diff --git a/java/slidingwindow.java b/java/slidingwindow.java
new file mode 100644
index 0000000..21a21dc
--- /dev/null
+++ b/java/slidingwindow.java
@@ -0,0 +1,30 @@
+public class slidingwindow {
+
+    static int maxSum(int[] arr,int k){
+       
+        int n=arr.length;
+
+        if(n<k){
+            System.out.println("Invalid");
+            return -1;
+        }
+        int window_sum=0;
+        for(int i=0;i<k;i++) window_sum+=arr[i];
+
+        int max_sum=window_sum;
+        for(int i=k;i<n;i++){
+            window_sum+=(arr[i]-arr[i-k]);
+            max_sum=Math.max(window_sum,max_sum);
+        }
+
+        return max_sum;
+    }
+
+    public static void main(String[] args) {
+        int k=3;
+        int[] arr={16, 12, 9, 19, 11, 8};
+        System.out.println(maxSum(arr,k));
+    }
+
+
+}