Swing으로 간단한 색상표 만들기

//간단한 색상표를 만들어 보자

package swing;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;

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

//복사해서 쓸것
//Java5.0버전 이후 프레임 앞에 컨테이너가 기본으로 하나가 있다.
//따라서 컨테이너를 바꿔준다.
public class SliderTest extends JFrame implements ChangeListener
{
 Container cp;
 JSlider sdRed,sdGreen,sdBlue;
 JLabel lblRed,lblGreen,lblBlue;
 
 JPanel pColor;
 
 //rgb값 설정
 int r=0,g=0,b=0;        //기본값을 0으로 줘서 if 문에서 값을 못받더라도 초기값을 0으로 설정해줌
 
 
 
 public SliderTest(String title)
 {
  super(title);
  cp=this.getContentPane();
  this.setDesign();
  
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setBounds(300,100,400,400);
  cp.setBackground(new Color(255, 255, 200));
  this.setVisible(true);
 }

 

 @Override
 public void stateChanged(ChangeEvent e)
 {
  Object ob=e.getSource();
  
  if(ob==sdRed)
   r=sdRed.getValue();
  else if(ob==sdGreen)
   g=sdGreen.getValue();
  else if(ob==sdBlue)
   b=sdBlue.getValue();
  
  lblRed.setText(String.valueOf(r));
  lblBlue.setText(String.valueOf(b));
  lblGreen.setText(String.valueOf(g));
  
  pColor.setBackground(new Color(r,g,b));
  
  
  
  
  
  
  
 }

 public void setDesign()
 {
  
  JPanel p1=new JPanel();
  JPanel p2=new JPanel();
  JPanel p3=new JPanel();
  JPanel pTop=new JPanel(new GridLayout(3,1));
  
  cp.setLayout(new GridLayout(2,1));
  //sb.setLayout(new BorderLayout());
  
  sdRed=new JSlider(JSlider.HORIZONTAL,0,255,255);
  lblRed=new JLabel("255",JLabel.CENTER);
  p1.add(new JLabel("빨강"));
  p1.add(sdRed);
  p1.add(lblRed);
  pTop.add(p1);
  
  sdGreen=new JSlider(JSlider.HORIZONTAL,0,255,0);
  lblGreen=new JLabel("0",JLabel.CENTER);
  p2.add(new JLabel("초록"));
  p2.add(sdGreen);
  p2.add(lblGreen);
  pTop.add(p2);
  
  sdBlue=new JSlider(JSlider.HORIZONTAL,0,255,255);
  lblBlue=new JLabel("255",JLabel.CENTER);
  p3.add(new JLabel("파랑"));
  p3.add(sdBlue);
  p3.add(lblBlue);
  pTop.add(p3);
  
  cp.add("North",pTop);
  
  pColor=new JPanel();
  pColor.setBackground(new Color(255,0,255));
  cp.add(pColor);
  
  
  //이벤트 발생
  
  sdRed.addChangeListener(this);
  sdGreen.addChangeListener(this);
  sdBlue.addChangeListener(this);
   }
 
 public static void main(String[] args)
 {
  new SliderTest("stanrd swing form");
 }

}