diff --git a/java/adding-space-to-a-string.java b/java/adding-space-to-a-string.java
new file mode 100644
index 0000000..ff545ec
--- /dev/null
+++ b/java/adding-space-to-a-string.java
@@ -0,0 +1,18 @@
+class Solution {
+  public String addSpaces(String s, int[] spaces) {
+    var result = new StringBuilder();
+    result.ensureCapacity(s.length() + spaces.length);
+
+    int i = 0;
+    for (int j = 0; j < s.length(); ++j) {
+      if (i < spaces.length && spaces[i] == j) {
+        result.append(' ');
+        ++i;
+      }
+
+      result.append(s.charAt(j));
+    }
+
+    return result.toString();
+  }
+}