[学习交流] 利用数组随机抽取幸运观众

大家看看我这段代码还有什么要改的地方吗

package com.mingrisoft;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;

public class ArrayExample extends JFrame {

/**
   *
   */
private static final long serialVersionUID = -2577935223412903226L;
private JPanel contentPane;
private JTextField nameField;
private JTextArea personnelArea;
private JTextArea resultArea;

/**
   * Launch the application.
   */
public static void main(String[] args) {
      try {
         UIManager
                  .setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
      } catch (Throwable e) {
         e.printStackTrace();
      }
      EventQueue.invokeLater(new Runnable() {
         public void run() {
            try {
                  ArrayExample frame = new ArrayExample();
                  frame.setVisible(true);
            } catch (Exception e) {
                  e.printStackTrace();
            }
         }
      });
}

/**
   * Create the frame.
   */
public ArrayExample() {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setBounds(100, 100, 498, 300);
      contentPane = new JPanel();
      contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
      setContentPane(contentPane);
      setTitle("利用数组随机抽取幸运观众");
      contentPane.setLayout(null);

      JPanel panel = new JPanel();
      panel
            .setBorder(new TitledBorder(
                     null,
                     "输入在场观众姓名按回车",
                     TitledBorder.LEADING, TitledBorder.TOP, null,
                     new Color(59, 59, 59)));
      panel.setBounds(10, 10, 174, 242);
      contentPane.add(panel);
      panel.setLayout(new BorderLayout(0, 5));

      nameField = new JTextField();
      nameField.addKeyListener(new KeyAdapter() {
         @Override
         public void keyPressed(KeyEvent e) {
            do_textField_keyPressed(e);
         }
      });
      panel.add(nameField, BorderLayout.NORTH);
      nameField.setColumns(10);

      JScrollPane scrollPane = new JScrollPane();
      panel.add(scrollPane);

      personnelArea = new JTextArea();
      personnelArea.setEditable(false);
      scrollPane.setViewportView(personnelArea);

      JPanel panel_1 = new JPanel();
      panel_1.setBorder(new TitledBorder(null,
            "选取观众人员：",
            TitledBorder.LEADING, TitledBorder.TOP, null, new Color(59, 59,
                     59)));
      panel_1.setBounds(183, 10, 219, 242);
      contentPane.add(panel_1);
      panel_1.setLayout(new BorderLayout(0, 0));

      JScrollPane scrollPane_1 = new JScrollPane();
      panel_1.add(scrollPane_1);

      resultArea = new JTextArea();
      resultArea.setEditable(false);
      resultArea.setLineWrap(true);
      scrollPane_1.setViewportView(resultArea);

      JButton button = new JButton("抽取");
      button.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            do_button_actionPerformed(e);
         }
      });
      button.setBounds(407, 164, 63, 25);
      contentPane.add(button);

      JButton button_1 = new JButton("退出");
      button_1.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            do_button_1_actionPerformed(e);
         }
      });
      button_1.setBounds(407, 215, 63, 25);
      contentPane.add(button_1);
}

protected void do_textField_keyPressed(KeyEvent e) {
      if (e.getKeyChar() != '\n')// 不是回车字符不做处理
         return;
      String name = nameField.getText();
      if (name.isEmpty())// 如果文本框没有字符串不做处理
         return;
      personnelArea.append(name + "\n");// 把输入人名与回车符添加到人员列表
      nameField.selectAll();// 选择文本框所有字符
}

protected void do_button_actionPerformed(ActionEvent e) {
      String perstring = personnelArea.getText();// 获取人员列表文本
      String[] personnelArray = perstring.split("\n{1,}");// 获取人员数组
      int index = (int) (Math.random() * personnelArray.length);// 生成随机数组索引
      // 定义包含格式参数的中奖信息
      String formatArg = "本次抽取观众人员：\n\t%1$s\n恭喜%1$5s成为本次观众抽奖的大奖得主。"
            + "\n\n我们将为%1$s**颁发：\n\t过期的酸奶二十箱。";
      // 为中奖信息添加人员参数
      String info = String.format(formatArg, personnelArray[index]);
      resultArea.setText(info);// 在文本域显示中奖信息
}

protected void do_button_1_actionPerformed(ActionEvent e) {
      dispose();
}
}

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[学习交流] 利用数组随机抽取幸运观众

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