Number pattern programs in Java

In this post, you will learn how to print various number pattern programs using Java programming. Such type of logical question is generally asked in an interview or in competitive exams. This can be helpful to improve your logical programming skill and helpful in game development and other logical application development.

A pattern program consists of patterns of numbers, letters, symbols in a particular form. In the programming language, the loop condition is considered important for printing patterns. Generally, nested for loops is used in number of patterns and shapes printing programs.

Java number pattern program 1

Suppose someone asks you to print the following number pattern using Java.

Number pattern : 
1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 
1 2 3 4 5 6 
1 2 3 4 5 6 7 
1 2 3 4 5 6 7 8 

The solution is as follows.

public class MainClass
{
    public static void main(String[] args) 
    {
         
        // defining pattern rows
        int rows = 8;
         
        System.out.println("Number pattern : ");
         
        for (int x = 1; x <= rows; x++) 
        {
            for (int y = 1; y <= x; y++)
            {
                System.out.print(y+" ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 2

Suppose we have to print repeated number patterns of up to eight rows as shown below.

Number pattern : 
1 
2 2 
3 3 3 
4 4 4 4 
5 5 5 5 5 
6 6 6 6 6 6 
7 7 7 7 7 7 7 
8 8 8 8 8 8 8 8 

The Java programming solution of the above pattern is as follows. This number pattern program uses the nested for loops.

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
         
        // defining pattern rows
        int rows = 8;
         
        System.out.println("Number pattern : ");
         
        for (int i = 1; i <= rows; i++) 
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(i+" ");
            }
             
            System.out.println();
        }
    }
}

Java number pattern program 3

Suppose someone asks you to print the following number pattern using Java.

1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 
1 2 3 4 5 6 
1 2 3 4 5 6 7 
1 2 3 4 5 6 7 8 
1 2 3 4 5 6 7 
1 2 3 4 5 6 
1 2 3 4 5 
1 2 3 4 
1 2 3 
1 2 
1 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
         
        // defining pattern rows
        int rows = 8;
        
        //Printing upper half of the pattern
        for (int i = 1; i <= rows; i++) 
        {
            for (int j = 1; j <= i; j++) 
            { 
                System.out.print(j+" "); 
            } 
            // Printing space
            System.out.println(); 
        } 
         
        //Printing lower half of the pattern 
        for (int i = rows-1; i >= 1; i--)
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(j+" ");
            }
            // Printing space 
            System.out.println();
        }
         
    }
}

Java number pattern program 4

Suppose someone asks you to print the following reverse triangle shape number pattern program using Java.

1 2 3 4 5 6 7 8 
1 2 3 4 5 6 7 
1 2 3 4 5 6 
1 2 3 4 5 
1 2 3 4 
1 2 3 
1 2 
1 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 8;
        
        for (int i = rows; i >= 1; i--) 
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(j+" ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 5

Suppose someone asks you to print the following k shape number pattern program using Java.

1 2 3 4 5 6 7 8 
1 2 3 4 5 6 7 
1 2 3 4 5 6 
1 2 3 4 5 
1 2 3 4 
1 2 3 
1 2 
1 
1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 
1 2 3 4 5 6 
1 2 3 4 5 6 7 
1 2 3 4 5 6 7 8 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 8;
        
        for (int i = rows; i >= 1; i--)
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(j + " ");
            }
            System.out.println();
        }

        for (int i = 1; i <= rows; i++)
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 6

Suppose someone asks you to print the following triangle shape number pattern program using Java.

      1 
     1 2 
    1 2 3 
   1 2 3 4 
  1 2 3 4 5 
 1 2 3 4 5 6 
1 2 3 4 5 6 7 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 7;
        
        for (int i = 1; i <= rows; i++)
        {
            for (int j = rows; j > i; j--)
            {
                System.out.print(" ");
            }
            for (int k = 1; k <= i; k++)
            {
                System.out.print(k + " ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 7

Suppose someone asks you to print the following triangle shape number pattern program using Java.

7 
7 6 
7 6 5 
7 6 5 4 
7 6 5 4 3 
7 6 5 4 3 2 
7 6 5 4 3 2 1 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 7;
        
        for (int i = rows; i >= 1; i--)
        {
            for (int j = rows; j >= i; j--)
            {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 8

Suppose someone asks you to print the following triangle shape number pattern program using Java.

1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15 
16 17 18 19 20 21 
22 23 24 25 26 27 28 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 7;
        int k = 1;
        
        for (int i = 1; i <= rows; i++)
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(k + " ");
                k++;
            }
            System.out.println();
        }
    }
}

Java number pattern program 9

Suppose someone asks you to print the following number pattern program using Java.

1 
2 2 
3 3 3 
4 4 4 4 
5 5 5 5 5 
6 6 6 6 6 6 
7 7 7 7 7 7 7 
8 8 8 8 8 8 8 8 
9 9 9 9 9 9 9 9 9 
10 10 10 10 10 10 10 10 
11 11 11 11 11 11 11 
12 12 12 12 12 12 
13 13 13 13 13 
14 14 14 14 
15 15 15 
16 16 
17 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 9;
        
        int temp = 1;
        for (int i = 1; i <= rows; i++)
        {
            for (int k = 1; k <= i; k++)
            {
                System.out.print(temp + " ");
            }
            temp++;
            System.out.println();
        }

        for (int i = rows - 1; i >= 1; i--)
        {
            for (int k = i; k >= 1; k--)
            {
                System.out.print(temp + " ");
            }
            temp++;
            System.out.println();
        }
    }
}

Java number pattern program 10

Suppose someone asks you to print the following triangle shape number pattern program using Java.

1 
2 1 
3 2 1 
4 3 2 1 
5 4 3 2 1 
6 5 4 3 2 1 
7 6 5 4 3 2 1 
8 7 6 5 4 3 2 1 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 8;
        
        for (int i = 1; i <= rows; i++)
        {
            for (int j = i; j >= 1; j--)
            {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 11

Suppose someone asks you to print the following triangle shape number pattern program using Java.

       1 
      1 1 
     1 2 1 
    1 3 3 1 
   1 4 6 4 1 
  1 5 10 10 5 1 
 1 6 15 20 15 6 1 
1 7 21 35 35 21 7 1 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 8;
        
        for (int i = 1; i <= rows; i++)
        {
            for (int j = rows; j > i; j--)
            {
                System.out.print(" ");
            }

            int temp = 1;
            for (int k = 1; k <= i; k++)
            {
                System.out.print(temp + " ");
                temp = temp * (i - k) / (k);
            }
            System.out.println();
        }
    }
}

Java number pattern program 12

Suppose someone asks you to print the following reverse triangle shape number pattern program using Java.

1 2 3 4 5 6 7 8 9 
 1 2 3 4 5 6 7 8 
  1 2 3 4 5 6 7 
   1 2 3 4 5 6 
    1 2 3 4 5 
     1 2 3 4 
      1 2 3 
       1 2 
        1 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 9;
        
        for (int i = 1; i <= rows; i++)
        {
            for (int j = 1; j < i; j++)
            {
                System.out.print(" ");
            }
            for (int k = 1; k <= rows - i + 1; k++)
            {
                System.out.print(k + " ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 13

Suppose someone asks you to print the following square shape number pattern program using Java.

1 2 3 4 5 6 7 8 9 
2 3 4 5 6 7 8 9 1 
3 4 5 6 7 8 9 1 2 
4 5 6 7 8 9 1 2 3 
5 6 7 8 9 1 2 3 4 
6 7 8 9 1 2 3 4 5 
7 8 9 1 2 3 4 5 6 
8 9 1 2 3 4 5 6 7 
9 1 2 3 4 5 6 7 8 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 9;
        
        for(int i=1;i< rows+1 ;i++)
        {
            for(int j=i; j < rows+1 ;j++)
            {
                System.out.print(j + " ");
            }
            for(int k=1; k < i ;k++)
            {
                System.out.print(k + " ");
            }
            System.out.println();
        }
    }
}

Java number pattern program 14

Suppose someone asks you to print the following triangle shape number pattern program using Java.

1 
2 10 
3 11 18 
4 12 19 25 
5 13 20 26 31 
6 14 21 27 32 36 
7 15 22 28 33 37 40 
8 16 23 29 34 38 41 43 
9 17 24 30 35 39 42 44 45 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 9;
        
        for (int i = 1; i <= rows; i++) 
        {
            int num = i;
             
            for (int j = 1; j <= i; j++) 
            {
                System.out.print(num+" ");
                 
                num = num+rows-j;
            }
             
            System.out.println();
        }
    }
}

Java number pattern program 15

Suppose someone asks you to print the following triangle shape number pattern program using Java.

1 
2 13 
3 12 14 
4 11 15 22 
5 10 16 21 23 
6 9 17 20 24 27 
7 8 18 19 25 26 28 

The solution is as follows -

public class NumberPatternProgram
{
    public static void main(String[] args) 
    {
        // defining pattern rows
        int rows = 7;
        
        for(int i=1 ; i <= rows ; i++)  
        {
            System.out.print(i + " ");
            int n = i;
            for(int j = 1; j < i ; j++)
            {
                if(j%2 != 0)
                {
                    System.out.print((n + ((2 * (rows + 1 - i)) - 1)) + " ");
                    n = n + ((2 * (rows + 1 - i)) - 1);
                }
                else
                {
                    System.out.print((n + 2 * (i - j)) + " ");
                    n = n + 2 * (i - j);
                }
            }
            System.out.println();
        }    
    }
}

Related Articles