checkboxes.java

程序设计模式java入门源码大全

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

public class Checkboxes extends JFrame implements ItemListener
{
    CheckboxAdapter checks[];
    JTextField text;

    public Checkboxes() 
    {
        Container contentPane = getContentPane();
        contentPane.setLayout(new FlowLayout());

        checks = new CheckboxAdapter[4];

        for(int loopIndex = 0; loopIndex 
          <= checks.length - 1; loopIndex++){
            checks[loopIndex] = new CheckboxAdapter("Check " + 
              loopIndex);
            checks[loopIndex].addItemListener(this);
            contentPane.add(checks[loopIndex]);
        }

        text = new JTextField(30);

        contentPane.add(text); 
    }

    public void itemStateChanged(ItemEvent e)
    {
        String outString = new String("Selected: ");

        for(int loopIndex = 0; loopIndex 
          <= checks.length - 1; loopIndex++){
            if(checks[loopIndex].isSelected()) {
                outString += " checkbox " + loopIndex;
            }
        }
        text.setText(outString);
    }

    public static void main(String args[]) 
    {
        final Checkboxes f = new Checkboxes();

        f.setBounds(100, 100, 400, 300);
        f.setVisible(true);
        f.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

}