javaee字符文件的复制

package Zy;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Zy02 {
      //用字符流完成txt的复制
    public static void main(String[] args) throws IOException {
        FileReader r=new FileReader("d:\\java\\789.txt");
        FileWriter w=new FileWriter("e:\\java\\789.txt");
        char[] ch=new char[1024];
        int len=0;
        while((len=r.read(ch))!=-1){
            w.write(ch,0,len);
            w.flush();
        }
        r.close();
        w.close();
    }
}