The Art of Star Patterns
Star patterns are aesthetically pleasing geometric arrangements of stars or asterisks. These patterns are not only visually appealing but also fun to create programmatically. In Apex, we can use loops and conditional statements to generate various types of star patterns.
Creating Star Patterns in Apex
Let’s dive into creating star patterns in Apex with some examples:
Example 1: Right Triangle Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*
**
***
****
*****
Example 2: Diamond Star Pattern
Integer n = 5; // Number of rows
Integer mid = (n + 1) / 2;
for (Integer i = 1; i <= mid; i++) {
for (Integer j = 1; j <= mid - i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
System.debug('*');
}
System.debug('');
}
for (Integer i = mid - 1; i >= 1; i--) {
for (Integer j = 1; j <= mid - i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*
***
*****
***
*
Example 3: Inverted Right Triangle Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = n; j >= i; j--) {
System.debug('*');
}
System.debug('');
}
Output:
*****
****
***
**
*
Example 4: Pyramid Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = n; j > i; j--) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*
***
*****
*******
*********
Example 5: Hollow Pyramid Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = n; j > i; j--) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
if (j == 1 || j == 2 * i - 1 || i == n) {
System.debug('*');
} else {
System.debug(' ');
}
}
System.debug('');
}
Output:
*
* *
* *
* *
*********
Example 6: Diamond Star Pattern
Integer n = 5; // Number of rows
Integer mid = (n + 1) / 2;
for (Integer i = 1; i <= mid; i++) {
for (Integer j = 1; j <= mid - i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
System.debug('*');
}
System.debug('');
}
for (Integer i = mid - 1; i >= 1; i--) {
for (Integer j = 1; j <= mid - i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*
***
*****
***
*
Example 7: Hollow Diamond Star Pattern
Integer n = 5; // Number of rows
Integer mid = (n + 1) / 2;
for (Integer i = 1; i <= mid; i++) {
for (Integer j = 1; j <= mid - i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
if (j == 1 || j == 2 * i - 1) {
System.debug('*');
} else {
System.debug(' ');
}
}
System.debug('');
}
for (Integer i = mid - 1; i >= 1; i--) {
for (Integer j = 1; j <= mid - i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
if (j == 1 || j == 2 * i - 1) {
System.debug('*');
} else {
System.debug(' ');
}
}
System.debug('');
}
Output:
*
* *
* *
* *
*
Example 8: Half Pyramid Star Pattern (Right-aligned)
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = n; j > i; j--) {
System.debug(' ');
}
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*
**
***
****
*****
Example 9: Half Pyramid Star Pattern (Left-aligned)
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*
**
***
****
*****
Example 10: Pyramid Star Pattern (Upside-down)
Integer n = 5; // Number of rows
for (Integer i = n; i >= 1; i--) {
for (Integer j = 1; j <= n - i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * i - 1; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*****
****
***
**
*
Example 11: Hollow Rectangle Star Pattern
Integer rows = 5; // Number of rows
Integer columns = 8; // Number of columns
for (Integer i = 1; i <= rows; i++) {
for (Integer j = 1; j <= columns; j++) {
if (i == 1 || i == rows || j == 1 || j == columns) {
System.debug('*');
} else {
System.debug(' ');
}
}
System.debug('');
}
Output:
********
* *
* *
* *
********
Example 12: Diagonal Line of Stars
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = 1; j <= n; j++) {
if (i == j) {
System.debug('*');
} else {
System.debug(' ');
}
}
System.debug('');
}
Output:
*****
****
***
**
*
Example 13: Butterfly Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
for (Integer j = 1; j <= 2 * (n - i); j++) {
System.debug(' ');
}
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
System.debug('');
}
for (Integer i = n; i >= 1; i--) {
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
for (Integer j = 1; j <= 2 * (n - i); j++) {
System.debug(' ');
}
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
System.debug('');
}
Output:
* *
** **
*** ***
**** ****
**********
**********
**** ****
*** ***
** **
* *
Example 14: Cross Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = 1; j <= n; j++) {
if (j == i || j == n - i + 1) {
System.debug('*');
} else {
System.debug(' ');
}
}
System.debug('');
}
Output:
* *
* *
*
* *
* *
Example 15: Hourglass Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = 1; j <= i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * (n - i) + 1; j++) {
System.debug('*');
}
System.debug('');
}
for (Integer i = n - 1; i >= 1; i--) {
for (Integer j = 1; j <= i; j++) {
System.debug(' ');
}
for (Integer j = 1; j <= 2 * (n - i) + 1; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*********
*******
*****
***
*
***
*****
*******
*********
Example 16: Zigzag Star Pattern
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
System.debug('');
}
for (Integer i = n - 1; i >= 1; i--) {
for (Integer j = 1; j <= i; j++) {
System.debug('*');
}
System.debug('');
}
Output:
*
**
***
****
*****
****
***
**
*
Example 17: Zigzag Star Pattern (Alternate Rows)
Integer n = 5; // Number of rows
for (Integer i = 1; i <= n; i++) {
if (i % 2 == 0) {
System.debug(' * * * * *');
} else {
for (Integer j = 1; j <= n; j++) {
System.debug('*');
}
}
System.debug('');
}
Output:
*****
* * * * *
*****
* * * * *
*****
Conclusion
Creating star patterns in Apex is not only a creative exercise but also a testament to the versatility of the Salesforce platform. By leveraging the power of loops and conditional statements, you can bring visual delight to your applications and enhance user experiences. So, why not add a touch of magic to your Salesforce development with star patterns? Start exploring, creating, and innovating with Apex today!
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