Swing AdjustmentListener接口

用于接收調(diào)整事件的接口AdjustmentListener。過程調(diào)整事件的類需要實(shí)現(xiàn)這個(gè)接口。

類聲明

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

public interface AdjustmentListener
extends EventListener

接口方法

方法繼承

This class inherits methods from the following interfaces:

• java.awt.event.EventListener

AdjustmentListener 例子

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

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.showAdjustmentListenerDemo();
   }

   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 showAdjustmentListenerDemo(){
      headerLabel.setText("Listener in action: AdjustmentListener");      

      JPanel panel = new JPanel();
      JScrollBar scrollbar = new JScrollBar();
      scrollbar.addAdjustmentListener(new CustomAdjustmentListener());

      panel.add(scrollbar);
      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。到 D:/ > SWING 然后輸出以下命令。

D:SWING>javac comyiibaiguiSwingListenerDemo.java

如果沒有錯(cuò)誤出現(xiàn)，這意味著編譯成功。使用下面的命令來運(yùn)行程序。

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

驗(yàn)證下面的輸出