AdjustmentListener 接口

介紹

用於接收調整事件的接口AdjustmentListener。過程調整事件，需要實現這個接口的類。

類的聲明

以下是聲明的java.awt.event.AdjustmentListener接口：

public interface AdjustmentListener extends EventListener

接口中的方法

S.N.

方法＆說明

1

void adjustmentValueChanged(AdjustmentEvent e)
Invoked when the value of the adjustable has changed.

繼承的方法

這個類繼承的方法從下面的接口：

• java.awt.event.EventListener

AdjustmentListener示例

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

AwtListenerDemo.java

package com.yiibai.gui; import java.awt.*; import java.awt.event.*; public class AwtListenerDemo { private Frame mainFrame; private Label headerLabel; private Label statusLabel; private Panel controlPanel; public AwtListenerDemo(){ prepareGUI(); } public static void main(String[] args){ AwtListenerDemo awtListenerDemo = new AwtListenerDemo(); awtListenerDemo.showAdjustmentListenerDemo(); } private void prepareGUI(){ mainFrame = new Frame("Java AWT Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); headerLabel = new Label(); headerLabel.setAlignment(Label.CENTER); statusLabel = new Label(); statusLabel.setAlignment(Label.CENTER); statusLabel.setSize(350,100); controlPanel = new Panel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showAdjustmentListenerDemo(){ headerLabel.setText("Listener in action: AdjustmentListener"); ScrollPane panel = new ScrollPane(); panel.setBackground(Color.magenta); panel.getHAdjustable().addAdjustmentListener(new CustomAdjustmentListener()); Label msglabel = new Label(); msglabel.setAlignment(Label.CENTER); msglabel.setText("Welcome to TutorialsPoint AWT Tutorial."); panel.add(msglabel); controlPanel.add(panel); mainFrame.setVisible(true); } class CustomAdjustmentListener implements AdjustmentListener { public void adjustmentValueChanged(AdjustmentEvent e) { statusLabel.setText("Adjustment value: "+Integer.toString(e.getValue())); } } }

編譯程序，使用命令提示符。進入到 D:/> AWT，然後鍵入以下命令。

D:AWT>javac comyiibaiguiAwtListenerDemo.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:AWT>java com.yiibai.gui.AwtListenerDemo

驗證下面的輸出