题目是如下：

Write an application that asks a user to enter student data and writes a random data file using student's ID number as a key field. Assuming a student record contains only an ID number(int type) and grade point average(double type). Each student Id number is three digits or few. Use JoptionPane for the input. Save the program as WriteStudentFile.java.


这是一道练习题．．．可我对RandomAccessFile却不是很明白　希望懂的此题目的朋友　能帮助解答一下．．谢谢了！

对哈．．．题目要求的　而我却不知道怎么入手写这个程序　焦躁一晚上了　ＮＮＤ　

谢谢版主purana....我复制下来仔细看的．．谢谢你能这么帮助我这个菜鸟．．很感谢你！