In this article, we will learn to print the different Pattern Programs in Java, it is the most famous interview question as it tests our logical skills and understanding of flow control.
Let’s look into the below possible Pattern Programs in Java which includes Number patterns, Star patterns, and Alphabet patterns.
Pattern Programs In Java
Pattern 1:
package com.javainterviewpoint;
public class Pattern1
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5
Pattern 2:
package com.javainterviewpoint;
public class Pattern2
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print((char)(alphabet + j -1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## A A B A B C A B C D A B C D E
Pattern 3:
package com.javainterviewpoint;
public class Pattern3
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## * * * * * * * * * * * * * * *
Pattern 4:
package com.javainterviewpoint;
public class Pattern4
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(i + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 2 2 3 3 3 4 4 4 4 5 5 5 5 5
Pattern 5:
package com.javainterviewpoint;
public class Pattern5
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print((char)(alphabet + i -1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## A B B C C C D D D D E E E E E
Pattern 6:
package com.javainterviewpoint;
public class Pattern6
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
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("* ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
*
* *
* * *
* * * *
* * * * *
Pattern 7:
package com.javainterviewpoint;
public class Pattern7
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
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();
}
}
}
Output
## Printing the pattern ##
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Pattern 8:
package com.javainterviewpoint;
public class Pattern8
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j < i; j++)
{
System.out.print(" ");
}
for (int k = i; k <= rows; k++)
{
System.out.print(k + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
5
4 5
3 4 5
2 3 4 5
1 2 3 4 5
Pattern 9:
package com.javainterviewpoint;
public class Pattern9
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
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((char) (alphabet + k - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
A
A B
A B C
A B C D
A B C D E
Pattern 10:
package com.javainterviewpoint;
public class Pattern10
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j <= i; j++)
{
System.out.print(" ");
}
for (int k = i; k <= 5; k++)
{
System.out.print((char) (alphabet + k - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
E
D E
C D E
B C D E
A B C D E
Pattern 11:
package com.javainterviewpoint;
public class Pattern11
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = rows; j > i; j--)
{
System.out.print(" ");
}
for (int k = 1; k <= (i * 2) - 1; k++)
{
System.out.print("*");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
*
***
*****
*******
*********
Pattern 12:
package com.javainterviewpoint;
public class Pattern12
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
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(i + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
Pattern 13:
package com.javainterviewpoint;
public class Pattern13
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
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((char) (alphabet + i - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
A
B B
C C C
D D D D
E E E E E
Pattern 14:
package com.javainterviewpoint;
public class Pattern14
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1
Pattern 15:
package com.javainterviewpoint;
public class Pattern15
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = rows; j >= i; j--)
{
System.out.print(j + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 5 4 3 2 1 5 4 3 2 5 4 3 5 4 5
Pattern 16:
package com.javainterviewpoint;
public class Pattern16
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = rows; j >= i; j--)
{
System.out.print(j + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 5 5 4 5 4 3 5 4 3 2 5 4 3 2 1
Pattern 17:
package com.javainterviewpoint;
public class Pattern17
{
public static void main(String[] args)
{
int rows = 5;
int temp = 1;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(temp + " ");
temp++;
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Pattern 18:
package com.javainterviewpoint;
public class Pattern18
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j <= i; j++)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## A B C D E A B C D A B C A B A
Pattern 19:
package com.javainterviewpoint;
public class Pattern19
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = rows; j >= i; j--)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## E D C B A E D C B E D C E D E
Pattern 20:
package com.javainterviewpoint;
public class Pattern20
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = rows; j >= i; j--)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## E E D E D C E D C B E D C B A
Pattern 21:
package com.javainterviewpoint;
public class Pattern21
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print((char) (alphabet) + " ");
alphabet++;
}
System.out.println();
}
}
}
Output
## Printing the pattern ## A B C D E F G H I J K L M N O
Pattern 22:
package com.javainterviewpoint;
public class Pattern22
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
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();
}
}
}
Output
## Printing the pattern ##
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
Pattern 23:
package com.javainterviewpoint;
public class Pattern23
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
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((char) (alphabet - 1 + temp) + " ");
temp = temp * (i - k) / (k);
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
A
A A
A B A
A C C A
A D F D A
Pattern 24:
package com.javainterviewpoint;
public class Pattern24
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j + " ");
}
System.out.println();
}
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j < i; j++)
{
System.out.print(j + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1
Pattern 25:
package com.javainterviewpoint;
public class Pattern25
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j <= i - 1; j++)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## A A B A B C A B C D A B C D E A B C D A B C A B A
Pattern 26:
package com.javainterviewpoint;
public class Pattern26
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print("* ");
}
System.out.println();
}
for (int i = 1; i <= rows - 1; i++)
{
for (int j = rows - 1; j >= i; j--)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## * * * * * * * * * * * * * * * * * * * * * * * * *
Pattern 27:
package com.javainterviewpoint;
public class Pattern27
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
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("* ");
}
System.out.println();
}
for (int i = 1; i <= rows - 1; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(" ");
}
for (int k = rows - 1; k >= i; k--)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
*
* *
* * *
* * * *
* * * * *
* * * *
* * *
* *
*
Pattern 28:
package com.javainterviewpoint;
public class Pattern28
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j + " ");
}
System.out.println();
}
for (int i = 2; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5
Pattern 29:
package com.javainterviewpoint;
public class Pattern29
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = i; j >= 1; j--)
{
System.out.print(j + " ");
}
System.out.println();
}
for (int i = 2; i <= rows; i++)
{
for (int j = i; j >= 1; j--)
{
System.out.print(j + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 5 4 3 2 1 4 3 2 1 3 2 1 2 1 1 2 1 3 2 1 4 3 2 1 5 4 3 2 1
Pattern 30:
package com.javainterviewpoint;
public class Pattern30
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = 1; j <= i; j++)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
for (int i = 2; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## A B C D E A B C D A B C A B A A B A B C A B C D A B C D E
Pattern 31:
package com.javainterviewpoint;
public class Pattern31
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = i; j >= 1; j--)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
for (int i = 2; i <= rows; i++)
{
for (int j = i; j >= 1; j--)
{
System.out.print((char) (alphabet + j - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## E D C B A D C B A C B A B A A B A C B A D C B A E D C B A
Pattern 32:
package com.javainterviewpoint;
public class Pattern32
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = rows; i >= 1; i--)
{
for (int j = i; j >= 1; j--)
{
System.out.print("* ");
}
System.out.println();
}
for (int i = 2; i <= rows; i++)
{
for (int j = i; j >= 1; j--)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Pattern 33:
package com.javainterviewpoint;
public class Pattern33
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
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 + " ");
}
for (int l = i - 1; l >= 1; l--)
{
System.out.print(l + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
1
1 2 1
1 2 3 2 1
1 2 3 4 3 2 1
1 2 3 4 5 4 3 2 1
Pattern 34:
package com.javainterviewpoint;
public class Pattern34
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
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((char) (alphabet + k - 1) + " ");
}
for (int l = i - 1; l >= 1; l--)
{
System.out.print((char) (alphabet + l - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
A
A B A
A B C B A
A B C D C B A
A B C D E D C B A
Pattern 35:
package com.javainterviewpoint;
public class Pattern35
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j < i; j++)
{
System.out.print("0 ");
}
System.out.print(i + " ");
for (int k = i; k < rows; k++)
{
System.out.print("0 ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 0 0 0 0 0 2 0 0 0 0 0 3 0 0 0 0 0 4 0 0 0 0 0 5
Pattern 36:
package com.javainterviewpoint;
public class Pattern36
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = rows; j > i; j--)
{
System.out.print(1 + " ");
}
for (int k = 1; k <= i; k++)
{
System.out.print(i + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## 1 1 1 1 1 1 1 1 2 2 1 1 3 3 3 1 4 4 4 4 5 5 5 5 5
Pattern 37:
package com.javainterviewpoint;
public class Pattern37
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = rows; j > i; j--)
{
System.out.print((char) (alphabet) + " ");
}
for (int k = 1; k <= i; k++)
{
System.out.print((char) (alphabet + i - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ## A A A A A A A A B B A A C C C A D D D D E E E E E
Pattern 38:
package com.javainterviewpoint;
public class Pattern38
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
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();
}
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(" ");
}
for (int k = 1; k <= rows - i; k++)
{
System.out.print(k + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
Pattern 39:
package com.javainterviewpoint;
public class Pattern39
{
public static void main(String[] args)
{
int alphabet = 65;
int rows = 5;
System.out.println("## Printing the pattern ##");
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((char) (alphabet + k - 1) + " ");
}
System.out.println();
}
for (int i = 1; i <= rows; i++)
{
for (int j = 0; j <= i; j++)
{
System.out.print(" ");
}
for (int k = 1; k <= rows - i; k++)
{
System.out.print((char) (alphabet + k - 1) + " ");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
A
A B
A B C
A B C D
A B C D E
A B C D
A B C
A B
A
Pattern 40:
package com.javainterviewpoint;
public class Pattern40
{
public static void main(String[] args)
{
int rows = 5;
System.out.println("## Printing the pattern ##");
for (int i = 1; i <= rows; i++)
{
for (int j = rows; j > i; j--)
{
System.out.print(" ");
}
for (int k = 1; k <= (i * 2) - 1; k++)
{
System.out.print("*");
}
System.out.println();
}
for (int i = rows - 1; i >= 1; i--)
{
for (int j = rows - 1; j >= i; j--)
{
System.out.print(" ");
}
for (int k = 1; k <= (i * 2) - 1; k++)
{
System.out.print("*");
}
System.out.println();
}
}
}
Output
## Printing the pattern ##
*
***
*****
*******
*********
*******
*****
***
*
Do let me know the patterns that need to be added in the comments. Happy Learning !! 🙂
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