From fb3d9e1999ac85c2c1aa0f447dd846cfe0456f2b Mon Sep 17 00:00:00 2001
From: "JUNHWAN(Chris) JANG" <62946867+itsChrisJang@users.noreply.github.com>
Date: Mon, 31 Mar 2025 10:02:45 +0900
Subject: [PATCH] Create itschrisjang.java

---
 contains-duplicate/itschrisjang.java | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 contains-duplicate/itschrisjang.java

diff --git a/contains-duplicate/itschrisjang.java b/contains-duplicate/itschrisjang.java
new file mode 100644
index 000000000..d08cf003d
--- /dev/null
+++ b/contains-duplicate/itschrisjang.java
@@ -0,0 +1,17 @@
+import java.util.HashSet;
+
+class Solution {
+	public boolean containsDuplicate(int[] nums) {
+		HashSet<Integer> numSet  = new HashSet<>();
+    
+		for (int i = 0; i < nums.length; i++) {
+
+			if (numSet.contains(nums[i])) {
+				return true;
+			}
+			numSet.add(nums[i]);
+		}
+    
+		return false;
+	}
+}