A Java example to print different pyramid.


Pyramid.java

package com.silan;
import java.util.Collections;
public class  Pyramid {
    public static void main(String[] args) { 
        int rows = 5; 
        System.out.println("\n1. Half Pyramid\n");
        for (int i = 0; i < rows; i++) { 
            for (int j = 0; j <= i; j++) {
                System.out.print("*");
            }
            System.out.println("");
        } 
        System.out.println("\n2. Full Pyramid\n");
        for (int i = 0; i < rows; i++) { 
            for (int j = 0; j < rows - i; j++) {
                System.out.print(" "); 
            }
            for (int k = 0; k <= i; k++) {
                System.out.print("* ");
            } 
            System.out.println("");  //java 8 , one line
             
            System.out.println("\n3. Full Pyramid (Compact)\n");
            for (int i = 0; i < rows; i++) {
                System.out.println(String.join("", Collections.nCopies(5 - i - 1, " ")) +
                    String.join("", Collections.nCopies(2 * i + 1, "*")));
            }  // java 8
             
            System.out.println("\n4. Inverted Pyramid\n"); 
            for (int i = rows; i > 0; i--) { 
                System.out.println(String.join("", Collections.nCopies(5 - i, " ")) +
                    String.join("", Collections.nCopies(2 * i - 1, "*")));
            } 
        }
    }

Output


1. Half Pyramid

*
**
***
****
*****

2. Full Pyramid

     *
    * *
   * * *
  * * * *
 * * * * *

3. Full Pyramid (Compact)

    *
   ***
  *****
 *******
*********

4. Inverted Pyramid

*********
 *******
  *****
   ***
    *

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