作业6

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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);

}

}

作业6

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原文地址：http://www.cnblogs.com/songjiangtao521/p/5487688.html