第六次作业

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 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<Integer> hashSet = new HashSet<Integer>();
               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;
     }
 private JPanel createContentPanel(){
 JPanel panel=new JPanel(new BorderLayout());
 panel.add(BorderLayout.CENTER,createCeterPanel());
 return panel;
 }
public static void main(String[] args) {
    new cj().setVisible(true);
}

}