ADVANCED JAVA PROGRAMME

NADAR SARASWATHI COLLEGE OF ARTS&SCIENCE,THENI
DEPARTMENT OF COMPUTER SCIENCE&INFORMATION
TECHOLOGY
R.RAMYA DEVI
I-MSC(CS)

ADVANCED JAVA PROGRAMMING
Topic: Border Layout

LAYOUT MANAGER
Java LayoutManagers:
 The LayoutManagers are used to arrange components in a
particular manner. The Java LayoutManagers facilitates us to
control the positioning and size of the components in GUI
forms. LayoutManager is an interface that is implemented by
all the classes of layout managers. There are the following
classes that represent the layout managers:

LAYOUT MANAGER TYPES
 java.awt.BorderLayout
 java.awt.FlowLayout
 java.awt.GridLayout
 java.awt.CardLayout
 java.awt.GridBagLayout
 javax.swing.BoxLayout
 javax.swing.GroupLayout
 javax.swing.ScrollPaneLayout
 javax.swing.SpringLayout etc.

BORDER LAYOUT
Java BorderLayout:
 The BorderLayout is used to arrange the components in
five regions: north, south, east, west, and center. Each
region (area) may contain one component only. It is the
default layout of a frame or window. The BorderLayout
provides five constants for each region:
 public static final int NORTH
 public static final int SOUTH
 public static final int EAST
 public static final int WEST
 public static final int CENTER

Constructors of BorderLayout class:
 BorderLayout(): creates a border layout but with
no gaps between the components.
 BorderLayout(int hgap, int vgap): creates a
border layout with the given horizontal and vertical
gaps between the components.

EXAMPLE 1
Example of BorderLayout class: Using
BorderLayout() constructor
FileName: Border.java
import java.awt.*;
import javax.swing.*;
public class Border
{
JFrame f;
Border()
{
f = new JFrame();

// creating buttons
JButton b1 = new JButton("NORTH");
// the but on will be labeled as NORTH
JButton b2 = new JButton("SOUTH");
// the button will be labeled as SOUTH
JButton b3 = new JButton("EAST");
// the button will be labeled as EAST
JButton b4 = new JButton("WEST");
// the button will be labeled as WEST
JButton b5 = new JButton("CENTER“);
// the button will be labeled as CENTER

f.add(b1, BorderLayout.NORTH); // b1 will be placed
in the North Direction
f.add(b2, BorderLayout.SOUTH); // b2 will be placed
in the South Direction
f.add(b3, BorderLayout.EAST); // b2 will be
placed in the East Direction
f.add(b4, BorderLayout.WEST); // b2 will be
placed in the West Direction
f.add(b5, BorderLayout.CENTER); // b2 will be place
d in the Center

f.setSize(300, 300);
f.setVisible(true);
}
public static void main(String[] args)
{
new Border();
}
}

EXAMPLE 2
Example of BorderLayout class: Using
BorderLayout(int hgap, int vgap) constructor
The following example inserts horizontal and vertical
gaps between buttons using the parameterized
constructor BorderLayout(int hgap, int gap)
FileName: BorderLayoutExample.java

// import statement
import java.awt.*;
public class BorderLayoutExample
{
JFrame jframe;
// constructor
BorderLayoutExample()
{

// creating a Frame
jframe = new JFrame();
// create buttons
JButton btn1 = new JButton("NORTH");
JButton btn2 = new JButton("SOUTH");
JButton btn3 = new JButton("EAST");
JButton btn4 = new JButton("WEST");
JButton btn5 = new JButton("CENTER");

// creating an object of the BorderLayout class using
// the parameterized constructor where the horizontal gap is
20
// and vertical gap is 15. The gap will be evident when button
are placed
// in the frame
jframe.setLayout(new BorderLayout(20, 15));
jframe.add(btn1, BorderLayout.NORTH);
jframe.add(btn2, BorderLayout.SOUTH);
jframe.add(btn3, BorderLayout.EAST);
jframe.add(btn4, BorderLayout.WEST);
jframe.add(btn5, BorderLayout.CENTER);
jframe.setSize(300,300);
jframe.setVisible(true);
}

// main method
public static void main(String argvs[])
{
new BorderLayoutExample();
}
}

EXAMPLE 3
Java BorderLayout:
The add() method of the JFrame class can work even
when we do not specify the region. In such a case,
only the latest component added is shown in the
frame, and all the components added previously get
discarded. The latest component covers the whole
area. The following example shows the same.
FileName: BorderLayoutWithoutRegionExample.java

// import statements
import java.awt.*;
public class BorderLayoutWithoutRegionExample
{
JFrame jframe;
// constructor
BorderLayoutWithoutRegionExample()
{

jframe = new JFrame();
JButton btn1 = new JButton("NORTH");
JButton btn2 = new JButton("SOUTH");
JButton btn3 = new JButton("EAST");
JButton btn4 = new JButton("WEST");
JButton btn5 = new JButton("CENTER");
// horizontal gap is 7, and the vertical gap is 7
// Since region is not specified, the gaps are of no us
jframe.setLayout(new BorderLayout(7, 7));

// each button covers the whole area
// however, the btn5 is the latest button
// that is added to the frame; therefore, btn5
// is shown
jframe.add(btn1);
jframe.add(btn2);
jframe.add(btn3);
jframe.add(btn4);
jframe.add(btn5);
jframe.setSize(300,300);
jframe.setVisible(true);
}

// main method
public static void main(String argvs[])
{
new BorderLayoutWithoutRegion
Example();
}
}

ADVANCED JAVA PROGRAMME

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