simplelist.java

java swing 开发代码

//  SimpleList.java
// A simple example of a JList object built from an array of Strings.
//
package	jswing.ch07;

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

public class SimpleList extends JPanel {
    String label[] = { "Zero","One","Two","Three","Four","Five","Six",
                       "Seven","Eight","Nine","Ten","Eleven" };
    JList list;

    public SimpleList() {
        this.setLayout(new BorderLayout());
        list = new JList(label);
        JScrollPane pane = new JScrollPane(list);
        JButton button = new JButton("Print");
        button.addActionListener(new PrintListener());

        add(pane, BorderLayout.CENTER);
        add(button, BorderLayout.SOUTH);
    }

    public static void main(String s[]) {
         JFrame frame = new JFrame("Simple List Example");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setContentPane(new SimpleList());
         frame.setSize(250, 200);
         frame.setVisible(true);
    }

    // An inner class to respond to clicks on the Print button
    class PrintListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int selected[] = list.getSelectedIndices();
            System.out.println("Selected Elements:  ");

            for (int i=0; i < selected.length; i++) {
                String element =
                      (String)list.getModel().getElementAt(selected[i]);
                System.out.println("  " + element);
            }
        }
    }
}