CardLayout class

CardLayout class

The CardLayout class manages the components in such a manner that only one component is visible at a time. It treats each component as a card that is why it is known as CardLayout.

Constructors of CardLayout class:

1.    CardLayout(): creates a card layout with zero horizontal and vertical gap. 2.    CardLayout(int hgap, int vgap): creates a card layout with the given horizontal and vertical gap.

Commonly used methods of CardLayout class:

·         public void next(Container parent): is used to flip to the next card of the given container. ·         public void previous(Container parent): is used to flip to the previous card of the given container. ·         public void first(Container parent): is used to flip to the first card of the given container. ·         public void last(Container parent): is used to flip to the last card of the given container. ·         public void show(Container parent, String name): is used to flip to the specified card with the given name.

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Example of CardLayout class:

1.    import java.awt.*;  

2.    import java.awt.event.*;  

3.      

4.    import javax.swing.*;  

5.      

6.    public class CardLayoutExample extends JFrame implements ActionListener{  

7.    CardLayout card;  

8.    JButton b1,b2,b3;  

9.    Container c;  

10.     CardLayoutExample(){  

11.           

12.         c=getContentPane();  

13.         card=new CardLayout(40,30);  

14. //create CardLayout object with 40 hor space and 30 ver space  

15.         c.setLayout(card);  

16.           

17.         b1=new JButton("Apple");  

18.         b2=new JButton("Boy");  

19.         b3=new JButton("Cat");  

20.         b1.addActionListener(this);  

21.         b2.addActionListener(this);  

22.         b3.addActionListener(this);  

23.               

24.         c.add("a",b1);c.add("b",b2);c.add("c",b3);  

25.                           

26.     }  

27.     public void actionPerformed(ActionEvent e) {  

28.     card.next(c);  

29.     }  

30.   

31.     public static void main(String[] args) {  

32.         CardLayoutExample cl=new CardLayoutExample();  

33.         cl.setSize(400,400);  

34.         cl.setVisible(true);  

35.         cl.setDefaultCloseOperation(EXIT_ON_CLOSE);  

36.     }  }

}