JAVA ActionListener

                                        Action Listener

Action Listener :-  Listener is an interface in java that listens some event generated by component  ActionEvent fires on

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 when user click on a button

• press enter in a TextField
• choose a mentItem

Press small case button click me and than capital CLICK ME

• 

*************** ActionListener ***********************/

1.  ActionListener 
2.  void actioonPerformance
3.  addActionListener()

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 How to Write an ActionListener

Syntax:...................

class Example implements ActionListener

{

    public example() //constructor

    {

        component.addActionListener(this);

    }

    public void actionPerformed(ActuionEvent e)

    {

        // write your code

    }

}

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copy code perform event on laptop...

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class MyFrame extends JFrame implements ActionListener

{

    Container c;

    JButton button;

    public MyFrame()

    {

        c=this.getContentPane();

        c.setLayout(null);

        button=new JButton("Click Me");

        button.setBounds(100,100,100,30);

        c.add(button);

        button.addActionListener(this);

    }

    public void actionPerformed(ActionEvent e)

    {

        String str=button.getText();

        button.setText(str.toUpperCase());

    }

}

public class ActionEvent1

{

    public static void main(String[] args) 

    {

        MyFrame f=new MyFrame();

        f.setTitle("Action Event ");

        f.setBounds(100,100,400,400);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        f.setVisible(true);

    }

}

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