打印流简述

PrintStream 和 PrintWriter

• 打印流只有输出流，没有输入流

PrintStream

package com.ftn.printStream;

import java.io.IOException;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;

public class PrintStream_ {
    public static void main(String[] args) throws IOException {
        PrintStream out = System.out;
        //PrintStream 默认输出位置为显示器
        out.println("打印一次");
        //因为print底层使用的是write输出，所以可以直接调用write打印
        out.write("aaa".getBytes(StandardCharsets.UTF_8));

        //可以修改打印流输出的位置/设备
        //修改为 d:\m1.txt
        System.setOut(new PrintStream("d:\\m1.txt"));
        System.out.println("hello,hell");
        out.close();
    }
}

PrintWriter

package com.ftn.printStream;

import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

public class PrintWriter_ {
    public static void main(String[] args) throws IOException {
        PrintWriter printWriter = new PrintWriter(System.out);
        printWriter.print("hhh");
        //更改打印输出位置
        PrintWriter printWriter1 = new PrintWriter(new FileWriter("d:\\t1.txt"));
        printWriter1.print("hehehe");
        printWriter.close();        //必须关闭流之后才能写入数据
        printWriter1.close();       //必须关闭流之后才能写入数据
    }
}

标签：PrintWriter,java,PrintStream,打印,简述,io,import,out
来源： https://blog.csdn.net/A_JOKER___/article/details/120380272