将两个文本文件合并到一个文件中去

//将两个文本文件合并到一个文件中去
package classwork10;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;

public class Hebing {

    public static void main(String[] args) throws IOException {
    BufferedInputStream bf=new BufferedInputStream(new FileInputStream(new File("D:/dssjava/result1.txt")));
    byte[] buf=new byte[bf.available()];
    bf.read(buf);
    BufferedInputStream bf1=new BufferedInputStream(new FileInputStream(new File("D:/dssjava/result.txt")));
    byte[] buf1=new byte[bf1.available()];
    bf1.read(buf1);
    PrintWriter pw=new PrintWriter("D:/dssjava/result.txt");
    pw.println(new String(buf)+new String(buf1));
    bf.close();
    bf1.close();
    pw.close();
    System.out.println("操作已完成");
    }

}