String_project/src/Scanner_package/Scanner_demo1.java

package Scanner_package;

import java.util.Scanner;

public class Scanner_demo1 {
    public static void main(String[] args) {
        //1、创建对象
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个小数：");
        //2、接收一个小数
        double result = sc.nextDouble();
        //3、输出打印
        System.out.println(result);
    }
}