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solves find the duplicate element #287 in java

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`@@ -234,7 +234,7 @@`
`234`	`234`	`\| 284 \| [Peeking Iterator](https://leetcode.com/problems/peeking-iterator) \| [![Java](assets/java.png)](src/PeekingIterator.java) \| \|`
`235`	`235`	`\| 285 \| 🔒 [Inorder Successor in BST](https://leetcode.com/problems/inorder-successor-in-bst) \| \| \|`
`236`	`236`	`\| 286 \| 🔒 [Walls and Gates](https://leetcode.com/problems/walls-and-gates) \| \| \|`
`237`		`-\| 287 \| [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number) \| \| \|`
	`237`	`+\| 287 \| [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number) \| [![Java](assets/java.png)](src/FindTheDuplicateNumber.java) \| \|`
`238`	`238`	`\| 288 \| 🔒 [Unique Word Abbreviation](https://leetcode.com/problems/unique-word-abbreviation) \| \| \|`
`239`	`239`	`\| 289 \| [Game of Life](https://leetcode.com/problems/game-of-life) \| \| \|`
`240`	`240`	`\| 290 \| [Word Pattern](https://leetcode.com/problems/word-pattern) \| [![Java](assets/java.png)](src/WordPattern.java) [![Python](assets/python.png)](python/word_pattern.py) \| \|`

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`@@ -0,0 +1,26 @@`
	`1`	`+// https://leetcode.com/problems/find-the-duplicate-number`
	`2`	`+// T: O(N)`
	`3`	`+// S: O(1)`
	`4`	`+`
	`5`	`+public class FindTheDuplicateNumber {`
	`6`	`+ public static int findDuplicate(int[] nums) {`
	`7`	`+ int tortoise = nums[0];`
	`8`	`+ int hare = nums[0];`
	`9`	`+`
	`10`	`+ do {`
	`11`	`+ tortoise = nums[tortoise];`
	`12`	`+ hare = nums[nums[hare]];`
	`13`	`+ } while (tortoise != hare);`
	`14`	`+`
	`15`	`+ // Find the "entrance" to the cycle.`
	`16`	`+ tortoise = nums[0];`
	`17`	`+`
	`18`	`+ while (tortoise != hare) {`
	`19`	`+ tortoise = nums[tortoise];`
	`20`	`+ hare = nums[hare];`
	`21`	`+ }`
	`22`	`+`
	`23`	`+ return hare;`
	`24`	`+ }`
	`25`	`+}`
	`26`	`+`

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