java中的defaultmode,Java Swing - 如何使用DefaultListModel管理JList中的项目

/*

Java Swing, 2nd Edition

By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole

ISBN: 0-596-00408-7

Publisher: O'Reilly

*/

// ListModelExample.java

//An example of JList with a DefaultListModel that we build up at runtime.

//

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.DefaultListModel;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JList;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

public class Main extends JPanel {

JList list;

DefaultListModel model;

int counter = 15;

public Main() {

setLayout(new BorderLayout());

model = new DefaultListModel();

list = new JList(model);

JScrollPane pane = new JScrollPane(list);

JButton addButton = new JButton("Add Element");

JButton removeButton = new JButton("Remove Element");

for (int i = 0; i < 15; i++)

model.addElement("Element " + i);

addButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

model.addElement("Element " + counter);

counter++;

}

});

removeButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (model.getSize() > 0)

model.removeElementAt(0);

}

});

add(pane, BorderLayout.NORTH);

add(addButton, BorderLayout.WEST);

add(removeButton, BorderLayout.EAST);

}

public static void main(String s[]) {

JFrame frame = new JFrame("List Model Example");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setContentPane(new Main());

frame.setSize(260, 200);

frame.setVisible(true);

}

}