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

public class TestRandomAccessFile{
    private File file;
    public static void main(String[] args){
        TestRandomAccessFile traf = new TestRandomAccessFile();
        traf.init();
        traf.record("Billy",22);
        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();
                if(record_breaker.equals(name)){
                    raf.writeInt(times);    
                    flag = true;
                    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 + "\trecord:" + times);
            }
            raf.close();                
        }catch(Exception e){
            e.printStackTrace();    
        }        
    }
}