diff --git a/JAVA/SubstringComparisons.java b/JAVA/SubstringComparisons.java
new file mode 100644
index 0000000..8b8baed
--- /dev/null
+++ b/JAVA/SubstringComparisons.java
@@ -0,0 +1,43 @@
+import java.util.Scanner;
+
+public class SubstringComparisons {
+
+    public static String getSmallestAndLargest(String s, int k) {
+        String smallest = "";
+        String largest = "";
+        
+        String small="",large="";
+        int length=s.length();
+        int times=length-k+1;
+        String[] word=new String[times];
+        for(int i=0;i<times;i++)
+        {
+            word[i]=s.substring(i,i+k);
+        }
+       small=word[0];
+       large=word[times-1];
+        for(int i=0;i<times;i++)
+        {
+            if(word[i].compareTo(small)<0)
+                small=word[i];
+            else if(word[i].compareTo(large)>0)
+                large=word[i];
+            else
+                continue;
+        }
+        smallest=small;
+        largest=large;
+        
+        return smallest + "\n" + largest;
+    }
+
+
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        String s = scan.next();
+        int k = scan.nextInt();
+        scan.close();
+      
+        System.out.println(getSmallestAndLargest(s, k));
+    }
+}