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February 18, 2022 12:11 pm GMT

Star Pattern In Java

Recently i was learning Java programming and while practicing some of the fundamentals i created some star patterns.

Working with pattern program in Java helped me think clearly the flow and working of fundamentals like if-else and loops.

1. Square star pattern

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

Here is code to create it:

class squarePattern {  public static void main(String[] args) {    // size of the square    int size = 5;    // outer loop    for (int i = 0; i < size; i++) {      // inner loop      for (int j = 0; j < size; j++) {        System.out.print("*");      }      System.out.println();    }  }}

2. Left triangle star pattern

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

Here is the code to create it.

class leftTrianlge {  public static void main(String[] args) {    // size of the triangle    int size = 5;    // loop to print the pattern    for (int i = 0; i < size; i++) {      // print column      for (int j = 0; j <= i; j++) {        System.out.print("*");      }      System.out.println();    }  }}

3. Left triangle star pattern

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

Here is the code:

class rightTrianlge {  public static void main(String[] args) {    // size of the triangle    int size = 5;    // loop to print the pattern    for (int i = 0; i < size; i++) {      // print spaces      for (int j = 1; j < size - i; j++) {        System.out.print(" ");      }      // print stars      for (int k = 0; k <= i; k++) {        System.out.print("*");      }      System.out.println();    }  }}

4. Pyramid star pattern in Java

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

Here is complete code for this:

class pyramid {  // pyramid star pattern  public static void main(String[] args) {    int size = 5;    for (int i = 0; i < size; i++) {      // print spaces      for (int j = 0; j < size - i - 1; j++) {        System.out.print(" ");      }      // print stars      for (int k = 0; k < 2 * i + 1; k++) {        System.out.print("*");      }      System.out.println();    }  }}

5. Hollow pyramid pattern

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

Here is complete code:

class hollowPyramid {  public static void main(String[] args) {    // size of the pyramid    int size = 5;    for (int  i = 0; i < size; i++) {      // print spaces      for (int j = 0; j < size - i - 1; j++) {        System.out.print(" ");      }      // print stars      for (int k = 0; k < 2 * i + 1; k++) {        if (i == 0 || i == size - 1) {          System.out.print("*");        }        else {          if (k == 0 || k == 2 * i) {            System.out.print("*");          }          else {            System.out.print(" ");          }        }      }      System.out.println();    }  }}

6. Diamond star pattern

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

Here is complete code:

class diamond {  public static void main(String[] args) {    int size = 5;    // upside pyramid    for (int i = 1; i <= size; i++) {      // printing spaces      for (int j = size; j > i; j--) {        System.out.print(" ");      }      // printing star      for (int k = 0; k < i * 2 - 1; k++) {        System.out.print("*");      }      System.out.println();    }    // downside pyramid    for (int i = 1; i <= size - 1; i++) {      // printing spaces      for (int j = 0; j < i; j++) {        System.out.print(" ");      }      // printing star      for (int k = (size - i) * 2 - 1; k > 0; k--) {        System.out.print("*");      }      System.out.println();    }  }}

7. Hourglass pattern

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

Here is complete code for this:

class hourGlass {  public static void main(String[] args) {    int size = 5;    // reversed pyramid star pattern    for (int i = 0; i < size; i++) {      // printing spaces      for (int j = 0; j < i; j++) {        System.out.print(" ");      }      // printing star      for (int k = 0; k < (size - i) * 2 - 1; k++) {        System.out.print("*");      }      System.out.println();    }    // pyramid star pattern    for (int i = 2; i <= size; i++) {      // printing spaces      for (int j = size; j > i; j--) {        System.out.print(" ");      }      // printing star      for (int k = 0; k < i * 2 - 1; k++) {        System.out.print("*");      }      System.out.println();    }  }}

8. Heart pattern

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

Here is complete code:

class heart {  public static void main(String[] args) {    // heart star pattern    int size = 6;    for (int i = size / 2; i < size; i += 2) {      // print first spaces      for (int j = 1; j < size - i; j += 2) {        System.out.print(" ");      }      // print first stars      for (int j = 1; j < i + 1; j++) {        System.out.print("*");      }      // print second spaces      for (int j = 1; j < size - i + 1; j++) {        System.out.print(" ");      }      // print second stars      for (int j = 1; j < i + 1; j++) {        System.out.print("*");      }      System.out.println();    }    // lower part    // inverted pyramid    for (int i = size; i > 0; i--) {      for (int j = 0; j < size - i; j++) {        System.out.print(" ");      }      for (int j = 1; j < i * 2; j++) {        System.out.print("*");      }      System.out.println();    }  }}

Reference: Tutorials Tonight

Original Link: https://dev.to/satish538/star-pattern-in-java-53h0

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