contains duplicate

Author: hjeomdev

contains-duplicate/hjeomdev.java

@@ -0,0 +1,17 @@
+import java.util.HashSet;
+import java.util.Set;
+
+class Solution {
+    public boolean containsDuplicate(int[] nums) {
+        Set set = new HashSet();
+        for (int num : nums) {
+            set.add(num);
+        }
+
+        if (set.size() != nums.length) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}