solves #2678: Number of Senior Citizens in java

Author: anishLearnsToCode

README.md

@@ -821,4 +821,4 @@
 | 2656 | [Maximum Sum With Exactly K Elements](https://leetcode.com/problems/maximum-sum-with-exactly-k-elements)                                                               |                                                                               [![Java](assets/java.png)](src/MaximumSumWithExactlyKElements.java)                                                                                |                                                                                                                                   |
 | 2660 | [Determine the Winner of a Bowling Game](https://leetcode.com/problems/determine-the-winner-of-a-bowling-game)                                                         |                                                                              [![Java](assets/java.png)](src/DetermineTheWinnerOfABowlingGame.java)                                                                               |                                                                                                                                   |
 | 2670 | [Find the Distinct Difference Array](https://leetcode.com/problems/find-the-distinct-difference-array)                                                                 |                                                                               [![Java](assets/java.png)](src/FindTheDistinctDifferenceArray.java)                                                                                |                                                                                                                                   |
-| 2678 | [Number of Senior Citizens](https://leetcode.com/problems/number-of-senior-citizens)                                                                                   |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2678 | [Number of Senior Citizens](https://leetcode.com/problems/number-of-senior-citizens)                                                                                   |                                                                                   [![Java](assets/java.png)](src/NumberOfSeniorCitizens.java)                                                                                    |                                                                                                                                   |

src/NumberOfSeniorCitizens.java

@@ -0,0 +1,18 @@
+// https://leetcode.com/problems/number-of-senior-citizens
+// T: O(N)
+// S: O(1)
+
+public class NumberOfSeniorCitizens {
+    public int countSeniors(String[] details) {
+        int seniors = 0;
+        for (String detail : details) {
+            int age = getAge(detail);
+            if (age > 60) seniors++;
+        }
+        return seniors;
+    }
+
+    private int getAge(String detail) {
+        return Integer.parseInt(detail.substring(11, 13));
+    }
+}