[Java] PrintWriter

import java.io.*;
public class CopyFileTest4{
    public static void main(String[] args) throws IOException{
        FileReader fr = new FileReader("CopyFileTest4.java");
        BufferedReader br = new BufferedReader(fr);
       
        FileWriter fw = new FileWriter("temp.txt");
        PrintWriter pw = new PrintWriter(fw);
       
        String read = br.readLine();
        while(read!=null){
            pw.println(read);
            read = br.readLine();
        }
        pw.flush();
        pw.close();
    }
}
//PrintWriter可以提供println()方法,直接输出一行