solves #2278: Percentage of Letter in String in java

Author: anishLearnsToCode

README.md

@@ -736,7 +736,7 @@
 | 2264 | [Largest 3-Same-Digit Number in String](https://leetcode.com/problems/largest-3-same-digit-number-in-string)                                                           |                                                                               [![Java](assets/java.png)](src/Largest3SameDigitNumberInString.java)                                                                               |                                                                                                                                   |
 | 2269 | [Find the K-Beauty of a Number](https://leetcode.com/problems/find-the-k-beauty-of-a-number)                                                                           |                                                                                   [![Java](assets/java.png)](src/FindTheKBeautyOfANumber.java)                                                                                   |                                                                                                                                   |
 | 2273 | [Find Resultant Array After Removing Anagrams](https://leetcode.com/problems/find-resultant-array-after-removing-anagrams)                                             |                                                                           [![Java](assets/java.png)](src/FindResultantArrayAfterRemovingAnagrams.java)                                                                           |                                                                                                                                   |
-| 2278 | [Percentage of Letter in String](https://leetcode.com/problems/percentage-of-letter-in-string)                                                                         |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2278 | [Percentage of Letter in String](https://leetcode.com/problems/percentage-of-letter-in-string)                                                                         |                                                                                 [![Java](assets/java.png)](src/PercentageOfLetterInString.java)                                                                                  |                                                                                                                                   |
 | 2283 | [Check if Number Has Equal Digit Count and Digit Value](https://leetcode.com/problems/check-if-number-has-equal-digit-count-and-digit-value)                           |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2287 | [Rearrange Characters to Make Target String](https://leetcode.com/problems/rearrange-characters-to-make-target-string)                                                 |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2293 | [Min Max Game](https://leetcode.com/problems/min-max-game)                                                                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |

src/PercentageOfLetterInString.java

@@ -0,0 +1,15 @@
+// https://leetcode.com/problems/percentage-of-letter-in-string
+// T: O(|s|)
+// S: O(1)
+
+public class PercentageOfLetterInString {
+    public int percentageLetter(String s, char letter) {
+        int count = 0;
+        for (int index = 0 ; index < s.length() ; index++) {
+            if (letter == s.charAt(index)) {
+                count++;
+            }
+        }
+        return (int) (((double) count / s.length()) * 100);
+    }
+}