14) The windows program that displays shapes on Canvas using Card Layout Manager

source file name:   CardLayoutDemo1.java

 import java.awt.*;  
import java.awt.event.*;  

class circle extends Canvas
{
  public circle() {  
        setBackground (Color.gray);  
        setSize(300, 200);  
}
public void paint(Graphics g)
{
g.setColor(Color.red);
g.fillOval(100,100,80,80);
}
}

class square extends Canvas
{
  public square() {  
        setBackground (Color.gray);  
        setSize(300, 200);  
}
public void paint(Graphics g)
{
g.setColor(Color.green);
g.fillRect(100,100,80,80);
}
}

class rect extends Canvas
{
  public rect() {  
        setBackground (Color.gray);  
        setSize(300, 200);  
}
public void paint(Graphics g)
{
g.setColor(Color.blue);
g.fillRect(100,100,180,80);
}
}

class CardLayoutDemo1 extends Frame implements ActionListener
{  
CardLayout card;  
Button b1,b2,b3;  
Panel pc,pbt;  
public  CardLayoutDemo1()
{  
  BorderLayout bl=new BorderLayout();
 setLayout(bl);  
        pc=new Panel();
pbt=new Panel();
        card=new CardLayout(40,30);  
        pc.setLayout(card);  
Panel p1=new Panel();          
Panel p2=new Panel();
Panel p3=new Panel();

p1.add(new circle() );
p2.add(new rect());
p3.add(new square());


        b1=new Button("Circle");  
        b2=new Button("Rectangle");  
        b3=new Button("Square");  
        b1.addActionListener(this);  
        b2.addActionListener(this);  
        b3.addActionListener(this);  
pc.add("a",p1);pc.add("b",p2);pc.add("c",p3);  
pbt.add(b1);              
pbt.add(b2);
pbt.add(b3);
        add(pbt,BorderLayout.SOUTH);add(pc,BorderLayout.NORTH);
    }  
    public void actionPerformed(ActionEvent e)
    {  
    card.next(pc);  
    }  
 
    public static void main(String[] args)
    {  
        CardLayoutDemo1 f=new CardLayoutDemo1();  
        f.setTitle("Card Layout Demo 1");
        f.setSize(400,400);  
        f.setVisible(true);  

    }  
}  

output:

click buttons you get three shapes output