diff --git a/java/76-Minimum-Window-Substring.java b/java/76-Minimum-Window-Substring.java
new file mode 100644
index 000000000..f723e2973
--- /dev/null
+++ b/java/76-Minimum-Window-Substring.java
@@ -0,0 +1,35 @@
+class Solution {
+    //sliding window
+    public String minWindow(String s, String t) {
+        HashMap<Character, Integer> map = new HashMap<>();
+
+        for (char x : t.toCharArray()) {
+            map.put(x, map.getOrDefault(x, 0) + 1);
+        }
+
+        int matched = 0;
+        int start = 0;
+        int minLen = s.length() + 1;
+        int subStr = 0;
+        for (int endWindow = 0; endWindow < s.length(); endWindow++) {
+            char right = s.charAt(endWindow);
+            if (map.containsKey(right)) {
+                map.put(right, map.get(right) - 1);
+                if (map.get(right) == 0) matched++;
+            }
+
+            while (matched == map.size()) {
+                if (minLen > endWindow - start + 1) {
+                    minLen = endWindow - start + 1;
+                    subStr = start;
+                }
+                char deleted = s.charAt(start++);
+                if (map.containsKey(deleted)) {
+                    if (map.get(deleted) == 0) matched--;
+                    map.put(deleted, map.get(deleted) + 1);
+                }
+            }
+        }
+        return minLen > s.length() ? "" : s.substring(subStr, subStr + minLen);
+    }
+}