j_button.java

一个十分好的java基础学习的课件

// ////////////////////////////////////////////////////////
// 
// J_Button.java
// 

// ////////////////////////////////////////////////////////

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

public class J_Button
{
    public static void main( String args[] )
    { 
        JFrame app = new JFrame( "Example of event-handling" );

        Container cp = app.getContentPane( );
        JButton   b= new JButton("Pressed 0 times!");
        cp.setLayout( new BorderLayout( ) );
        cp.add(b, BorderLayout.CENTER);
        b.addActionListener( new ActionListener( )
            {
                int m_count = 0;
                public void actionPerformed(ActionEvent e)
                {
                    JButton b= (JButton)e.getSource( );
                    b.setText("Pressed " + (++m_count) + " times");
                } // End of method: actionPerformed
            } // End of the anonymous inner class
        ); // End of invoking addActionListener

        app.setSize( 100, 80 );
        app.setVisible( true );
        app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
    } // End of method: main

} // End of class: J_Button