package com.liu.scanner;

import java.util.Scanner;

public class Demo2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入：");

        String str = scanner.nextLine();
        System.out.println("结果为："+str);

        scanner.close();
    }

}

不用判断