testjslider.java

用JSlider动态改变颜色

import java.awt.*;
import javax.swing.event.*;
import javax.swing.*;  

public class TestJSlider extends JApplet implements ChangeListener
{
  JSlider jslR,jslG,jslB;
  TextField col= new TextField(30);
  
  double hValue=0.0,vValue=0.0;
  public void init()
  {
	Container c = getContentPane();
       
	jslR = new JSlider(JSlider.HORIZONTAL,0,255,0);
	jslG = new JSlider(JSlider.HORIZONTAL,0,255,0);
        jslB = new JSlider(JSlider.HORIZONTAL,0,255,0);
	
	jslR.setPaintLabels(true);
	
	jslG.setPaintLabels(true);
        jslB.setPaintLabels(true);
	
	c.setLayout(new GridLayout(4,1));
	c.add(jslR);
	c.add(jslG);
        c.add(jslB);
        c.add(col);
	
	jslR.addChangeListener(this);
	jslG.addChangeListener(this);
        jslB.addChangeListener(this);
  }
   int rValue,gValue,bValue;
  public void stateChanged(ChangeEvent e)
  {
        
 	if(e.getSource()==jslR)
 		rValue = ((JSlider)e.getSource()).getValue();
	else if(e.getSource()==jslG)
		gValue = ((JSlider)e.getSource()).getValue();
	else if(e.getSource()==jslB)
		bValue = ((JSlider)e.getSource()).getValue();
        Color c= new Color(rValue,gValue,bValue);
        
        col.setBackground(c);
	
  }
}