java 交通红绿灯 小程序[程序思路和过程解说和源代码]完成

效果图：

 

 

思路：

 

和上一个企鹅小程序类似，不过代码繁琐一些，

 

利用thread线程来运行, 继承于JPanel 用repaint()调用paintcomponent()和配合Thread的静态sleep()来实现绘图 达到红绿灯的变换和闪烁效果

 

此程序利用enum枚举来实现颜色变量，自己也是第一个使用java的enum枚举 也看了一点资料 ，然后探索了下使用的 希望能得到更多的实例来学习枚举  感觉JAVA里的枚举有点像一个类了。。。哈哈 不过我还只是简单使用没用到那层 都是java api自带的枚举比较函数.

 

因为类似上面的企鹅程序 所以就不多解释了 很简单的  不懂可以留言评论 我会回复

 

代码：

import javax.swing.*; import java.awt.*; import java.awt.geom.Ellipse2D; public class Traffic extends JFrame{ trafficePane traffic=new trafficePane(); public Traffic(){ super("交通红绿灯-可以自行设置各等等待时间! create by qkl"); JPanel pane=new JPanel(); pane.setLayout(new GridLayout(1,1,15,15)); pane.add(traffic); setContentPane(pane); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(130,300); setVisible(true); } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Traffic test=new Traffic(); } } class trafficePane extends JPanel implements Runnable{ Thread runner; colorT colors; int showhilte; public trafficePane(){ if(runner==null) { runner=new Thread(this); runner.start(); } } @Override protected void paintComponent(Graphics arg0) { // TODO Auto-generated method stub Graphics2D comp2D=(Graphics2D)arg0; comp2D.setBackground(Color.black); comp2D.setColor(Color.black); comp2D.fillRect(10, 10, 100, 240); comp2D.setColor(Color.yellow); Shape shape = new Ellipse2D.Float(35, 30,50, 50); comp2D.draw(shape); comp2D.fill(shape); comp2D.setColor(Color.green); shape = new Ellipse2D.Float(35, 100, 50, 50); comp2D.draw(shape); comp2D.fill(shape); comp2D.setColor(Color.red); shape = new Ellipse2D.Float(35, 170, 50, 50); comp2D.draw(shape); comp2D.fill(shape); if(colors.equals(colorT.Green)) //comp2D.drawString("2", 0, 0); { shape = new Ellipse2D.Float(35, 100, 50, 50); comp2D.setColor(Color.green); //comp2D.drawOval(35, 100, 50, 50); //comp2D.fillRect(35, 100, 50, 50); comp2D.draw(shape); comp2D.fill(shape); } if(colors.toString()=="Yellow") //comp2D.drawString("1", 100, 100); { comp2D.setColor(Color.yellow); //comp2D.drawOval(35, 30, 50, 50); shape = new Ellipse2D.Float(35, 30,50, 50); comp2D.draw(shape); comp2D.fill(shape); } if(colors.toString()=="Red") //comp2D.drawString("3", 100, 100); { shape = new Ellipse2D.Float(35, 170, 50, 50); comp2D.setColor(Color.red); //comp2D.drawOval(35, 170, 50, 50); comp2D.draw(shape); comp2D.fill(shape); } if(colors.toString()=="Whilte") //comp2D.drawString("0", 10, 20); { if(showhilte==0) { shape = new Ellipse2D.Float(35, 30,50, 50); comp2D.setColor(Color.white); //comp2D.drawOval(35, 30, 50, 50); comp2D.draw(shape); comp2D.fill(shape); } else if(showhilte==1){ shape = new Ellipse2D.Float(35, 100, 50, 50); comp2D.setColor(Color.white); //comp2D.drawOval(35, 100, 50, 50); comp2D.draw(shape); comp2D.fill(shape); } else if(showhilte==2){ shape = new Ellipse2D.Float(35, 170, 50, 50); comp2D.setColor(Color.white); //comp2D.drawOval(35, 170, 50, 50); comp2D.draw(shape); comp2D.fill(shape); } comp2D.setColor(Color.blue); comp2D.drawString("交通红绿灯", 30, 262); } } @Override public void run() { // TODO Auto-generated method stub while(true) { changeColor(3,3,6); } } public void changeColor(int Ystop,int Bstop,int Rstop) { for(int i=0;i<Ystop;i++) { showhilte=0; colors=colorT.Whilte; repaint(); pause(500); colors=colorT.Yellow; repaint(); pause(500); } for(int i=0;i<Bstop;i++) { showhilte=1; colors=colorT.Whilte; repaint(); pause(1000); colors=colorT.Green; repaint(); pause(1000); } for(int i=0;i<Rstop;i++) { showhilte=2; colors=colorT.Whilte; repaint(); pause(1000); colors=colorT.Red; repaint(); pause(1000); } } public void pause(int time) { try{ Thread.sleep(time); } catch(Exception e){} } } enum colorT{ Red,Yellow,Green,Whilte };