java-RGB调色面板的实现（事件监听器之匿名内部类）

package create;

import java.awt.BorderLayout;
import java.awt.Color;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class ZuoYe {
 private JFrame jf;
 private JLabel label1, label2, label3;
 private JSlider slider1, slider2, slider3;
 private JTextField field1, field2, field3;
 private JTextArea jta;

 public ZuoYe() {
 jf = new JFrame();
 label1 = new JLabel("R:");
 label2 = new JLabel("\n G:");
 label3 = new JLabel("B:");

 slider1 = new JSlider(0, 255, 127);
 slider2 = new JSlider(0, 255, 127);
 slider3 = new JSlider(0, 255, 127);

 field1 = new JTextField("127");
 field2 = new JTextField("127");
 field3 = new JTextField("127");

 field1.setEditable(false);
 field2.setEditable(false);
 field3.setEditable(false);

 jta = new JTextArea(5, 10);
 jta.setEditable(false);
 jta.setBackground(new Color(127, 127, 127));
 init();
 showMe();
 addEventHandler();
 }

 public void init() {
 JPanel jp1 = new JPanel();
 jp1.add(label1);
 jp1.add(slider1);
 jp1.add(field1);

 jp1.add(label2);
 jp1.add(slider2);
 jp1.add(field2);

 jp1.add(label3);
 jp1.add(slider3);
 jp1.add(field3);

 JPanel jp2 = new JPanel();
 jp2.add(jta);

 jf.add(jp1, BorderLayout.CENTER);
 jf.add(jp2, BorderLayout.EAST);
 jf.setVisible(true);
 }

 public void showMe() {
 jf.setSize(400, 200);
 jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
 }

 public void addEventHandler() {
 ChangeListener lis = new ChangeListener() {

  public void stateChanged(ChangeEvent arg0) {
  int r = slider1.getValue();
  int g = slider2.getValue();
  int b = slider3.getValue();
  field1.setText(r + "");
  field2.setText(g + "");
  field3.setText(b + "");
  Color c = new Color(r, g, b);
  jta.setBackground(c);
  }
 };
 slider1.addChangeListener(lis);
 slider2.addChangeListener(lis);
 slider3.addChangeListener(lis);
 }

 public static void main(String[] args) {
 //构造方法这样写调用对象，不用构造对象去调用方法，构造方法中末尾已经写过其他的方法
 ZuoYe ts = new ZuoYe();
// ts.showMe();
// ts.init();
 }
}