JAVA今日2021.8.2

JAVA scanner

Scannner01

package JAVASE.scanner;

import java.util.Scanner;

public class scanner01 {
    public static void main(String[] args) {
        //创建一个扫描器对象，用于接收键盘数据
        Scanner scanner = new Scanner(System.in);
        System.out.println("使用next方式接收:");
        //判断用户有没有输入字符串
        if (scanner.hasNext()){
            //使用next方式接收
            String str = scanner.next();
            System.out.println("输出的内容为："+str );
        }
        //会占用资源，用完就关掉
        scanner.close();

    }
}

Scanner02

package JAVASE.scanner;

import java.util.Scanner;

public class scanner02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("使用nextline方式接收：");
        if (scanner.hasNextLine()){
            String str = scanner.nextLine();
            System.out.println("输出的内容为："+str );

        }
        scanner.close();
    }
}

Scanner03

package JAVASE.scanner;

import java.util.Scanner;

public class scanner03 {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入内容：");

        String str = scanner.nextLine();

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

        scanner.close();
    }
}

2021.8.2