Pattern Programs in JAVA can enhance your programming and logical skills using loops.

Here we will learn some of these patterns under 3 categories:

Star Pattern Programs with Java
Numeric Pattern Programs with Java
Character Pattern Programs with Java

So let’s start with the star pattern programs

Star Pattern Programs In With Java

Java program for printing Right Half pyramid or Right Triangle

import java.util.Scanner;


public class RightHalfPyramid{


    public static void main(String[] args) {

        System.out.println(“Enter the number of rows for pattern: “);

        Scanner sc = new Scanner(System.in);  // taking the input with scanner

        int rows = sc.nextInt();


        for(int row = 1; row <= rows; ++row) {

            for(int col = 1; col <= row; ++col) {

                System.out.print(“* “);

            }

            System.out.println();

        }

         sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 5

* * 

* * * 

* * * * 

* * * * *

Java program for printing Left Half pyramid or Left Triangle

import java.util.Scanner;


public class LeftHalfPyramid

{

    public static void main(String[] args)

    {


        System.out.println(“Enter the number of rows for pattern: “);

        Scanner sc = new Scanner(System.in);  // taking the input with scanner

        int rows = sc.nextInt();

        

        for (int row=1; row<=rows; row++) 

        { 

            // Printing space in decreasing order 

            for (int col=rows; col>row; col–)

            {

                System.out.print(” “);

            }

            // Printing star in increasing order

            for (int star=1; star<=row; star++)

            {

                System.out.print(“*”);

            }

            System.out.println();

        }

         sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 5

    *

   **

  ***

 ****

*****

Java program for printing Full Pyramid or Triangle

import java.util.Scanner;


public class FullPyramid

{

    public static void main(String[] args)

    {


        System.out.println(“Enter the number of rows for pattern: “);

        Scanner sc = new Scanner(System.in);  // taking the input with scanner

        int rows = sc.nextInt();

        

        for (int row=1; row<=rows; row++) 

        { 

            // Print space in decreasing order 

            for (int col=rows; col>row; col–)

            {

                System.out.print(” “);

            }

            // Print star in increasing order

            for (int star=1; star<=row; star++)

            {

                System.out.print(“* “);

            }

            System.out.println();

        }

        sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 5

    * 

   * * 

  * * * 

 * * * * 

* * * * *

Java program for printing Rightly Inverted Half Pyramid or Downward Right Half Triangle

import java.util.Scanner;


public class InvertedHalfPyramid {


    public static void main(String[] args) {

        

        System.out.println(“Enter the number of rows for pattern: “);

        Scanner sc = new Scanner(System.in);  // taking the input with scanner

        int rows = sc.nextInt();


        for(int row = rows; row >= 1; –row) {

            for(int col = 1; col <= row; ++col) {

                System.out.print(” * “);

            }

            System.out.println();

        }

        sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 5 

 *  *  *  *  * 

 *  *  *  * 

 *  *  * 

 *  * 

 *

Java program for printing Left Inverted Half Pyramid or Downward Left Half Triangle

import java.util.Scanner;

public class InvertedHalfPyramid

{

 

    public static void main(String[] args)

    {

        System.out.println(“Enter the number of rows for pattern: “);

        Scanner sc = new Scanner(System.in);  // taking the input with scanner

        int rows = sc.nextInt();

        for (int row= rows; row>= 1; row–)

        {

            for (int col=rows; col>row;col–)

            {

                System.out.print(” “);

            }

            for (int count=1;count<=row;count++)

            {

                System.out.print(“*”);

            }

            System.out.println(“”);

        }

        sc.close();


    }

}

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Output for the above program

Enter the number of rows for pattern: 5

*****

 ****

  ***

   **

    *

Java program for printing Inverted full pyramid or inverted triangle

import java.util.Scanner;

public class InvertedFullPyramid

{

 

    public static void main(String[] args)

    {

        System.out.println(“Enter the number of rows for pattern: “);

        Scanner sc = new Scanner(System.in);  // taking the input with scanner

        int rows = sc.nextInt();

        for (int row= rows; row>= 1; row–)

        {

            for (int col=rows; col>row;col–)

            {

                System.out.print(” “);

            }

            for (int count=1;count<=row;count++)

            {

                System.out.print(” *”);

            }

            System.out.println(“”);

        }

        sc.close();


    }

}

Output for the above program

Enter the number of rows for pattern: 5

 * * * * *

  * * * *

   * * *

    * *

     *

Java Program for printing Diamond Pattern with stars

import java.util.Scanner;


public class Diamond

{

    public static void main(String[] args)

    {

        // Scanner object

        Scanner scanner = new Scanner(System.in);


        // taking the number of rows with the scanner

        System.out.println(“Enter the number of rows for pattern: “);


        int rows = scanner.nextInt();

        

        for (int row=1; row<=rows; row++) 

        { 

            // Print space in decreasing order 

            for (int col=rows; col>row; col–)

            {

                System.out.print(” “);

            }

            // Print star in increasing order

            for (int count=1; count<=(row * 2) -1; count++) 

            { 

               System.out.print(“*”); 

            } 

            System.out.println(); 

        } 

        for (int row=rows-1; row>=1; row–)

        {

         // Printing space in increasing order

            for (int col=rows-1; col>=row; col–)

            {

                System.out.print(” “);

            }

            // Printing stars in decreasing order

            for (int count=1; count<=(row * 2) -1; count++)

            {

                System.out.print(“*”);

            }

            

            System.out.println();

        }

        scanner.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 5

    *

   ***

  *****

 *******

*********

 *******

  *****

   ***

     *

Java Program for printing Sand Glass with Stars

import java.util.Scanner;

 

public class SandGlass {

 public static void main(String[] args) {

   // scanner object

   Scanner sc = new Scanner(System.in);

   System.out.println(“Enter the number of rows for pattern: “);

  // taking the number of rows with scanner

   int rows = sc.nextInt();

   for (int row = 0; row <= rows – 1; row++) {

     for (int col = 0; col < row; col++) {

       System.out.print(” “);

     }

     for (int count = row; count <= rows – 1; count++) {

       System.out.print(“* “);

     }

     System.out.println(“”);

   }

   for (int row = rows – 1; row >= 0; row–) {

     for (int col = 0; col < row; col++) {

       System.out.print(” “);

     }

     for (int count = row; count <= rows – 1; count++) {

       System.out.print(“* “);

     }

     System.out.println(“”);

   }

   sc.close();

 }

}

Output for the above program

Enter the number of rows for pattern: 5

* * * * * 

 * * * * 

  * * * 

   * * 

    * 

    * 

   * * 

  * * * 

 * * * * 

* * * * * 

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After the star pattern programs, we will now see the numeric pattern programs in java

Numeric Pattern Programs With Java

Java program to print simple numbered triangle pattern

import java.util.Scanner;

 

public class Main

{

    public static void main(String[] args)

   {

      // scanner object

       Scanner sc = new Scanner(System.in);

       System.out.println(“Enter the number of rows for pattern: “);

       int n = sc.nextInt(); // taking input with scanner sc

       int row, col,number;

  

       for(row=0; row<n; row++) // outer loop for rows

       {

           number=1;

           for(col=0; col<=row; col++) // inner loop for rows

           {

               // adding a space after number

               System.out.print(number+ ” “);

  

               //incrementing value of number

               number++;

           }

           // printing an empty line

           System.out.println();

       }

   }

 

}

Output for the above program

Enter the number of rows for pattern: 

5

1 2 

1 2 3 

1 2 3 4 

1 2 3 4 5

Java Program to print Floyd’s triangle pattern

import java.io.*;

import java.util.Scanner;

 

public class NumberPattern {

 public static void printNums(int num) {

   // initialising starting number

   int row, col, number = 1;

 

   for (row = 0; row < num; row++) {

        for (col = 0; col <= row; col++) {

       // // adding a space after number

       System.out.print(number + ” “);

 

       // incrementing number at every column

       number = number + 1;

     }

 

     // ending line after each row

     System.out.println();

   }

 }

 

 public static void main(String args[]) {

   // scanner object

   Scanner sc = new Scanner(System.in);

   System.out.println(“Enter the number of rows for pattern: “);

   int num = sc.nextInt(); // taking input with scanner sc

   printNums(num);

   sc.close();

 }

}

Output for the above program

Enter the number of rows for pattern: 6

2 3 

4 5 6 

7 8 9 10 

11 12 13 14 15 

16 17 18 19 20 21

Java Program for printing Pascal’s triangle Pattern

import java.io.*;

import java.util.Scanner;

public class PascalPattern {


    public static void main(String[] args) {

        //scanner object

        Scanner sc = new Scanner(System.in);

        System.out.println(“Enter the number of rows pattern: “);

        // taking input with scanner

        int rows = sc.nextInt();

        int number = 1;


        for(int row = 0; row < rows; row++) {

            for(int space = 1; space < rows – row; ++space) {

                System.out.print(”  “);

            }


            for(int col = 0; col <= row; col++) {

                if (col == 0 || row == 0)

                    number = 1;

                else

                    number = number * (row – col + 1) / col;


                System.out.printf(“%4d”, number);

            }

            // printing new line after iterations

            System.out.println();

        }

    }

}

Output for the above program

Enter the number of rows for pattern: 6

             1

           1   1

         1   2   1

       1   3   3   1

     1   4   6   4   1

   1   5  10  10   5   1

Java Program for printing repeated numbers pattern

import java.util.Scanner;

  

public class RepeatedPattern

{       

    public static void main(String[] args)

    {

        Scanner sc = new Scanner(System.in); //Taking rows value from the user

        System.out.println(“Enter the number of rows for pattern: “);

 

        int rows = sc.nextInt();    

        for (int i = 1; i <= rows; i++)

        {

            for (int j = 1; j <= i; j++)

            {

                System.out.print(i+” “);

            }

               

            System.out.println();

        }    

        sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 6

2 2 

3 3 3 

4 4 4 4 

5 5 5 5 5 

6 6 6 6 6 6

Java Program to Print Inverted Half Pyramid with numbers

import java.io.*;

import java.util.Scanner;


public class HalfPyramid {


    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in); // Scanner Object  

        System.out.println(“Enter the number of rows for pattern: “);    

      // Taking rows value from the user with scanner

        int rows = sc.nextInt();    

     

        for(int row = rows; row >= 1; –row) {

            for(int col = 1; col <= row; ++col) {

                System.out.print(col + ” “);

            }

            System.out.println();

        }

        sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 6


1 2 3 4 5 6 

1 2 3 4 5 

1 2 3 4 

1 2 3 

1 2 

1

Java Program to print repeated number pattern

import java.io.*;

import java.util.Scanner;


public class MainClass

{

    public static void main(String[] args) 

    {

        Scanner sc = new Scanner(System.in);          // Scanner Object  

        System.out.println(“Enter the number of rows for pattern: “);         

        int rows = sc.nextInt();         // Taking rows value from the user with scanner

        

        for (int row = 1; row <= rows; row++) 

        {


            for (int col = 1; col <= row; col++) 

            { 

                System.out.print(col+” “); 

            }             


            for (int col = row-1; col >= 1; col–)

            {

                System.out.print(col+” “);

            } 

            

            System.out.println();

        }         

        sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 6

1 2 1 

1 2 3 2 1 

1 2 3 4 3 2 1 

1 2 3 4 5 4 3 2 1 

1 2 3 4 5 6 5 4 3 2 1

After numeric pattern programs, we have character pattern programs in java.

Character Pattern Programs With Java

Java program to print right triangle character pattern

import java.io.*;

import java.util.Scanner;

 

public class RightAlphaTri

{            

    public static void main(String[] args)

    {

        int alphabet = 65;     //ASCII value of A is 65  

        Scanner sc = new Scanner(System.in);  // Scanner Object

  

        System.out.println(“Enter the number of rows for pattern: “);         

       // Taking rows value from the user with a scanner


        int rows = sc.nextInt();         

        for (int row = 0; row <= rows; row++)

        {

            for (int col = 0; col <= row; col++)

            {

                System.out.print((char) (alphabet + col) + ” “);

            }

            System.out.println();

        }

        sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 6 

A B 

A B C 

A B C D 

A B C D E 

A B C D E F 

A B C D E F G

Java program to print repeated character pattern

import java.io.*;

import java.util.Scanner;


public class Edureka

{            

    public static void main(String[] args)

    {

        int alphabet = 65;

        Scanner sc = new Scanner(System.in);  // Scanner Object  

        System.out.println(“Enter the number of rows for pattern: “); 


        // Taking rows value from the user with a scanner

        

        int rows = sc.nextInt();         

        for (int row = 0; row<= rows; row++)

        {

            for (int col = 0; col <= row; col++)

            {

                System.out.print((char) alphabet + ” “);

            }

            alphabet++;

            System.out.println();

        }

        sc.close();

    }

}

Output for the above program

Enter the number of rows for pattern: 6 

B B 

C C C 

D D D D 

E E E E E 

F F F F F F

Java Program to Print Pyramid Pattern with alphabets

import java.io.*;

import java.util.Scanner;

 

public class Main {

 public static void main(String[] args) {

   Scanner sc = new Scanner(System.in);  // Scanner Object 

       System.out.println(“Enter the number of rows for pattern: “);       

       // Taking rows value from the user with scanner 

       int rows = sc.nextInt(); 

       int alphabet = 65;

   for (int row = 0; row <= rows; row++) {

     for (int col = 8; col > row; col–) {

       System.out.print(” “);

     }

     for (int count = 0; count <= row; count++) {

       System.out.print((char) (alphabet + count) + ” “);

     }

     System.out.println();

   }

   sc.close();

 }

}

Output for the above program

Enter the number of rows for pattern:  6

        A 

       A B 

      A B C 

     A B C D 

    A B C D E 

   A B C D E F 

  A B C D E F G 

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