j_digit.java

一个十分好的java基础学习的课件

// ////////////////////////////////////////////////////////
// 
// J_Digit.java
// 

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

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

public class J_Digit extends JApplet implements ActionListener
{
    private JTextField m_textField= new JTextField( );

    public void init( )
    { 
        Container container = getContentPane( );
        JButton b;
        String [] s= {BorderLayout.SOUTH, BorderLayout.EAST,
                                 BorderLayout.NORTH, BorderLayout.WEST};
        int i;
        for (i= 0; i<4; i++)
        {
            b= new JButton(""+i);
            container.add(b, s[i]);
            b.addActionListener(this);
        }
        container.add(m_textField, BorderLayout.CENTER);
    } // End of method: init

    public void actionPerformed(ActionEvent e)
    {
        String s= m_textField.getText( )+e.getActionCommand( );
        m_textField.setText(s);
    } // End of method: actionPerformed

} // End of class: J_Digit