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solves #2678: Number of Senior Citizens in java

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`821`	`821`	`\| 2656 \| [Maximum Sum With Exactly K Elements](https://leetcode.com/problems/maximum-sum-with-exactly-k-elements) \| [![Java](assets/java.png)](src/MaximumSumWithExactlyKElements.java) \| \|`
`822`	`822`	`\| 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) \| \|`
`823`	`823`	`\| 2670 \| [Find the Distinct Difference Array](https://leetcode.com/problems/find-the-distinct-difference-array) \| [![Java](assets/java.png)](src/FindTheDistinctDifferenceArray.java) \| \|`
`824`		`-\| 2678 \| [Number of Senior Citizens](https://leetcode.com/problems/number-of-senior-citizens) \| \| \|`
	`824`	`+\| 2678 \| [Number of Senior Citizens](https://leetcode.com/problems/number-of-senior-citizens) \| [![Java](assets/java.png)](src/NumberOfSeniorCitizens.java) \| \|`

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	`1`	`+// https://leetcode.com/problems/number-of-senior-citizens`
	`2`	`+// T: O(N)`
	`3`	`+// S: O(1)`
	`4`	`+`
	`5`	`+public class NumberOfSeniorCitizens {`
	`6`	`+ public int countSeniors(String[] details) {`
	`7`	`+ int seniors = 0;`
	`8`	`+ for (String detail : details) {`
	`9`	`+ int age = getAge(detail);`
	`10`	`+ if (age > 60) seniors++;`
	`11`	`+ }`
	`12`	`+ return seniors;`
	`13`	`+ }`
	`14`	`+`
	`15`	`+ private int getAge(String detail) {`
	`16`	`+ return Integer.parseInt(detail.substring(11, 13));`
	`17`	`+ }`
	`18`	`+}`

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