java 标准输出流、标准错误输出流、标准输入流及扫描仪

• 初步认识标准输出流、错误输出流、输入流、扫描仪

package com.mydemo.controller;

import java.util.Scanner;

public class HelloWorld {
    public static void main(String[] args) {
        System.err.println("HelloWorld");
        System.out.println("HelloWorld");
        
        System.out.println(System.in);
        System.out.println(System.out);
        System.out.println(System.err);
        
        Scanner scanner = new Scanner(System.in);
        String nextLine = scanner.nextLine();
    }
}

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