The document discusses different layout managers in Java including FlowLayout, BorderLayout, and GridLayout. It also discusses using panels as containers. Specifically: 1) FlowLayout arranges components from left to right in the order they are added and wraps to the next line when no more space on current line. 2) BorderLayout divides the container into five regions (north, south, east, west, center) with different expansion behaviors. 3) GridLayout places components into an equal-sized grid with a fixed number of rows and columns. 4) Panels can be used as containers within frames to group and layout components, with different panels using different layouts and the panels arranged within the frame

1. LAYOUT MANAGER
Chapter 11.3:

2. Layout Managers
 The layout manager determines how the GUI
components are added to the container (such as
the content pane of a frame)
 Layout managers are set in containers using the
setLayout(LayoutManager) method in a container

3. FlowLayout
 In using this layout, GUI components
are placed in left-to-right order.
 When the component does not fit on the
same line, left-to-right placement continues
on the next line.
 As a default, components on each line
are centered.
 When the frame containing the
component is resized, the placement of
components is adjusted accordingly.

4. FlowLayout Sample
This shows
the placement
of five buttons
by using
FlowLayout.

5. FlowLayout
 The components are arranged
in the container from left to
right in the order in which they
were added.
 When one row becomes filled,
a new row is started.
 FlowLayout can be aligned in 3
ways:
FlowLayout.LEFT – left aligned
FlowLayout.RIGHT – right aligned
FlowLayout.CENTER – center aligned

6. FlowLayout Constructors
 public FlowLayout(int align, int hGap,
int vGap)
Constructs a new FlowLayout with a specified alignment,
horizontal gap, and vertical gap. The gaps are the distances in
pixel between components.
 public FlowLayout(int alignment)
Constructs a new FlowLayout with a specified alignment and a
default gap of five pixels for both horizontal and vertical.
 public FlowLayout()
Constructs a new FlowLayout with a default center alignment
and a default gap of five pixels for both horizontal and vertical.

7. import java.awt.*;
import javax.swing.*;
//import java.awt.event.*;
public class TestFlowLayout extends JFrame
{
public TestFlowLayout()
{
super(“Using flowLayout");
Container cpane = getContentPane();
cpane.setLayout(new FlowLayout(FlowLayout.LEFT,20,10));
for (int i=1; i<7;i++)
cpane.add(new JButton("button "+i));
setSize(300,200);
setVisible(true);
}
public static void main(String[] arg)
{
TestFlowLayout teks = new TestFlowLayout();
teks.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
10
20

8. BorderLayout
 This layout manager divides the container into five
regions: center, north, south, east, and west.
 The north and south regions expand or shrink in
width only
 The east and west regions expand or shrink in
height only
 The center region expands or shrinks on both
height and width.
 Not all regions have to be occupied.

9. BorderLayout Sample

10. GridLayout
 This layout manager placesGUI components on
equal-size N by M grids.
 Components are placed in top-to-bottom, left-to-
right order.
 The number of rows and columns remains the
same after the frame is resized, but the width and
height of each region will change.

11. GridLayout Sample

12. Using Panels as Containers
 Panels act as smaller containers for grouping user
interface components.
 It is recommended that you place the user
interface components in panels and place the
panels in a frame. You can also place panels in a
panel.
 To add a component to JFrame, you actually add it
to the content pane of JFrame. To add a
component to a panel, you add it directly to the
panel using the add method.

13. Create a JPanel
example :
Container cpane = getContentPane();
JPanel pan = new JPanel(); // create a panel
pan.add(new JButton(“Click”)); // add a button in the panel
cpane.add(pan) // add the panel in the container

14. label TextField
Text Area
button button
There are 3 panels :
top panel – has 2 components that are label, textfield
- 2 components are arranged with flowLayout
middle panel – has a component: text area. It is arranged with Gridlayout
bottom panel – has 2 components that are buttons
- 2components are arranged with Flowlayout
All panels are arrranged with borderlayout
top panel –north middle panel –center bottom panel –South
Top
panel
Middle
panel
Bottom
panel

15. import java.awt.*;
import javax.swing.*;
public class UjiPanel extends JFrame
{
public UjiPanel()
{
super("Membuat BorderLayout");
Container bekas = getContentPane();
bekas.setLayout(new BorderLayout());
JPanel panelAtas = new JPanel();
bekas.add(panelAtas,BorderLayout.NORTH);
JLabel label = new JLabel("Nama");
JTextField txtField = new JTextField(10);
panelAtas.setLayout(new FlowLayout());
panelAtas.add(label);
panelAtas.add(txtField);
JPanel panelTengah = new JPanel();
bekas.add(panelTengah,BorderLayout.CENTER);
JTextArea txtArea = new JTextArea();
panelTengah.setLayout(new GridLayout());
panelTengah.add(txtArea);
JPanel panelBawah = new JPanel();
bekas.add(panelBawah,BorderLayout.SOUTH);
JButton btg1 = new JButton("Hantar");
JButton btg2 = new JButton("Batal");
btg2.setMnemonic('B');
panelBawah.setLayout(new FlowLayout());
panelBawah.add(btg1);
panelBawah.add(btg2);

16. setSize(300,200);
setVisible(true);
} // konstruktor
public static void main(String[] arg)
{
UjiPanel teks = new UjiPanel();
teks.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

17. Step in Creating Panel
 Set a layout manager for a container (frame).
 Create a panel
 Set a layout for the panel.
 Add the panel in the container (frame)
 Create a component that to be added in the panel
 Add the component in the panel