Scanner-Demo01-03

package com.kuang.scanner;

import java.util.Scanner;
//=====================
//Demo01
//=====================
public class Demo01 {
    public static void main(String[] args) {

        //创建一个扫描器对象,用于接受键盘数据
        Scanner scanner = new Scanner(System.in);

        System.out.println("使用next方式接受: ");

        //判断用户有没有输入字符串
        if(scanner.hasNext()){
            String str = scanner.next();
            System.out.println("输出的内容为: " + str);
        }
        //凡是属于IO流的类如果不关闭会一直占用资源, 要养成好习惯用完就关掉
        scanner.close();
    }
}

package com.kuang.scanner;

import java.util.Scanner;
//=====================
//Demo02
//=====================
public class Demo02 {
    public static void main(String[] args) {
        //从键盘接受数据
        Scanner scanner = new Scanner(System.in);

        System.out.println("使用nextLine方式接受: ");

        //判断是否还有输入
        if(scanner.hasNextLine()){
            String str = scanner.nextLine();
            System.out.println("输出的内容为: " + str);
        }

        scanner.close();
    }
}

package com.kuang.scanner;

import java.util.Scanner;
//=====================
//Demo03
//=====================
public class Demo03 {
    public static void main(String[] args) {
        //从键盘接受数据
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入数据: ");

        String str = scanner.nextLine();

        System.out.println("输出的内容为: " + str);

        scanner.close();
    }
}