第五次作业（1）

使用RandomAccessFile类实现游戏中记录打破记录的玩家信息和成绩的功能

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

public class test{
private File file;
public static void main(String[] args){
TestRandomAccessFile traf = new TestRandomAccessFile();
traf.init();
traf.record("Adom",80);
traf.listAllRecords();

}

public void record(String record_breaker, int times){
try{
RandomAccessFile raf = new RandomAccessFile(file,"rw");
boolean flag = false;
while(raf.getFilePointer() < raf.length()){
String name = raf.readUTF();
long prior = raf.getFilePointer();
if (record_breaker.equalsIgnoreCase(name)) {
flag = true;
//比较传递进来的数与之前数的大小
if (raf.readInt() < times) {
//利用seek()方法跳转到prior的位置
raf.seek(prior);
raf.writeInt(times);
break;
}
} else {
raf.skipBytes(4);
}

                     }
    if(!flag){
        raf.writeUTF(record_breaker);
        raf.writeInt(times);    
    }
    raf.close();                
}catch(Exception e){
    e.printStackTrace();    
}

}

public void init(){
if(file == null){
file = new File("record.txt");
try{
file.createNewFile();
}catch(IOException e){
e.printStackTrace();
}
}
}

public void listAllRecords(){
try{
RandomAccessFile raf = new RandomAccessFile(file,"r");
while(raf.getFilePointer() < raf.length()){
String name = raf.readUTF();
int times = raf.readInt();

        System.out.println("name:" + name + "	record:" + times);
    }
    raf.close();                
}catch(Exception e){
    e.printStackTrace();    
}       

}
}