SandglassPattern.java

import java.util.Scanner;
public class SandglassPattern{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter the number of rows you want to print: ");
        int r = in.nextInt();            
        for(int i=0; i<=r-1 ; i++){
            for(int j=0; j<i; j++){
                System.out.print(" ");
            }
            for(int k=i; k<=r-1; k++){
                System.out.print("*" + " ");
            }
            System.out.println("");
        }
        for(int i=r-1; i>=0; i--){
            for(int j=0; j<i ;j++){
                System.out.print(" ");
            }
            for(int k=i; k<=r-1; k++){
                System.out.print("*" + " ");
            }
            System.out.println("");
        }
        in.close();
    }
}