Thread: need help for the few question for java program!!

i have some confuse this dew question!can you let me know how to solution this few question!thank you!!!pls refer the attachment!

1.jpg2.jpg

for q4!my program on below,cab you let me know why i click the button,why can not change the size?please help!!

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class tma2 {

public static void main(String[] args) {
JFrame jj=new JFrame("adjust");
int size=200;
JButton big=new JButton("BIG");
JButton small=new JButton("SMALL");
big.addActionListener(new ActionListener(){
protected int i=1;
public void actionPerformed(ActionEvent e)
{

System.out.println(i++);
}
});
small.addActionListener(new ActionListener(){
protected int j=20;
public void actionPerformed(ActionEvent e)
{

System.out.println(j++);
}
});
jj.addWindowListener(new WindowAdapter()
{
public void WindowClosing(WindowEvent e)
{
System.exit(0);
}
});
jj.getContentPane().add(big,"North");
jj.getContentPane().add(small,"South");
jj.setSize(size,size);
jj.setVisible(true);
}
}

please refer my attachment on below!

11.jpg

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class jframe {
 
  public static void main(String[] args) {
    JFrame jj=new JFrame("adjust");
 
     int i=200;
 
    JButton big=new JButton("BIG");
    JButton small=new JButton("SMALL");
    big.addActionListener(new ActionListener(){
 
      public void actionPerformed(ActionEvent e)
      {
 
        System.out.println(i++);
 
        }
    });
    small.addActionListener(new ActionListener(){
 
      public void actionPerformed(ActionEvent e)
      {
 
        System.out.println(i--);
      }
    });
    jj.addWindowListener(new WindowAdapter()
    {
      public void WindowClosing(WindowEvent e)
      {
        System.exit(0);
   }
   });  
    jj.getContentPane().add(big,"North");
    jj.getContentPane().add(small,"South");
    jj.setSize(i,i);
    jj.setVisible(true);
  }
}

for part a
You can change the size of a JFrame by using the setSize(int h, int v) method,where h and v give the horizontal and vertical dimensions of the applet’s window in pixels. Write a GUI application that contains two JButtons, labeled “Big” and “Small.” Whenever the user clicks on Small, set the applets dimensions to 200 x100, and whenever the user clicks on Big, set the dimensions to 300 x 200.
for part b
Rewrite your solution to the previous exercise so that it uses a single button, whose label is toggled appropriately each time it is clicked. Obviously, when the JButtonis labeled “Big,” clicking it should give the applet its big dimensions.