?? xsjl.java
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/*
* Class.java
*
* Created on 2005年7月5日, 上午9:44
*/
/**
*
* @author zhaoyuan
*/
import java.io.*;
public class xsjl {
public String name;
public String sex;
public int age;
final static int length1=8;
final static int length2=4;
public xsjl(String name,String sex,int age){
if (name.length()>length1){
name=name.substring(0,8);//名字超過8個字節取前8個字節
}else
{while(name.length()<length1)
name=name+"\u0000";//名字不足8個字節用空格補充
}
this.name=name;
if(sex.length()>length2){
sex=sex.substring(0,4);
}else{
while(sex.length()<length2)
sex=sex+"\u0000";
}this.sex=sex;
this.age=age;
}
public static void main(String args[])throws Exception{
xsjl jl1=new xsjl("zhaoyuanqq","nan",24);
xsjl jl2=new xsjl("yuliu","nv",24);
xsjl jl3=new xsjl("moukang","nv",23);
RandomAccessFile ra=new RandomAccessFile("e:\\text.txt","rw");
ra.write(jl1.name.getBytes());
ra.write(jl1.sex.getBytes());
ra.writeInt(jl1.age);
ra.write(jl2.name.getBytes());
ra.write(jl2.sex.getBytes());
ra.writeInt(jl2.age);
ra.write(jl3.name.getBytes());
ra.write(jl3.sex.getBytes());
ra.writeInt(jl3.age);
ra.close();
RandomAccessFile raf=new RandomAccessFile("e:\\text.txt","r");
int len1=8;
int len2=4;
raf.skipBytes(16);/*跳過第一個學生的信息(8字節姓名4字節性別和4字節年齡共16字節)*/
System.out.println("第二個學生的信息");
String str1="";
String str2="";
for(int i=0;i<len1;i++)
str1=str1+(char)raf.readByte();
System.out.println(" name:"+str1);
str2="";
for(int i=0;i<len2;i++)
str2=str2+(char)raf.readByte();
System.out.println(" sex:"+str2);
System.out.println(" age:"+raf.readInt());
System.out.println("第一個學生的信息");
raf.seek(0);//把文件指針一道文件開始位置
str1="";
for(int i=0;i<len1;i++)
str1=str1+(char)raf.readByte();
System.out.println(" name:"+str1);
str2="";
for(int i=0;i<len2;i++)
str2=str2+(char)raf.readByte();
System.out.println(" sex:"+str2);
System.out.println(" age:"+raf.readInt());
System.out.println("第三個學生信息");
raf.skipBytes(16);//跳過第二個學生信息,避免重復讀取
str1="";
for(int i=0;i<len1;i++)
str1=str1+(char)raf.readByte();
System.out.println(" name:"+str1);
str2="";
for(int i=0;i<len2;i++)
str2=str2+(char)raf.readByte();
System.out.println(" sex:"+str2);
System.out.println(" age:"+raf.readInt());
raf.close();
}
}
/** Creates a new instance of Class */
/*public xsjl() {
}
}*/
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