java文件写入与读取

import java.io.*;
public class BufferDemo {

public static void main(String args[]){
    int start = 0;
    int finish = 255;
    if (args.length>1){
        start = Integer.parseInt(args[0]);
        finish =Integer.parseInt(args[1]);
    }else if(args.length>0)
        start = Integer.parseInt(args[0]);
    ArgStream as = new ArgStream(start,finish);
    System.out.println("\nWriting:");
    boolean success = as.writeStream();
    System.out.println("\nReading:");
    boolean readSuccess = as.readStream();
}

}
class ArgStream{

int start = 0;
int finish = 255;
ArgStream(int st, int fin){
    start =st;
    finish = fin;

}
boolean writeStream(){
    try{
        FileOutputStream file = new FileOutputStream("numbers.dat");
        BufferedOutputStream buff = new BufferedOutputStream(file);
        for (int out = start;out<=finish;out++) {
            buff.write(out);
            System.out.print(" "+out);
        }
        buff.close();
        return true;

    }catch (IOException e){
        System.out.println("Exception:"+e.getMessage());
        return false;
    }
}
boolean readStream(){
    try{
        FileInputStream file =new FileInputStream ("numbers.dat");
        BufferedInputStream buff = new BufferedInputStream(file);
        int in=0;
        do{
            in= buff.read();
            if(in !=-1)
                System.out.print(" "+in);
        }while(in!=-1);
        buff.close();
        return true;


        }catch(IOException e){
            System.out.println("Exception:"+e.getMessage());
            return false;
    }
}

}