Number Pattern Programs in Java

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Associate Senior Executive

Updated on Oct 3, 2023 11:33 IST

Pattern programs in Java are a type of problem that use nested loops to produce different patterns of numbers, stars (*), or other characters. In this blog we will dive deeper specifically into number pattern programs in java.

Number pattern programs in Java display a sequence of numbers in certain patterns. These programs are often used as a practical exercise for learning loop control structures in Java (i.e., for loops, while loops, and do-while loops). The patterns could be anything from a simple pyramid shape to more complex combinations and sequences of numbers.

Explore Pattern Programs in C

Why Are Number Pattern Programs Important?

Understanding Control Structures: Helps understanding and mastering the use of loops and control structures.
Problem-Solving Skills: Enhances logical thinking and problem-solving skills.
Attention to Detail: Improves attention to detail by focusing on precise pattern generation.
Preparation for Interviews: Commonly used in coding interviews and assessments.

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Basic Approach to Solve a Number Pattern Program Using an Example

Step 1: Understand the Pattern

Visualize the Pattern: Observe the pattern to understand its structure.
Identify the Number of Rows and Columns: Determine the number of rows and columns in the pattern.
Analyze the Sequence: Understand how the numbers are arranged in each row and column.

Example Pattern

Step 2: Initialize the Program

Start the Class and Main Method: Initialize your Java program with a class and a main method.

public class Main {
    public static void main(String[] args) {
        // Code goes here
    }
}
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Step 3: Determine and Set the Number of Rows

Set the Number of Rows: Determine how many rows the pattern will have.

int n = 4; // The pattern has 4 rows
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Step 4: Construct an Outer Loop for Rows

Create the Outer Loop: Set up an outer loop to iterate through the rows.

for (int i = 1; i <= n; i++) {
    // Inner loops will go here
}
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Step 5: Construct Inner Loops for Columns

Create Inner Loops for Columns: Utilize inner loops to manage the columns and print the numbers.

for (int j = n; j >= 1; j--) {
    if (j <= i) {
        System.out.print(j);
    } else {
        System.out.print(" ");
    }
}
for (int k = 2; k <= i; k++) {
    System.out.print(k);
}
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Step 6: Combine and Execute the Code

Combine All Code Segments: Combine all parts and run the program to print the pattern.

public class Main {
    public static void main(String[] args) {
        int n = 4;
        for (int i = 1; i <= n; i++) {
            for (int j = n; j >= 1; j--) {
                if (j <= i) {
                    System.out.print(j);
                } else {
                    System.out.print(" ");
                }
            }
            for (int k = 2; k <= i; k++) {
                System.out.print(k);
            }
            System.out.println();
        }
    }
}
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Following the above steps, you can systematically approach and solve any number pattern program in Java.

Top 10 Number Pattern Programs in Java

Right-Angle Triangle Pattern
Inverted Right-Angle Triangle Pattern
Pyramid Number Pattern
Inverted Pyramid Number Pattern
Diamond Number Pattern
Hollow Diamond Number Pattern
Pascal’s Triangle Pattern
Floyd’s Triangle Pattern
Palindromic Number Pattern
Binary Number Pyramid Pattern

Let’s understand each of these one by one in detail :

Right-Angle Triangle Pattern: A simple pattern where each row contains increasing consecutive numbers.

Code

public class Main {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
}
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Inverted Right-Angle Triangle Pattern: Similar to the right-angle triangle pattern but inverted.

Code

public class Main{
    public static void main(String[] args) {
        for (int i = 5; i >= 1; i--) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
}
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Pyramid Number Pattern: A pattern of numbers arranged in the form of a pyramid.

Code

public class Main {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n - i; j++) {
                System.out.print(" ");
            }
            for (int k = 0; k <= i; k++) {
                System.out.print(k + 1);
            }
            for (int l = i - 1; l >= 0; l--) {
                System.out.print(l + 1);
            }
            System.out.println();
        }
    }
}
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Inverted Pyramid Number Pattern: An inverted version of the pyramid number pattern.

Code

public class Main {
    public static void main(String[] args) {
        int n = 5;
        for (int i = n; i >= 1; i--) {
            for (int j = n; j > i; j--) {
                System.out.print(" ");
            }
            for (int k = 1; k < (i * 2); k++) {
                System.out.print(k);
            }
            System.out.println();
        }
    }
}
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Diamond Number Pattern: A pattern where numbers are arranged in a diamond shape.

Code

public class Main {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 1; i <= n; i++) {
            for (int j = i; j < n; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k < (i * 2); k++) {
                System.out.print(k);
            }
            System.out.println();
        }
        for (int i = n - 1; i >= 1; i--) {
            for (int j = n; j > i; j--) {
                System.out.print(" ");
            }
            for (int k = 1; k < (i * 2); k++) {
                System.out.print(k);
            }
            System.out.println();
        }
    }
}
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Hollow Diamond Number Pattern: A diamond-shaped pattern with numbers on the border and hollow inside.

Code

public class Main {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 1; i <= n; i++) {
            for (int j = i; j < n; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <= (2 * i - 1); k++) {
                if (k == 1 || k == (2 * i - 1)) {
                    System.out.print(1);
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
        for (int i = n - 1; i >= 1; i--) {
            for (int j = n; j > i; j--) {
                System.out.print(" ");
            }
            for (int k = 1; k <= (2 * i - 1); k++) {
                if (k == 1 || k == (2 * i - 1)) {
                    System.out.print(1);
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
}
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Pascal’s Triangle Pattern: A triangular pattern where each number is the sum of the two numbers directly above it.

Code

public class Main {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 0; i < n; i++) {
            int number = 1;
            for (int j = 0; j < n - i; j++) {
                System.out.print(" ");
            }
            for (int k = 0; k <= i; k++) {
                System.out.print(number + " ");
                number = number * (i - k) / (k + 1);
            }
            System.out.println();
        }
    }
}
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Floyd’s Triangle Pattern: A right-angle triangle pattern with consecutive numbers.

Code

public class Main {
    public static void main(String[] args) {
        int n = 4, number = 1;
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(number + " ");
                number++;
            }
            System.out.println();
        }
    }
}
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Palindromic Number Pattern: A pattern where numbers are the same in a row forwards and backward.

Code

public class Main {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 1; i <= n; i++) {
            for (int j = i; j < n; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k < i; k++) {
                System.out.print(k);
            }
            for (int l = i; l >= 1; l--) {
                System.out.print(l);
            }
            System.out.println();
        }
    }
}
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Binary Number Pyramid Pattern: A pyramid pattern of binary numbers (0 and 1).

Code

public class Main {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 0; i < n; i++) {
            for (int j = n - 1; j > i; j--) {
                System.out.print(" ");
            }
            for (int k = 0; k <= i; k++) {
                System.out.print((k % 2) + " ");
            }
            System.out.println();
        }
    }
}
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Conclusion

Thus, number pattern programs in Java are an essential part of foundational programming learning and practice. They not only help in understanding the use and manipulation of loops and control statements, but also enhance logical thinking and problem-solving skills.

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About the Author

Esha Gupta

Associate Senior Executive

I'm Esha Gupta, a B.Tech graduate in Computer Science & Engineering, specializing in Front End Web Dev. I've interned at GeeksforGeeks & Coding Minutes, fueling my passion for crafting appealing and functional digit... Read Full Bio

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Number Pattern Programs in Java

Why Are Number Pattern Programs Important?

Basic Approach to Solve a Number Pattern Program Using an Example

Step 1: Understand the Pattern

Example Pattern

Step 2: Initialize the Program

Step 3: Determine and Set the Number of Rows

Step 4: Construct an Outer Loop for Rows

Step 5: Construct Inner Loops for Columns

Step 6: Combine and Execute the Code

Top 10 Number Pattern Programs in Java

Let’s understand each of these one by one in detail :

Conclusion

Comments

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