diff --git a/Basic_Of_Algorithm/src/interestingAlgorithm/arrTest.java b/Basic_Of_Algorithm/src/interestingAlgorithm/arrTest.java
new file mode 100644
index 0000000..1dcc3b4
--- /dev/null
+++ b/Basic_Of_Algorithm/src/interestingAlgorithm/arrTest.java
@@ -0,0 +1,25 @@
+package interestingAlgorithm;
+
+import java.util.Arrays;
+
+public class arrTest {
+
+	public static void main(String[] args) {
+		
+		
+		int[]arr = {1,2,3,4,5};
+		
+		int[]scores;
+		
+		scores = arr;
+		
+		scores[0] = 1320;
+		
+		System.out.println(Arrays.toString(arr));
+		System.out.println(Arrays.toString(scores));
+		
+		
+		//주소값을 복사하는 shallow copy는 copy한 영역을 조정해도 원래값도 바뀜 ㅠ
+	}
+	
+}