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  • 动态随机抽奖程序的实现

    import java.awt.BorderLayout;
    import java.awt.Color;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.util.Random;
    import javax.swing.ImageIcon;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    
    
    public class Demo implements ActionListener{
    
    	/**
    	 * @param args
    	 */
    	static JButton middleJB,westJB,southJB,northJB,eastJB;
    	static JFrame jf;
    	
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		jf = new JFrame("麻将");
    		jf.setSize(800,600);
    		jf.setIconImage(new ImageIcon("east.gif").getImage());
    		jf.setLayout(new BorderLayout());
    		
    //		String a[] = {"east","west","south","north","middle"};
    		
    //		for(int i=0;i<5;i++){
    //			System.out.println(a[i]);
    //			jf.add(BorderLayout.WEST,new JButton(new ImageIcon("west.jpg")));
    //		}
    		
    		ImageIcon eastImg = new ImageIcon("east.gif");
    		eastJB = new JButton(eastImg);
    		jf.add(BorderLayout.EAST,eastJB);
    		
    		
    		ImageIcon westImg = new ImageIcon("west.jpg");
    		westJB = new JButton(westImg);
    		jf.add(BorderLayout.WEST,westJB);
    		//jf.add(BorderLayout.WEST,new JButton(new ImageIcon("west.jpg")));
    	
    		
    		ImageIcon southImg = new ImageIcon("south.gif");
    		southJB = new JButton(southImg);
    		jf.add(BorderLayout.SOUTH,southJB);
    		//jf.add(BorderLayout.SOUTH,new JButton(new ImageIcon("south.gif")));
    		
    		
    		ImageIcon northImg = new ImageIcon("north.gif");
    		northJB = new JButton(northImg);
    		jf.add(BorderLayout.NORTH,northJB);
    		//jf.add(BorderLayout.NORTH,new JButton(new ImageIcon("north.gif")));
    		
    		
    		
    		ImageIcon middleImg = new ImageIcon("middle.gif");
    		middleJB = new JButton(middleImg);
    		jf.add(BorderLayout.CENTER,middleJB);
    		//jf.add(BorderLayout.CENTER,new JButton(new ImageIcon("middle.gif"))); 简化
    		
    		middleJB.addActionListener(new Demo());
    		
    		
    		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		jf.setVisible(true);
    		
    
    	}
    
    	@Override
    	public void actionPerformed(ActionEvent arg0) {
    		Random r = new Random();
    		int num=0;
    		while(num<(r.nextInt(10)+1)*2){
    			System.out.println(num);
    			final int j = num % 4;
    			Thread t1 = new Thread(new Runnable(){
    				public void run() {
    					switch(j){
    					case 0:
    						eastJB.setBackground(Color.yellow);
    						westJB.setBackground(Color.gray);
    						southJB.setBackground(Color.gray);
    						northJB.setBackground(Color.gray);
    						break;
    					case 1:
    						eastJB.setBackground(Color.gray);
    						westJB.setBackground(Color.yellow);
    						southJB.setBackground(Color.gray);
    						northJB.setBackground(Color.gray);
    						break;
    					case 2:
    						eastJB.setBackground(Color.gray);
    						westJB.setBackground(Color.gray);
    						southJB.setBackground(Color.yellow);
    						northJB.setBackground(Color.gray);
    						break;
    					case 3:
    						eastJB.setBackground(Color.gray);
    						westJB.setBackground(Color.gray);
    						southJB.setBackground(Color.gray);
    						northJB.setBackground(Color.yellow);
    						break;
    					}
    					jf.update(jf.getGraphics());
    				}
    			});
    		
    			t1.start();
    			
    			try {
    				t1.sleep(300);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			
    			num++;
    		
    		}
    	}
    
    }
    
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  • 原文地址:https://www.cnblogs.com/zpchcbd/p/11820862.html
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