java编写一个花名随机抽取器的实现示例

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

 private static JLabel jl= new JLabel("文件：");
 private static JTextField jt =new JTextField();
 private static JButton OpenButton =new JButton("选择文件");
 private static JTextField jt2 =new JTextField();//文本框 显示抽取名单
 private static JButton StartButton =new JButton("开始抽取");
 private static JLabel ClassjL= new JLabel("班级：");
 private static JTextField ClassjT =new JTextField();//显示班级
 private static JLabel NumjL= new JLabel("人数：");
 private static JTextField NumjT =new JTextField();//显示人数
 private static JLabel jl2= new JLabel("抽取模式：");
 private static JComboBox jc= new JComboBox();//下拉列表框
 private static JButton AboutButton =new JButton("关于");
 private static JOptionPane jo =new JOptionPane();//弹出一个提示框
 private static String[]s ;//用来存放人名
 private static Font font = new Font("宋体",Font.BOLD,18); //设置字体对象
 private static int Number=0;//用来存放抽取人数

 private void windows() {
   JFrame jf =new JFrame ("花狗抽取器 本人博客:fdogcsdn.com");
   jf.setIconImage(new ImageIcon("Icon.jpg").getImage());
   Container c=jf.getContentPane();
   c.setLayout(new GridLayout(4,2,10,10)); 
   OpenButton.setFocusPainted(false);
   StartButton.setFocusPainted(false);
   AboutButton.setFocusPainted(false);//去掉按钮文字旁边的虚线框
   JPanel jp1 =new JPanel();
   JPanel jp2 =new JPanel(new BorderLayout());
   JPanel jp3 =new JPanel();
   JPanel jp4 =new JPanel();//添加面板
   jt.setColumns(10);
   ClassjT.setColumns(6);
   NumjT.setColumns(4);
   jt2.setHorizontalAlignment(JTextField.CENTER);
   jc.addItem("--请选择--");
   jc.addItem("抽取一人");
   jc.addItem("抽取三人");
   jc.addItem("抽取五人");
   jp1.add(jl);
   jp1.add(jt);
   jp1.add(OpenButton);
   jp2.add(jt2,BorderLayout.CENTER);
   jp3.add(ClassjL);
   jp3.add(ClassjT);
   jp3.add(NumjL);
   jp3.add(NumjT);
   jp3.add(jl2);
   jp3.add(jc); 
   jp4.add(StartButton);
   jp4.add(AboutButton);
   c.add(jp1);
   c.add(jp2);
   c.add(jp3);
   c.add(jp4);
   jf.setVisible(true);
   jf.setBounds(800, 200, 400, 500);
   jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   getOpenButton(); //下面三个方法是用来监听按钮事件方法
   getAboutButton();
   getSrartButton();
  }

  private void getOpenButton() {
   OpenButton.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {
     JFileChooser fc =new JFileChooser();//这个对象就是我们点击打开文件，出来的文件选择器
     fc.setCurrentDirectory(new File("."));//指定当前默认目录
     fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);//可以选择只打开文件或者文件夹
     fc.setMultiSelectionEnabled(false);//是否允许多选文件
     int i =fc.showOpenDialog(getContentPane());
     if(i==JFileChooser.APPROVE_OPTION) {//判断是否打开
      File file =fc.getSelectedFile();
      //显示选中内容
      jt.setText(fc.getSelectedFile().getName());
      try{
      FileReader fr =new FileReader(file);
      BufferedReader in =new BufferedReader (fr);
      String line= in.readLine();//读取txt文件中的内容
      s =line.split(" ");//以空格为分隔符，存储人名
      NewMessage();  //监听事件
      getjcomboBox();//监听事件
      }catch(Exception e1) {
      e1.printStackTrace();
      }    
     }
   }
   });
  }

  private void getAboutButton() {
   AboutButton.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    jo.showMessageDialog(null, "可建立txt文件:\n写入班级名字然后空格学生名字\n名字和名字之间必须要用空格隔开\n即可识别班级名称和人数以及名单");
   }
   });
  }

 private void getjcomboBox() {
   jc.addItemListener(new ItemListener() {
   public void itemStateChanged(ItemEvent e) {
    if(e.getStateChange() == ItemEvent.SELECTED) {
    String itemSize = (String) e.getItem(); 
    if(itemSize=="抽取一人") {
     Number =1;
    }
    if(itemSize=="抽取三人") {
     Number =3;
    }
    if(itemSize=="抽取五人") {
     Number =5;
    }
    }
   }
   });
  }

 private void getSrartButton() {
   StartButton.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    switch(Number) {
    case 1:
    int num1 =(int)1+(int)(Math.random()*(s.length-1-1));
    jt2.setText(s[num1]);
    break;
    case 3:
    int []num3=new int[100];
    for(int i=0;i<100;i++) {
     num3[i]=(int)1+(int)(Math.random()*(s.length-1-1));
    }
    for(int i=0;i<98;i++) {
     if(num3[i]!=num3[i+1] && num3[i]!=num3[i+2] && num3[i+1]!=num3[i+2]) {
       String strtext1= s[num3[i]]+" "+s[num3[i+1]]+" "+s[num3[i+2]];
       jt2.setText(strtext1);
     break;
     }
    }
    break;
    case 5:
    int []num5=new int[100];
    for(int i=0;i<100;i++) {
     num5[i]=(int)1+(int)(Math.random()*(s.length-1-1));
    }
    for(int i=0;i<95;i++) {
     if(num5[i]!=num5[i+1] && num5[i]!=num5[i+2] && num5[i]!=num5[i+3] && num5[i]!=num5[i+4]
     && num5[i+1]!=num5[i+2] && num5[i+1]!=num5[i+3] && num5[i+1]!=num5[i+4]
     &&num5[i+2]!=num5[i+3] && num5[i+2]!=num5[i+4]
     &&num5[i+3]!=num5[i+4]) {
       String strtext1= s[num5[i]]+" "+s[num5[i+1]]+" "+s[num5[i+2]]+" "+s[num5[i+3]]+" "+s[num5[i+4]];
       jt2.setText(strtext1);
     break;
     }
    }
    break;
    }
   }
   });
  }

 private void NewMessage() {
   ClassjT.setText(s[0]);
   String s1="";
   s1=""+(s.length-1);
   NumjT.setText(s1);
   jt2.setFont(font);
   jt2.setForeground(Color.blue);
   jt2.setText("已就绪，请开始抽取。");
  }

 public static void main(String[] args) {
 callmy call = new callmy();
 call.windows();
 }