Java Program to Print Half Diamond Star Pattern

In this article, we will understand how to print half diamond star pattern. The pattern is formed by using multiple for-loops and print statements.

Below is a demonstration of the same −

Input

Suppose our input is −

Enter the number of rows : 8

Output

The desired output would be −

The half diamond pattern :
*
**
***
****
*****
******
*******
********
*******
******
*****
****
***
**
*

Algorithm

Step 1 - START
Step 2 - Declare three integer values namely i, j and my_input
Step 3 - Read the required values from the user/ define the values
Step 4 - We iterate through two nested 'for' loops to get space between the characters.
Step 5 - After iterating through the innermost loop, we iterate through another 'for' loop. This will help print the required character.
Step 6 - Now, print a newline to get the specific number of characters in the subsequent lines.
Step 7 - Display the result
Step 8 - Stop

Example 1

Here, the input is being entered by the user based on a prompt. You can try this example live in our coding ground tool .

import java.util.Scanner;
public class HalfDiamond{
   public static void main(String []args){
      int i, j, my_input;
      System.out.println("Required packages have been imported");
      Scanner my_scanner = new Scanner(System.in);
      System.out.println("A reader object has been defined ");
      System.out.print("Enter the number of rows : ");
      my_input = my_scanner.nextInt();
      System.out.print("The half diamond pattern : ");
      for (i = 0; i < my_input; i++){
         for (j = 0; j < i + 1; j++)
            System.out.print("*");
         System.out.print("\n");
      }
      for (i = 1; i < my_input; i++){
         for (j = i; j < my_input; j++)
            System.out.print("*");
         System.out.print("\n");
      }
   }
}

Output

Required packages have been imported
A reader object has been defined
Enter the number of rows : 8
The half diamond pattern :
*
**
***
****
*****
******
*******
********
*******
******
*****
****
***
**
*

Example 2

Here, the integer has been previously defined, and its value is accessed and displayed on the console.

public class HalfDiamond{
   public static void main(String []args){
      int i, j, my_input;
      my_input = 8;
      System.out.println("The number of rows is defined as " +my_input);
      System.out.print("The half diamond pattern : ");
      for (i = 0; i < my_input; i++){
         for (j = 0; j < i + 1; j++)
            System.out.print("*");
         System.out.print("\n");
      }
      for (i = 1; i < my_input; i++){
         for (j = i; j < my_input; j++)
            System.out.print("*");
         System.out.print("\n");
      }
   }
}

Output

The number of rows is defined as 8
The half diamond pattern : *
**
***
****
*****
******
*******
********
*******
******
*****
****
***
**
*