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add 面试题02-I for Java

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	`1`	`+/**`
	`2`	`+ * Definition for singly-linked list.`
	`3`	`+ * public class ListNode {`
	`4`	`+ * int val;`
	`5`	`+ * ListNode next;`
	`6`	`+ * ListNode(int x) { val = x; }`
	`7`	`+ * }`
	`8`	`+ */`
	`9`	`+class Solution {`
	`10`	`+ public ListNode removeDuplicateNodes(ListNode head) {`
	`11`	`+ if (head == null) {`
	`12`	`+ return null;`
	`13`	`+ }`
	`14`	`+ Set<Integer> cache = new HashSet<>();`
	`15`	`+ // 初始化参数`
	`16`	`+ ListNode pre = head, cur = pre.next;`
	`17`	`+ cache.add(head.val);`
	`18`	`+`
	`19`	`+ while (cur != null) {`
	`20`	`+ if (cache.contains(cur.val)) {`
	`21`	`+ pre.next = cur.next;`
	`22`	`+ cur = pre.next;`
	`23`	`+ } else {`
	`24`	`+ cache.add(cur.val);`
	`25`	`+ pre = cur;`
	`26`	`+ cur = cur.next;`
	`27`	`+ }`
	`28`	`+ }`
	`29`	`+`
	`30`	`+ return head;`
	`31`	`+ }`
	`32`	`+}`

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