一个JSlider的例子

关于JSlider，大家可以先去这里看看它的API  http://download.oracle.com/javase/tutorial/uiswing/components/slider.html

运行结果为： 大家可以在此基础上尝试加上刻度，呵呵。

  1: /**

  2:  * 窗口中使用三个JLabel、三个JSlider和三个JTextField，

  3:  * 三个JLabel分别显示“红”、“绿”、“蓝”，三个JSlider的取值范围设定为从0到255，

  4:  * 三个JTextField分别显示对应JSlider的当前值，

  5:  * 程序中用三个JSlider选定的值作为参数构造一个颜色，将窗口的背景色设定为该颜色。

  6:  */

  7: 

  8: /**

  9:  * @author Rolen Holt

 10:  * @version 25/5/2011

 11:  */

 12: import java.awt.*;

 13: 

 14: import javax.swing.*;

 15: import javax.swing.event.ChangeEvent;

 16: import javax.swing.event.ChangeListener;

 17: 

 18: import java.awt.event.*;

 19: 

 20: public class JSliderDemo extends JFrame implements ChangeListener{

 21: 	

 22: 	JTextField textField1;

 23: 	JTextField textField2;

 24: 	JTextField textField3;

 25: 	

 26: 	JLabel label1;

 27: 	JLabel label2;

 28: 	JLabel label3;

 29: 	

 30: 	JSlider slider1;

 31: 	JSlider slider2;

 32: 	JSlider slider3;

 33: 	

 34: 	JPanel panel;

 35: 	

 36: 	JSliderDemo(){

 37: 		setTitle("JSliderDemo");

 38: 		setSize(500,500);

 39: 		setVisible(true);

 40: 		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 41: 		

 42: 		label1=new JLabel("红");

 43: 		label2=new JLabel("绿");

 44: 		label3=new JLabel("蓝");

 45: 		

 46: 		textField1=new JTextField(5);

 47: 		textField2=new JTextField(5);

 48: 		textField3=new JTextField(5);

 49: 		

 50: 		slider1=new JSlider(JSlider.HORIZONTAL,0,255,125);

 51: 	

 52: 		

 53: 		slider2=new JSlider(JSlider.HORIZONTAL,0,255,125);

 54: 	

 55: 		

 56: 		slider3=new JSlider(JSlider.HORIZONTAL,0,255,125);

 57: 

 58: 		

 59: 		panel=new JPanel();

 60: 		

 61: 		panel.add(label1);

 62: 		panel.add(slider1);

 63: 		panel.add(textField1);

 64: 		panel.add(label2);

 65: 		panel.add(slider2);

 66: 		panel.add(textField2);

 67: 		panel.add(label3);

 68: 		panel.add(slider3);

 69: 		panel.add(textField3);

 70: 		add(panel);

 71: 

 72: 		slider1.addChangeListener(this);

 73: 		slider2.addChangeListener( this);

 74: 		slider3.addChangeListener( this);

 75: 	}

 76: 	

 77: 	public void stateChanged(ChangeEvent event){

 78: 		if((JSlider)event.getSource()==slider1){

 79: 			String str=""+slider1.getValue();

 80: 			textField1.setText(str);

 81: 		}

 82: 		if((JSlider)event.getSource()==slider2){

 83: 			String str=""+slider2.getValue();

 84: 			textField2.setText(str);

 85: 		}

 86: 		if((JSlider)event.getSource()==slider3){

 87: 			String str=""+slider3.getValue();

 88: 			textField3.setText(str);

 89: 		}

 90: 		panel.setBackground(new Color(slider1.getValue(),slider2.getValue(),slider3.getValue()));

 91: 	}

 92: 	

 93: 	public static void main(String[] args){

 94: 		new JSliderDemo();

 95: 	}

 96: }

 97: