User Input with Scanner in Java

import java.util.Scanner;

public class UserInput {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter your country: ");
        String country = scanner.nextLine();
        System.out.println("your country is "+ country);
        scanner.close();
    }
}

Enter your country: 
seoul
your country is seoul

import java.util.Scanner;

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

        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter number x * 5 = ? ");
        boolean hasNextDouble = scanner.hasNextDouble();

        if (hasNextDouble){
            Double number = scanner.nextDouble();
            System.out.println(number * 5);
        }
        else{
            System.out.println("Please enter number");
        }
        scanner.close();
    }
}

Enter number x * 5 = ? 
4
20.0