java调色板（用滑块控制RGB的值）

import java.awt.BorderLayout;import java.awt.Color;import java.awt.GridLayout;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JSlider;import javax.swing.JTextField;import javax.swing.event.ChangeEvent;import javax.swing.event.ChangeListener;public class ColorFrame extends JFrame{//变色内部类:当移动滑块时，将面板的背景色设为三个滑块组合成的RGB值，并将三个文本框的值对应修改private class Change implements ChangeListener {@Overridepublic void stateChanged(ChangeEvent e) {jp1.setBackground(new Color(sl1.getValue(),sl2.getValue(),sl3.getValue()));jt1.setText(sl1.getValue()+"");jt2.setText(sl2.getValue()+"");jt3.setText(sl3.getValue()+"");}}private JPanel jp1,jp2,jp3,jp4,jp5;//一个主面板显示颜色，三个面板用于放对应标语、滑块和文本框，最后一个面板用于组合private JLabel jl1,jl2,jl3;//三个标语：红、绿、蓝private JSlider sl1,sl2,sl3;//三个滑块private JTextField jt1,jt2,jt3;//三个文本框用于显示RGBpublic ColorFrame() {this.setTitle("调色板");jp1=new JPanel();jp2=new JPanel();jp3=new JPanel();jp4=new JPanel();jp5=new JPanel();jl1=new JLabel("红");jl2=new JLabel("绿");jl3=new JLabel("蓝");sl1=new JSlider();sl1.setMaximum(255);sl1.setMinimum(0);//设置滑块最大最小值sl2=new JSlider();sl2.setMaximum(255);sl2.setMinimum(0);sl3=new JSlider();sl3.setMaximum(255);sl3.setMinimum(0);jt1=new JTextField(2);jt2=new JTextField(2);jt3=new JTextField(2);jt1.setEditable(false);//将文本框设置为不可编辑jt2.setEditable(false);jt3.setEditable(false);jt1.setText(0+"");jt2.setText(0+"");jt3.setText(0+"");sl1.addChangeListener(new Change());sl2.addChangeListener(new Change());sl3.addChangeListener(new Change());sl1.setValue(0);//设置滑块初始值sl2.setValue(0);sl3.setValue(0);jp1.setBackground(new Color(sl1.getValue(),sl2.getValue(),sl3.getValue()));jp2.add(jl1);jp2.add(sl1);jp2.add(jt1);jp3.add(jl2);jp3.add(sl2);jp3.add(jt2);jp4.add(jl3);jp4.add(sl3);jp4.add(jt3);jp5.setLayout(new GridLayout(3,1));jp5.add(jp2);jp5.add(jp3);jp5.add(jp4);this.add(jp1);this.add(jp5,BorderLayout.SOUTH);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setSize(300,300);}public static void main(String[] args) {new ColorFrame().setVisible(true);}}