第六次作业

抽奖程序：用ArrayList类和random类
import java.awt.*;

import javax.swing.*;

import java.awt.event.;
import java.util.;
import java.util.List;

public class jRandom extends JFrame {
private JFrame frame;
private JButton startBUtton;

public jRandom() {
    makeFrame();
    frame.pack();
    frame.setVisible(true);
    frame.setSize(400, 215);
    frame.setLocation(550, 350);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

private void makeFrame() {

    frame = new JFrame(" 抽个奖吧！");
    ImageIcon imageIcon0 = new ImageIcon("t/1.png");
    frame.setIconImage(imageIcon0.getImage());
    Container contentPane = frame.getContentPane();
    startBUtton = new JButton();
    ImageIcon imageIcon1 = new ImageIcon("t/3.png");
    ImageIcon imageIcon2 = new ImageIcon("t/4.png");
    ImageIcon imageIcon3 = new ImageIcon("t/5.png");
    startBUtton.setIcon(imageIcon1);// 设置按钮形状
    startBUtton.setRolloverIcon(imageIcon2);// 设置鼠标滑过按钮的图像
    startBUtton.setPressedIcon(imageIcon3);// 设置鼠标按下按钮的形状
    startBUtton.setMargin(new Insets(0, 0, 0, 0)); // 设置按钮边框与边框内容之间的像素数
    startBUtton.setBorderPainted(false); // 不绘制边框

    // 按钮事件监听
    startBUtton.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            // TODO Auto-generated method stub
            makechoujiang();
        }
    });
    contentPane.add(startBUtton, BorderLayout.CENTER);

}

private void makechoujiang() {
    double baseNum = 0.50;
    String product = "100元,200元,500元,1000元";
    String num = "30,20,5,3";
    String[] p = product.split(",");
    String[] n = num.split(",");
    Random ran = new Random();
    double base = ran.nextDouble();
    if (base > baseNum) {
        ImageIcon imageIcon = new ImageIcon("t/2.png");
        JOptionPane.showMessageDialog(frame, "请您继续努力！", "抽奖结果",
                JOptionPane.PLAIN_MESSAGE, imageIcon);
        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]);
        }
    }
    // 打乱奖池数据
    int l = ran.nextInt(list.size());
    ImageIcon imageIcon = new ImageIcon("t/1.png");
    JOptionPane.showMessageDialog(frame, "恭喜您中了" + list.get(l) + "哟!!",
            "抽奖结果", JOptionPane.PLAIN_MESSAGE, imageIcon);

}

public static void main(String[] args) {
    // TODO Auto-generated method stub
    new jRandom();
}

}
程序界面如下：