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
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: