[Java] FileReader/FileWriter 字符流

import java.io.*;
public class CopyFileTest2{
    public static void main(String[] args) throws IOException{
        FileReader fr = new FileReader("1.txt");
        FileWriter fw = new FileWriter("2.txt");
        int read = fr.read();
        while(read!= -1){
            fw.write(read);
            read = fr.read();
        }
        fr.close();
        fw.close();
    }
}
//FileReader/FileWriter只能读取和写入字符流