用Java语言编写一个班级点名的程序

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一、要求：用Java语言编写一个班级点名的程序

二、时间：2015、3、26

三、实现代码：

package dianming;         import java.io.BufferedReader;  import java.io.BufferedWriter;  import java.io.File;  import java.io.FileOutputStream;  import java.io.IOException;  import java.io.InputStreamReader;  import java.io.OutputStreamWriter;  import java.util.ArrayList;  import java.util.List;  import java.util.Scanner;    public class dianming {   List stuList = new ArrayList();    // 点名    public void calling() throws IOException{   while(true){       System.out.println("   随机点名现在开始！");       System.out.println("点名请按【Y】，退出请按【N】:");       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));        String input = br.readLine();   if(input.toLowerCase().equals("y")){       int noNum = (int) (Math.random()*this.stuList.size());       String name = (String) this.stuList.get(noNum);   this.stuList.remove(noNum);       System.out.println("当前被点名的同学为:"+name);   }else if(input.toLowerCase().equals("n")){       String s;       File f=new File("b.txt");       FileOutputStream fos =new FileOutputStream(f);       BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(fos));     while (stuList.size() != 0) {       String name = (String)stuList.get(0);       System.out.println("存入name="+name);       bw.write(name);       bw.newLine();    stuList.remove(0);   }       bw.flush();       bw.close();   break;}   }   }   // 读入学生信息      public void readStudent(String fileName) throws Exception {       Scanner sc = new Scanner(new File(fileName)).useDelimiter("\n");        int count = 0;   while(sc.hasNext()){       count++;       String name = sc.next();       System.out.println(count+"="+name);       this.stuList.add(new String(name));   }   }   //存入学生信息     public static void main(String[] args) throws Exception {       dianming stu = new dianming();       System.out.println("开始新一轮的点名【1】，继续上一轮点名【2】:");       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));        String input = br.readLine();       String newFileName = "信管3&4班名单.txt";       String oldFileName = "b.txt";  if(input.toLowerCase().equals("1")){       stu.readStudent(newFileName);   }else if(input.toLowerCase().equals("2")){       stu.readStudent(oldFileName);   }       stu.calling();   }

四、运行结果截图

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