Patterns.java

import java.util.*;

public class Patterns {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

         /* Solid Rectangle
         * 
         * int rows=5;
         * 
         * for(int i=1 ; i<=rows ;i++){
         * for(int j=0; j<=4 ; j++){
         * System.out.print("*");
         * }
         * System.out.println();
         * }
         */

         /* Hollow Rectangle

        int n = 4;
        int m = 5;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                if (i == 0 || i == n - 1 || j == 0 || j == m - 1) {
                    System.out.print("*");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
            */

        /* Right Half Pyramid
             * 
             * int rows=5;
             * 
             * for(int i= 1 ; i<=rows ; i++ ){
             * for (int j= 1 ; j<=i ; j++){
             * System.out.print("*");
             * }
             * System.out.println();
             * }
             */
           
           
         

        }
    }

}