exp2_3.java

以随机存取二进制度方式保存下列数据(rbi.dat),并从该二进制文件中读取数据,将其显示在屏幕上

import java.io.*;
public class exp2_3 {
	
	static public void main(String[] args){
		try{
  RandomAccessFile student=new RandomAccessFile("rbi.dat","rw");
    StudentData data1=new StudentData("030101A", "Zhangming", "English", 90, "Database", 81);
	StudentData data2=new StudentData("030102A", "LiXiao", "English", 98, "Java", 85);
	StudentData data3=new StudentData("030109B", "WuBin", "OS", 81, "C++", 88);
	StudentData data4=new StudentData("040203A", "WangWu","Physics", 81,"Data Structure", 78);

	data1.save(student,0);
	data2.save(student, 1);
	data3.save(student, 2);
	data4.save(student, 3);
	System.out.println("finish");
    student.close();
    
    RandomAccessFile studentRead=new RandomAccessFile("rbi.dat","r");
	for(int i=0;i<4;i++){
	studentRead.seek(i*80);System.out.print(studentRead.readUTF()+",");
	studentRead.seek(i*80+10);System.out.print(studentRead.readUTF()+",");
	studentRead.seek(i*80+30);System.out.print(studentRead.readUTF()+",");
	studentRead.seek(i*80+40);System.out.print(studentRead.readInt()+",");
	studentRead.seek(i*80+50);System.out.print(studentRead.readUTF()+",");
	studentRead.seek(i*80+70);System.out.print(studentRead.readInt());
	System.out.println("");
	
	}
	System.out.println("Load successed");
	studentRead.close();
	}catch(Exception e){e.printStackTrace();}

}
}