Java Code To Create Pyramid and Pattern

最新推荐文章于 2025-08-03 02:16:33 发布

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本文详细介绍如何使用Java控制语句打印各种图案，包括金字塔、倒金字塔、帕斯卡三角形及弗洛伊德三角形等。通过示例代码，读者可以学习如何用星号、数字和字母创建不同的图案。

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.

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

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

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.

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();
        }
    }
}