Seasonal display with Java switch

import java.util.Scanner;

public class Season{

	public static void main(String[] args){
		System.out.println("Please enter an integer");

	    //The scanner next to the input stream new is the constructor
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		switch (a) {
			case 1 : case 2: case 12:
				System.out.println("It's winter");
				break;
			case 3 : case 4 : case 5:
				System.out.println("It's spring");
				break;
			case 6 : case 7: case 8:
				System.out.println("It's summer");
				break;
			case 9 : case 10: case 11:
				System.out.println("It's Autumn");
				break;
			default :
				System.out.println(a+"The moon does not exist");
			}

	    //Use the close method to destroy the instance and
	    //Free the used memory area.
		scan.close();

	}
}

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