Indicar el día de la semana en Java

import java.io.*;
 
public class Semana
{
	public static void main(String [] args) throws IOException
	{
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
 
		System.out.print("Introduce un número: ");
		int num = Integer.parseInt(br.readLine());		
		switch(num)
		{
			case 1:
				System.out.println("lunes");
				break;
			case 2:
				System.out.println("martes");
				break;
			case 3:
				System.out.println("miercoles");
				break;
			case 4:
				System.out.println("jueves");
				break;
			case 5:
				System.out.println("viernes");
				break;
			case 6:
				System.out.println("sabado");
				break;
			case 7:
				System.out.println("domingo");
				break;
			default:
				System.out.println("ese dia no existe");
				break;
		}
	}		
}