jframe, jtextarea and jscrollpane

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Topics
JFrame
JTextArea
JScrollPane
Lecture By:- Mr. Akaash

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Open NetBeans IDE 8.1

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Open File Menu

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Click on New Project

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Select Category “Java”

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Select Project Java Application

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Click on Next Button

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Write Project Name

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Create Main Class

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Click on Finish Button

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What is Jframe?
A frame, implemented as an instance of the JFrame
class, is a window that has decorations such as a
border, a title, and supports button components that
close or iconify the window. Applications with a GUI
usually include at least one frame

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Coding of JFrame
import java.awt.FlowLayout;
import javax.swing.JFrame;
public class JTextAreaTest {
public static void main(String[] args) {
JFrame frame = new JFrame("JTextArea Test");
frame.setSize(280, 150);
frame.setLayout(new FlowLayout());
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
Built_in Packages of Java
Programming Language

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Coding of JFrame
}
}
Main Class

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Coding of JFrame
}
}
Main Class
Main Function

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Coding of JFrame
}
}
Main Class
Main Function
Class

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Coding of JFrame
}
}
Main Class
Main Function
Class Object

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Coding of JFrame
}
}
Main Class
Main Function
Class Object Keyword

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Coding of JFrame
}
}
Main Class
Main Function
Class Object Keyword Constructor

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Coding of JFrame
}
}
Main Class
Main Function
Class Object Keyword Constructor Value

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Coding of JFrame
}
}
Object

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Coding of JFrame
}
}
Object Method

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Coding of JFrame
}
}
Object Method Width

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Coding of JFrame
}
}
Object Method Width Height

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Coding of JFrame
}
}
Object

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Coding of JFrame
}
}
Object Method

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Coding of JFrame
}
}
Object Method Keyword

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Coding of JFrame
}
}
Object Method Keyword Method

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Coding of JFrame
}
}
Object

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Coding of JFrame
}
}
Object Method

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Coding of JFrame
}
}
Object Method Boolean value

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Coding of JFrame
}
}
Object

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Coding of JFrame
}
}
Object Method

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Coding of JFrame
}
}
Object Method Class

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Coding of JFrame
}
}
Object Method Value Class Method

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Explanation of Previously Used
Methods
setSize(). Method allows you to set the size like Width & height of JFrame
setResizable(). One method for ensuring that a graphical interface looks the way you intend is
to prevent the user from re-sizing it, using this method of JFrame :
setLayout(). Method allows you to set the layout of the container, often a JPanel, to say
FlowLayout(), BorderLayout(), GridLayout(), null layout(), or
whatever layout desired. The layout manager helps lay out the components held
by this container
setDefaultCloseOperation() method is used to specify one of several options for the close
button. Use one of the following constants to specify your choice:
 JFrame.EXIT_ON_CLOSE — Exit the application.
 JFrame.HIDE_ON_CLOSE — Hide the frame, but keep the application running.
 JFrame.DISPOSE_ON_CLOSE — Dispose of the frame object, but keep the application running.
 JFrame.DO_NOTHING_ON_CLOSE — Ignore the click.
If you forget to call setDefaultCloseOperation() you will get JFrame.HIDE_ON_CLOSE by default.
This can be frustrating, because it looks like you have "killed" the program, but it keeps on running,
and you see no frame.

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What is JTextArea?
A JTextArea is a multi-line area that displays plain
text. It is intended to be a lightweight component that
provides source compatibility with the
java.awt.TextArea class where it can reasonably do
so.

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Add “JTextArea” on Frame

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Coding of JTextArea
JTextArea textArea1 = new JTextArea(text);
textArea1.setPreferredSize(new Dimension(100, 100));
textArea1.setLineWrap(true);
frame.add(textArea1);
Class Object Keyword Constructor Value
Object Method Keyword Method Width Height
Object Method Object

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Constructors and Description
JTextArea()
Constructs a new TextArea.
JTextArea(Document doc)
Constructs a new JTextArea with the given document model, and defaults for all of the other
arguments (null, 0, 0).
JTextArea(Document doc, String text, int rows, int columns)
Constructs a new JTextArea with the specified number of rows and columns, and the given model.
JTextArea(int rows, int columns)
Constructs a new empty TextArea with the specified number of rows and columns.
JTextArea(String text)
Constructs a new TextArea with the specified text displayed.
JTextArea(String text, int rows, int columns)
Constructs a new TextArea with the specified text and number of rows and columns.

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Methods
Modifier and Type Method and Description
void
append(String str)
Appends the given text to the end of the document.
protected
Document
createDefaultModel()
Creates the default implementation of the model to be used at
construction if one isn't explicitly given.
AccessibleContext
getAccessibleContext()
Gets the AccessibleContext associated with this JTextArea.
int
getColumns()
Returns the number of columns in the TextArea.
protected int
getColumnWidth()
Gets column width.
int
getLineCount()
Determines the number of lines contained in the area.
int
getLineEndOffset(int line)
Determines the offset of the end of the given line.

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Methods
Modifier and Type Method and Description
boolean
getLineWrap()
Gets the line-wrapping policy of the text area.
Dimension
getPreferredScrollableViewportSize()
Returns the preferred size of the viewport if this component is embedded in a
JScrollPane.
Dimension
getPreferredSize()
Returns the preferred size of the TextArea.
protected int
getRowHeight()
Defines the meaning of the height of a row.
int
getRows()
Returns the number of rows in the TextArea.
boolean
getScrollableTracksViewportWidth()
Returns true if a viewport should always force the width of this Scrollable to
match the width of the viewport.
int
getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction)
Components that display logical rows or columns should compute the scroll
increment that will completely expose one new row or column, depending on
the value of orientation.

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Methods
Modifier & Type Method and Description
Int getTabSize()
Gets the number of characters used to expand tabs.
String getUIClassID()
Returns the class ID for the UI.
Boolean getWrapStyleWord()
Gets the style of wrapping used if the text area is wrapping lines.
Void insert(String str, int pos)
Inserts the specified text at the specified position.
protected String paramString()
Returns a string representation of this JTextArea.
Void replaceRange(String str, int start, int end)
Replaces text from the indicated start to end position with the new
text specified.
Void setColumns(int columns)
Sets the number of columns for this TextArea.
Void setTabSize(int size)
Sets the number of characters to expand tabs to.
Void setWrapStyleWord(boolean word)
Sets the style of wrapping used if the text area is wrapping lines.

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Coding of JTextArea with
ScrollPane
JTextArea textArea2 = new JTextArea(text, 5, 10);
textArea2.setLineWrap(true);
JScrollPane scrollPane = new
JScrollPane(textArea2,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
frame.add(scrollPane);

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Why JScrollPane used with
JTextArea?
A JTextArea object represents a multiline area for displaying
text. If Text is too large from JTextArea Boundaries(Width,
Height) then You can also put your JTextArea in a
JScrollPane to make it scrollable.

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