[Java] FileReaderFileWriter 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