class Student {
    private String name; // 固定 15字节   
    private int score;

   public Student() {
          setName("noname");
    }

   public Student(String name, int score) {
       setName(name);
       this.score = score;
     }   

  
public void setName(String name) {
        StringBuilder builder = null;
       if(name != null)
           builder = new StringBuilder(name);
       else   
           builder = new StringBuilder(15);
       builder.setLength(15);
       this.name = builder.toString();
   } 

   public void setScore(int score) {
       this.score = score;
   } 

   public String getName() {
        return name;
    }

     public int getScore() {
         return score;
    }

     // 每笔记录固定写入34个字节

     public static int size() { 
       return 34;
    }
}

public class RandomAccessFileDemo {
    public static void main(String[] args) {
        Student[] students = {
                new Student("Justin", 90),
                new Student("momor", 95), 
                new Student("Bush", 88), 
                new Student("caterpillar", 84)
         }; 

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