例子

import java.io.*;
public class Main {
    public static void main(String[] args) throws Exception {
        PrintWriter po = new PrintWriter(System.out);
        PrintWriter po2 = new PrintWriter("./pw.txt");
        po.write("asujudhbg");
        po2.write("asujudhbg");
        // flush + close
        po.close();
        po2.close();
    }
}