diff --git a/String/stringCompression.java b/String/stringCompression.java
new file mode 100644
index 0000000..4d1eb9f
--- /dev/null
+++ b/String/stringCompression.java
@@ -0,0 +1,22 @@
+//Input: aaaabbbccc
+//Output: abc
+
+public static String stringCompression(String str){
+     int n = str.length();
+     int i = 1;
+     char curr = str.charAt(0);
+     StringBuilder sb = new StringBuilder();
+     sb.append(curr);
+     while(i < n) {
+       if(curr == str.charAt(i)) {
+          i++;
+       } else {
+          curr = str.charAt(i);
+          sb.append(curr);
+       }
+    }
+		return sb.toString();
+	}
+
+//Time Complexity : O(n)
+//Space Complexity: O(1)