diff --git a/src/org/hwo/ArrayHelper.java b/src/org/hwo/ArrayHelper.java
index 584fb54..aa68a61 100644
--- a/src/org/hwo/ArrayHelper.java
+++ b/src/org/hwo/ArrayHelper.java
@@ -58,4 +58,14 @@ public class ArrayHelper {
 		
 		return null;
 	}
+	
+	public static <T> int indexOf(T[] array,T element){
+		for (int i=0;i<array.length;i++){
+			if (array[i] == element){
+				return i;
+			}
+		}
+		return -1;
+	}
+	
 }