java中用readObject方法遍历时报EOFException

public class SequenceDemo {
public static void main(String[] args) throws IOException, ClassNotFoundException {
    File s=new File("d:/Mydoc/123.txt");
    Students zhan=new Students("张三",21,true);
    Students li=new Students("李三",22,true);
    Students liu=new Students("刘三",20,true); 
    ObjectOutputStream dos=new ObjectOutputStream(new FileOutputStream(s));
    dos.writeObject(zhan);
    dos.writeObject(li);
    dos.writeObject(liu);
    System.out.println("序列化完成");
    dos.flush();
    dos.close();
    ObjectInputStream fos=new ObjectInputStream(new FileInputStream(s));
    Students m=null;
    try{
        while((m=(Students)fos.readObject())!=null){
        System.out.println("名字："+m.getName()+
                "\t年龄："+m.getAge()+"\t性别："+
                (m.isGender()?"男":"女"));    
    }
    }catch(EOFException e){
        System.out.println("输出结束");
    }
    fos.close();
}
}

运行结果：