Triangle Pattern in Java | Pyramid Pattern in Java

Let’s go through the logic for printing Triangle Pattern:

• Step - 1. Ask User for Number of rows in the Triangle.
• Step - 2. Iterate from First row to Last.
• Step - 3. Get the number of Space for the row and Print them.
• Step - 4. Get the number of * for every row and print them.
• Step - 5. Give a line break in order to go into the next line for next row.

Code for Triangle Pattern in Java:

package com.missTechy; import java.util.Scanner; public class Triangle { public static void main(String[] args) { // Ask the user for triangle size. System.out.println("Enter the triangle size :: "); // Create an instance of Scanner class present in util package. // Object of scanner class is used to take input from user. Scanner scanner = new Scanner(System.in); // Normally when scanner class object is used then it get the value in String format. // scanner object calls nextInt() method which is used to convert String into Int. int rows = scanner.nextInt(); // This variable is used to print the number of * in a row. int k = 0; // iterate from first row to last row. for(int i = 1; i <= rows; i++) { // create the space before printing *. // number of space in the starting of a row must be equal to the (total number of rows - current row number). for(int space = 1; space <= rows - i; space++) { // Print space only. System.out.print(" "); } // while loop is used to print the number of * in a row. // number of * in a row must be one less than the double of the number of row (2*currentRow -1). while(k != 2 * i - 1) { System.out.print("* "); // increment k so that the next * will print k++; } // used as break just to come into another line. System.out.println(); // initialize k to 0 in order to initialize the number of printed * for the next line to 0. k = 0; } } }

Output of Triangle Pattern in Java: