diff --git a/Java/lab_3/lab_3.java b/Java/lab_3/lab_3.java
new file mode 100644
index 0000000..6c6d1e4
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+++ b/Java/lab_3/lab_3.java
@@ -0,0 +1,59 @@
+package OOP.Java.lab_3;
+
+public class lab_3 {
+    static int maxStrLength;
+    static String result;
+
+    /* public static StringBuilder StringBuilderLowerCase(StringBuilder pText) {
+        StringBuilder pTextLower = new StringBuilder(pText);
+        for (int idx = 0; idx < pText.length(); idx++) {
+            char c = pText.charAt(idx);
+            if (c >= 65 && c <= 65 + 27) {
+                pTextLower.setCharAt(idx, (char) ((int) (pText.charAt(idx)) | 32));
+            }
+        }
+        return pTextLower;
+    } */
+    
+    static void cSubUtil(String string, int leftBoundary, int rightBoundary)
+    {
+        // check if the indices lie in the range of string
+        // and also if it is palindrome
+        while (leftBoundary >= 0 && rightBoundary < string.length() && string.toLowerCase().charAt(leftBoundary) == string.toLowerCase().charAt(rightBoundary)) {
+            // expand the boundary
+            leftBoundary--;
+            rightBoundary++;
+        }
+        // if it's length is greater than maxLength update
+        // maxLength and res
+        if (rightBoundary - leftBoundary - 1 >= maxStrLength) {
+            result = string.substring(leftBoundary + 1, rightBoundary);
+            maxStrLength = rightBoundary - leftBoundary - 1;
+        }
+        return;
+    }
+
+    static int longestPalSubstr(String string)
+    {
+        result = "";
+        maxStrLength = 1;
+        // for every index in the string check palindromes
+        // starting from that index
+        for (int i = 0; i < string.length(); i++) {
+            // check for odd length palindromes
+            cSubUtil(string, i, i);
+            // check for even length palindromes
+            cSubUtil(string, i, i + 1);
+        }
+        System.out.println("Longest palindrome substring is: " + result);
+        return maxStrLength;
+    }
+
+    public static void main(String[] args) {
+        StringBuilder stringToDetect = new StringBuilder("Eva, can I see bees in a cave?");
+        String stripped = stringToDetect.toString().replaceAll("[\\.,:-\\?]? ?", "");
+
+        System.out.println("Initial string: " + stringToDetect.toString());
+        System.out.println("Length is: " + longestPalSubstr(stripped));
+    }
+}