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.
List of Source Code
Code to print triangles using *, digits and characters
Code to print inverted triangles using * and digits
Code to print full pyramids
Code to print Pascal's triangle
Code to print Floyd's triangle

Programs to print triangles using *, numbers and characters


Example 1: Program to print half pyramid using *

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

Source code

public class Pattern {

    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();
        }
    }
}

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 Pattern {

    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();
        }
    }
}

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 Pattern {

    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


Example 4: Inverted half pyramid using *

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

Source Code

public class Pattern {

    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();
        }
    }
}

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 Pattern {

    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();
        }
    }
}

 Programs to display pyramid and inverted pyramid using * and digits


Example 6: Program to print full pyramid using *

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

Source Code

public class Pattern {

    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();
        }
    }
}

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 Pattern {

    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();
        }
    }
}

Example 8: Inverted full pyramid using *


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

Source Code

public class Pattern {

    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();
        }
    }
}

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 Pattern {

    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();
        }
    }
}

Example 10: Print Floyd's Triangle.

1
2 3
4 5 6
7 8 9 10

Source Code

public class Pattern {

    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();
        }
    }
}