Java Program to Print Right Triangle, Half Pyramid Pattern

Java programs to print the half pyramid pattern have been given here. Both the right half and left half of the pyramid using *, numbers and letters have been covered.

Page content(s):

1. Program & Output: Right half pyramid

 1.1. Using *

 1.2. Using numbers

 1.3. Using alphabets

2. Program & Output: Left half pyramid

 2.1. Using *

 2.2. Using numbers

 2.3. Using alphabets

3. Program & Output: Inverted half pyramid

 3.1. Using *

 3.2. Using numbers

 3.3. Using alphabets

1. Program & output to print the right half pyramid pattern

1.1. Java Program & output to print the right half pyramid pattern using *

Code has been copied

/*****************************
  	alphabetacoder.com
Java program to print the right
half pyramid pattern using *
******************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print *
            for (j = 1; j <= i; j++) {
                System.out.print("*");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 6

*

**

***

****

*****

******

1.2. Java Program & output to print the right half pyramid pattern using numbers

Code has been copied

/**********************************
  	alphabetacoder.com
Java program to print the right
half pyramid pattern using numbers
***********************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print numbers
            for (j = 1; j <= i; j++) {
                System.out.print(j + " ");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 6

1

1 2

1 2 3

1 2 3 4

1 2 3 4 5

1 2 3 4 5 6

1.3. Java Program & output to print the right half pyramid pattern using alphabets

Code has been copied

/***********************************
       alphabetacoder.com
Java program to print the right
half pyramid pattern using alphabets
************************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print letters
            for (j = 1; j <= i; j++) {
                System.out.print((char)(j + 64) + " ");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 6

A

A B

A B C

A B C D

A B C D E

A B C D E F

2. Program & output to print the left half pyramid pattern

2.1. Java Program & output to print the left half pyramid pattern using *

Code has been copied

/***********************************
    alphabetacoder.com
Java program to print the left half
of the pyramid pattern using *
************************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print space
            for (j = 1; j <= row - i; j++) {
                System.out.print(" ");
            }
            // print *
            for (j = 1; j <= i; j++) {
                System.out.print("*");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 6

     *

    **

   ***

  ****

 *****

******

2.2. Java Program & output to print the left half pyramid pattern using numbers

Code has been copied

/***********************************
    	alphabetacoder.com
Java program to print the left half
of the pyramid pattern using numbers
************************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print space
            for (j = 1; j <= 2 * (row - i); j++) {
                System.out.print(" ");
            }
            // print numbers
            for (j = 1; j <= i; j++) {
                System.out.print(j + " ");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 5

        1

      1 2

    1 2 3

  1 2 3 4

1 2 3 4 5

2.3. Java Program & output to print the left half pyramid pattern using alphabets

Code has been copied

/*************************************
    	alphabetacoder.com
Java program to print the left half
of the pyramid pattern using alphabets
**************************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print space
            for (j = 1; j <= 2 * (row - i); j++) {
                System.out.print(" ");
            }
            // print letters
            for (j = 1; j <= i; j++) {
                System.out.print((char)(j + 64) + " ");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 5

        A

      A B

    A B C

  A B C D

A B C D E

3. Program & output to print the right half pyramid pattern

3.1. Java Program & output to print the inverted half pyramid pattern using *

Code has been copied

/*********************************
	alphabetacoder.com
Java program to print the inverted
half pyramid pattern using *
**********************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print *
            for (j = row; j >= i; j--) {
                System.out.print("*");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 6

******

*****

****

***

**

*

3.2. Java Program & output to print the inverted half pyramid pattern using numbers

Code has been copied

/*********************************
	alphabetacoder.com
Java program to print the inverted
half pyramid pattern using numbers
**********************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print numbers
            for (j = row; j >= i; j--) {
                System.out.print((row - j + 1) + " ");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 6

1 2 3 4 5 6

1 2 3 4 5

1 2 3 4

1 2 3

1 2

1

3.3. Java Program & output to print the inverted half pyramid pattern using alphabets

Code has been copied

/***********************************
  	alphabetacoder.com
Java program to print the inverted
half pyramid pattern using alphabets
************************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int row, i, j;

        // take input 
        System.out.print("Enter the number of rows: ");
        row = sc.nextInt();

        // new line
        System.out.println("");

        // display the pattern
        for (i = 1; i <= row; i++) {
            // print letters
            for (j = row; j >= i; j--) {
                System.out.print((char)(row - j + 65) + " ");
            }
            // new line
            System.out.println("");
        }
    }
}

Output

Enter the number of rows: 6

A B C D E F

A B C D E

A B C D

A B C

A B

A