打印流

PrintStream

 public void println（）自动换行

PrintWriter

package com.itheima.println;

import java.io.FileInputStream;
import java.io.PrintStream;
import java.io.PrintWriter;

public class Test2 {
    public static void main(String[] args) {
        try (
                //1、创建一个打印流管道
                PrintWriter ps = new PrintWriter("IO/src/itheima08.txt");
              
        ){

            ps.println(97);
            ps.println("a");
            ps.print(true);
            ps.print("我是好人");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 

输出语句的重定向 

 

package com.itheima.println;

import java.io.FileNotFoundException;
import java.io.PrintStream;

public class Test4 {
    public static void main(String[] args) {
        System.out.println("老骥伏枥");
        System.out.println("志在千里");
        try (
                PrintStream ps = new PrintStream("IO/src/itheima09.txt");
                ){
            //把系统默认的打印流对象改成自己设置的打印流
            System.setOut(ps);
            System.out.println("烈士暮年");
            System.out.println("壮心不已");
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}