java - 如何将changeHandler()添加到我的程序中

Question

拜托，我尝试添加一个changeHandler 事件，但我认为我做得不对。我正在查看以下声明..

pickNum.addChangeListener(new ChangeHandler());

 @Override
 public void stateChanged(changeEvent e)
 {
   JSlider s = (JSlider)e.getSource();
   index = s.getValue();
 }

有什么事情我可以做得更好，因为它不起作用..

import javax.swing.*;

public class Slider extends JFrame{

public static int index;
JSlider pickNum = new JSlider(JSlider.HORIZONTAL,0,30,5);
public Slider()
{
 super("Slider");
 this.pack();
 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 pickNum.setMajorTickSpacing(10);
 pickNum.setMinorTickSpacing(1);
 pickNum.setPaintTicks(true);
 pickNum.setPaintLabels(true);
 pickNum.addChangeListener(new ChangeHandler());

 @Override
 public void stateChanged(changeEvent e)
 {
   JSlider s = (JSlider)e.getSource();
   index = s.getValue();
 }

 getPointedValue();
 this.add(pickNum);
 this.setVisible(true);

}

public final int getPointedValue()
{
    int value;
    value = pickNum.getValue();
    return value;
}


     public static void main(String[] args) {

    Slider frame = new Slider();
    System.out.println("value is :"+Slider.index);
   }

 }

[/CODE]

Answer 1

你的 ChangeHandler 是什么？您还没有发布该代码

这是使用更改监听器的示例

JSlider s = new JSlider();
s.addChangeListener(new ChangeListener() {
   public void stateChanged(ChangeEvent e) {
      System.out.println("Changed: " + e);
   }
});