Swing ContainerListener接口

用於接收容器事件的接口ContainerListener。容器事件類需要實現這個接口。

類聲明

以下是聲明 java.awt.event.ContainerListener接口：

public interface ContainerListener extends EventListener

接口方法

S.N.

方法 & 描述

void componentAdded(ContainerEvent e)
Invoked when a component has been added to the container.

void componentRemoved(ContainerEvent e)
Invoked when a component has been removed from the container.

方法繼承

This class inherits methods from the following interfaces:

java.awt.event.EventListener

ContainerListener 例子

選擇使用任何編輯器創建以下java程序在 D:/ > SWING > com > yiibai > gui >

SwingListenerDemo.java

package com.yiibai.gui; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingListenerDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingListenerDemo(){ prepareGUI(); } public static void main(String[] args){ SwingListenerDemo swingListenerDemo = new SwingListenerDemo(); swingListenerDemo.showContainerListenerDemo(); } private void prepareGUI(){ mainFrame = new JFrame("Java SWING Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); headerLabel = new JLabel("",JLabel.CENTER ); statusLabel = new JLabel("",JLabel.CENTER); statusLabel.setSize(350,100); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showContainerListenerDemo(){ headerLabel.setText("Listener in action: ContainerListener"); JPanel panel = new JPanel(); panel.setBackground(Color.magenta); panel.addContainerListener(new CustomContainerListener()); JLabel msglabel = new JLabel("Welcome to TutorialsPoint SWING Tutorial." ,JLabel.CENTER); panel.add(msglabel); controlPanel.add(panel); mainFrame.setVisible(true); } class CustomContainerListener implements ContainerListener { public void componentAdded(ContainerEvent e) { statusLabel.setText(statusLabel.getText() + e.getComponent().getClass().getSimpleName() + " added. "); } public void componentRemoved(ContainerEvent e) { statusLabel.setText(statusLabel.getText() + e.getComponent().getClass().getSimpleName() + " removed. "); } } }

編譯程序，使用命令提示符。到 D:/ > SWING 然後輸出以下命令。

D:SWING>javac comyiibaiguiSwingListenerDemo.java

如果沒有錯誤出現，這意味着編譯成功。使用下面的命令來運行程序。

D:SWING>java com.yiibai.gui.SwingListenerDemo

驗證下面的輸出

SWING