  • #57 The JTable class is NOT a spreadsheet, but it supports many features that make it superior to a simple spreadsheet component.
  • #58 With the help of JDBC, the database-interface mechanism that is designed to be used with JFC, tables implemented using JTable are automatically database-connectable; that is, they can access and manipulate data stored in relational databases.
  • #59 A Table has to be added to a ScrollPane container or else the table columns will not be visible. The Scroll pane is then added to the Frame or Applet There are two JTable constructors that directly accept data (SimpleTableDemo uses the first): JTable(Object[][] rowData, Object[] columnNames) JTable(Vector rowData, Vector columnNames)
  • #61 One can make a Custom TableModel by extending the AbstractTableModel and overriding the methods as required by the Application. Then a JTable can be created by passing the Custom TableModel as a parameter while constructing the JTable Eg Class MyTableModel extends AbstractTableModel {private String[] column names; private Object[][] data; Override methods; } JTable jt=new JTable(new MyTable());