JAVA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.ArrayList;

import java.util.HashSet;

import java.util.List; 

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 Draw extends JFrame{

 public Draw(){

 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();

     JButton start=new JButton("开始抽奖");

     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

         

                double baseNum = 0.99;

                String product = "矿泉水,打火机,雨伞,指甲刀";

                String num = "2,2,2,1";

                String[] p = product.split(",");

                String[] n = num.split(",");

          

                java.util.Random ran = new java.util.Random();

                double base = ran.nextDouble();

          

                if (base > baseNum) {

                    System.err.println("没中奖");

                    return;

                }

          

                List<String> list = new ArrayList<String>();

                for (int i = 0; i < p.length; i++) {

                    for (int j = 0; j < Integer.parseInt(n[i]); j++) {

                        list.add(p[i]);

                    }

                }

                        //TODO 打乱奖池数据

                int l = ran.nextInt(list.size());

                area.append(list.get(l));

          

            }

   });

     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 Draw().setVisible(true);

}

 

}