Update sample.java, implement Hashset code

Sample.java

@@ -1,7 +1,48 @@
-// Time Complexity :
-// Space Complexity :
-// Did this code successfully run on Leetcode :
-// Any problem you faced while coding this :
+// Time Complexity : O(1)
+// Space Complexity : O(N)
+// Did this code successfully run on LeetCode: yes
+// Any problem you faced while coding this : no
 
 
 // Your code here along with comments explaining your approach
+
+
+class MyHashSet {
+
+    private static final int SIZE = 420;
+    private LinkedList<Integer>[] buckets;
+
+    public MyHashSet() {
+        buckets = new LinkedList[SIZE];
+        for( int i = 0; i<SIZE; i++){
+            buckets[i] = new LinkedList<Integer>();
+        }
+    }
+
+    private int hash(int key) {
+        return key % SIZE;
+    }
+
+    public void add(int key) {
+        LinkedList<Integer> bucket = buckets[hash(key)];
+        if(!bucket.contains(key)) bucket.add(key);
+    }
+
+    public void remove(int key) {
+        buckets[hash(key)].remove((Integer)key);
+
+
+    }
+
+    public boolean contains(int key) {
+                return buckets[hash(key)].contains(key);
+    }
+}
+
+/**
+ * Your MyHashSet object will be instantiated and called as such:
+ * MyHashSet obj = new MyHashSet();
+ * obj.add(key);
+ * obj.remove(key);
+ * boolean param_3 = obj.contains(key);
+ */