Sunday, October 21, 2012

Java program to illustrate swing concept


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class swing extends JFrame implements ActionListener,ItemListener
{JComboBox combo=new JComboBox();
  JButton btnExit=new JButton("Exit");
  Container cp=getContentPane();
  Color c=cp.getBackground();
  public swing()
  {        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setLayout(null);
            combo.addItem("Reset to Default Color");
            combo.addItem("Set background color to red");
            combo.addItem("Set background color to green");
            combo.addItem("Set background color to blue");
            cp.add(combo);
            cp.add(btnExit);
            btnExit.setBounds(85,120,70,30);
            combo.setBounds(20,10,200,30);
            combo.addItemListener(this);
            btnExit.addActionListener(this);
  }
public void itemStateChanged(ItemEvent e)
  {        String s=(String)e.getItem();
            if(s.compareTo("Reset to Default Color")==0)
            cp.setBackground(c);
            if(s.compareTo("Set background color to red")==0)
            cp.setBackground(Color.red);
            if(s.compareTo("Set background color to green")==0)
            cp.setBackground(Color.green);
            if(s.compareTo("Set background color to blue")==0)
            cp.setBackground(Color.blue);
  }
public void actionPerformed(ActionEvent a)
  {        String s=a.getActionCommand();
            if(s.equals("Exit"))
            System.exit(0);
  }
public static void main(String[]args)
{
            swing cd=new swing();
            cd.setSize(new Dimension(250,200));
            cd.setTitle("A swing application");
            cd.setVisible(true);
   }
 }
Output

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