FocusEvent class and FocusListener interface in java

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 //FocusEvent class and FocusListener interface

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/*
<applet code = "FocusEvent_and_FocusListener"
width = 200 height = 200>
</applet>
*/

public class FocusEvent_and_FocusListener
extends JApplet implements FocusListener
{
    Container con;
    JTextField txt1, txt2, txt3;

    public void init()
    {
        con = getContentPane();
        con.setLayout(new FlowLayout());

        txt1 = new JTextField(20);
        txt1.addFocusListener(this);
        con.add(txt1);

        txt2 = new JTextField(20);
        txt2.addFocusListener(this);
        con.add(txt2);

        txt3 = new JTextField(20);
        txt3.addFocusListener(this);
        con.add(txt3);
    }
    public void focusGained(FocusEvent fe)
    {
        if(fe.getSource() == txt1)
            txt1.setBackground(Color.yellow);
        else if(fe.getSource() == txt2)
            txt2.setBackground(Color.yellow);
        else if(fe.getSource() == txt3)
            txt3.setBackground(Color.yellow);
    }
    public void focusLost(FocusEvent fe)
    {
        if(fe.getSource() == txt1)
            txt1.setBackground(Color.white);
        else if(fe.getSource() == txt2)
            txt2.setBackground(Color.white);
        else if(fe.getSource() == txt3)
            txt3.setBackground(Color.white);
    }
}

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