《JAVA高级程序设计》第六周作业

import java.awt.BorderLayout;
import java.awt.ScrollPane;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashSet;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class cj extends JFrame{
public cj(){
this.setTitle("抽奖系统");
this.setSize(250, 180);
this.setResizable(false);
this.setLocationRelativeTo(this);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setContentPane(createContentPanel());
}
private JPanel createContentPanel(){
JPanel panel=new JPanel(new BorderLayout());
panel.add(BorderLayout.CENTER,createCeterPanel());
return panel;
}

 private JPanel createCeterPanel(){
	 JPanel panel=new JPanel();
	 panel.add(new JLabel("点击抽奖"),JLabel.CENTER);
	 JButton start=new JButton("开始");
	 panel.add(start);
	 ScrollPane sp = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED);
     final JTextArea area = new JTextArea();
     sp.add(area);
	 panel.add(sp,BorderLayout.SOUTH);
	 start.addActionListener(new ActionListener() {
		
		@Override
		public void actionPerformed(ActionEvent arg0) {
			// TODO Auto-generated method stub
			Random random = new Random();
			 Object[] values = new Object[6];
			 HashSet hashSet = new HashSet();
			   for(int i = 0;i < values.length;i++){
			       int number = random.nextInt(1000) + 1;
			       hashSet.add(number);
			   }
			   
			   values = hashSet.toArray();
			   
			   area.append("一等奖号码为:"+values[0] + "\n");
			   area.append("二等奖号码为:"+values[1]+" " +values[2]+"\n");
			   area.append("二等奖号码为:"+values[3]+" "+values[4]+" "+values[5]+"\n");
		}
	});
	 return panel;
	 }
public static void main(String[] args) {
	new cj().setVisible(true);
}

}