Java Code To Create Pyramid and Pattern

In this program, you'll learn to create pyramid, half pyramid, inverted pyramid, Pascal's triangle and Floyd's triangle sing control statements in Java.

To understand this example, you should have the knowledge of the following Java programming topics:

• Java for Loop
• Java if...else Statement
• Java while and do...while Loop

Programs to print triangles using *, numbers, and characters

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Example 1: Program to print half pyramid using *

*
* *
* * *
* * * *
* * * * *

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 5;

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

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Example 2: Program to print half pyramid a using numbers

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 5;

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

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Example 3: Program to print half pyramid using alphabets

A
B B
C C C
D D D D
E E E E E

Source Code

public class Main {

  public static void main(String[] args) {
    char last = 'E', alphabet = 'A';

    for (int i = 1; i <= (last - 'A' + 1); ++i) {
      for (int j = 1; j <= i; ++j) {
        System.out.print(alphabet + " ");
      }
      ++alphabet;

      System.out.println();
    }
  }
}

Programs to print inverted half pyramid using * and numbers

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Example 4: Inverted half pyramid using *

* * * * *
* * * *
* * * 
* *
*

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 5;

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

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Example 5: Inverted half pyramid using numbers

1 2 3 4 5
1 2 3 4 
1 2 3
1 2
1

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 5;

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

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Programs to display pyramid and inverted pyramid using * and digits

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Example 6: Program to print full pyramid using *

        *
      * * *
    * * * * *
  * * * * * * *
* * * * * * * * *

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 5, k = 0;

    for (int i = 1; i <= rows; ++i, k = 0) {
      for (int space = 1; space <= rows - i; ++space) {
        System.out.print("  ");
      }

      while (k != 2 * i - 1) {
        System.out.print("* ");
        ++k;
      }

      System.out.println();
    }
  }
}

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Example 7: Program to print pyramid using numbers

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

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 5, k = 0, count = 0, count1 = 0;

    for (int i = 1; i <= rows; ++i) {
      for (int space = 1; space <= rows - i; ++space) {
        System.out.print("  ");
        ++count;
      }

      while (k != 2 * i - 1) {
        if (count <= rows - 1) {
          System.out.print((i + k) + " ");
          ++count;
        } else {
          ++count1;
          System.out.print((i + k - 2 * count1) + " ");
        }

        ++k;
      }
      count1 = count = k = 0;

      System.out.println();
    }
  }
}

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Example 8: Inverted full pyramid using *

* * * * * * * * *
  * * * * * * *
    * * * * *
      * * *
        *

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 5;

    for(int i = rows; i >= 1; --i) {
      for(int space = 1; space <= rows - i; ++space) {
        System.out.print("  ");
      }

      for(int j=i; j <= 2 * i - 1; ++j) {
        System.out.print("* ");
      }

      for(int j = 0; j < i - 1; ++j) {
        System.out.print("* ");
      }

      System.out.println();
    }
  }
}

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Example 9: Print Pascal's triangle

           1
         1   1
       1   2   1
     1   3   3    1
   1   4   6   4   1
 1   5   10   10  5   1

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 6, coef = 1;

    for(int i = 0; i < rows; i++) {
      for(int space = 1; space < rows - i; ++space) {
        System.out.print("  ");
      }

      for(int j = 0; j <= i; j++) {
        if (j == 0 || i == 0)
          coef = 1;
        else
          coef = coef * (i - j + 1) / j;

        System.out.printf("%4d", coef);
      }

      System.out.println();
    }
  }
}

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Example 10: Print Floyd's Triangle.

1
2 3
4 5 6
7 8 9 10

Source Code

public class Main {

  public static void main(String[] args) {
    int rows = 4, number = 1;

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

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

      System.out.println();
    }
  }
}

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