diff --git a/core-java-modules/core-java-numbers-conversions/pom.xml b/core-java-modules/core-java-numbers-conversions/pom.xml
index 55df86d5c7..f745b83f8a 100644
--- a/core-java-modules/core-java-numbers-conversions/pom.xml
+++ b/core-java-modules/core-java-numbers-conversions/pom.xml
@@ -12,6 +12,14 @@
         <version>0.0.1-SNAPSHOT</version>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <finalName>core-java-numbers-conversions</finalName>
         <resources>
diff --git a/core-java-modules/core-java-numbers-conversions/src/main/java/com/baeldung/stringtoint/StringToIntConverter.java b/core-java-modules/core-java-numbers-conversions/src/main/java/com/baeldung/stringtoint/StringToIntConverter.java
new file mode 100644
index 0000000000..151dcb3fdb
--- /dev/null
+++ b/core-java-modules/core-java-numbers-conversions/src/main/java/com/baeldung/stringtoint/StringToIntConverter.java
@@ -0,0 +1,38 @@
+package com.baeldung.stringtoint;
+
+import java.util.Optional;
+import org.apache.commons.lang3.math.NumberUtils;
+
+public class StringToIntConverter {
+    Optional<Integer> convertStringToIntUsingIntegerParseInt(String input){
+        try {
+            return Optional.of(Integer.parseInt(input));
+        } catch (NumberFormatException e) {
+            // log or handle the error
+            return Optional.empty();
+        }
+    }
+
+    Optional<Integer> convertStringToIntUsingIntegerValueOf(String input){
+        try {
+            return Optional.of(Integer.valueOf(input));
+        } catch (NumberFormatException e) {
+            // log or handle the error
+            return Optional.empty();
+        }
+    }
+
+    Optional<Integer> convertStringToIntUsingIntegerDecode(String input){
+        try {
+            return Optional.of(Integer.decode(input));
+        } catch (Exception e) {
+            // log or handle the error
+            return Optional.empty();
+        }
+    }
+
+    int convertStringToIntUsingNumberUtils(String input, Integer defaultValue){
+        return NumberUtils.toInt(input, defaultValue);
+    }
+}
+
diff --git a/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/stringtoint/StringToIntConverterUnitTest.java b/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/stringtoint/StringToIntConverterUnitTest.java
new file mode 100644
index 0000000000..15cc04ed04
--- /dev/null
+++ b/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/stringtoint/StringToIntConverterUnitTest.java
@@ -0,0 +1,53 @@
+package com.baeldung.stringtoint;
+
+import java.util.Arrays;
+import java.util.List;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class StringToIntConverterUnitTest {
+    
+    private StringToIntConverter stringToIntConverter = new StringToIntConverter();
+
+    @Test
+    void whenConvertingIntToString_thenInvalidCasesReturnIntegerMinValue() {
+        List<TestData> testData = Arrays.asList(
+                new TestData("", Integer.MIN_VALUE),
+                new TestData(null, Integer.MIN_VALUE),
+                new TestData("23,56", Integer.MIN_VALUE),
+                new TestData("2147483648", Integer.MIN_VALUE),
+                new TestData("-2147483649", Integer.MIN_VALUE),
+                new TestData("hello", Integer.MIN_VALUE)
+        );
+        testData.forEach(data -> {
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingIntegerParseInt(data.input).orElse(Integer.MIN_VALUE));
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingIntegerValueOf(data.input).orElse(Integer.MIN_VALUE));
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingIntegerDecode(data.input).orElse(Integer.MIN_VALUE));
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingNumberUtils(data.input,Integer.MIN_VALUE ));
+        });
+    }
+
+    @Test
+    void whenConvertingIntToString_thenValidCasesReturnUnboxedInt() {
+        List<TestData> testData = Arrays.asList(
+                new TestData("23", 23),
+                new TestData("-23", -23)
+        );
+        testData.forEach(data -> {
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingIntegerParseInt(data.input).orElse(Integer.MIN_VALUE));
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingIntegerValueOf(data.input).orElse(Integer.MIN_VALUE));
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingNumberUtils(data.input, Integer.MIN_VALUE));
+            Assertions.assertEquals(data.expectedOutput, stringToIntConverter.convertStringToIntUsingIntegerDecode(data.input).orElse(Integer.MIN_VALUE));
+        });
+    }
+
+    public static class TestData{
+        String input;
+        Integer expectedOutput;
+
+        TestData(String input, Integer expectedOutput){
+            this.input = input;
+            this.expectedOutput = expectedOutput;
+        }
+    }
+}
diff --git a/core-java-modules/core-java-string-conversions/src/main/java/com/baeldung/stringtoint/StringToIntConverter.java b/core-java-modules/core-java-string-conversions/src/main/java/com/baeldung/stringtoint/StringToIntConverter.java
deleted file mode 100644
index 03d77c2aea..0000000000
--- a/core-java-modules/core-java-string-conversions/src/main/java/com/baeldung/stringtoint/StringToIntConverter.java
+++ /dev/null
@@ -1,52 +0,0 @@
-package com.baeldung.stringtoint;
-
-import java.util.Optional;
-import org.apache.commons.lang3.math.NumberUtils;
-
-public class StringToIntConverter {
-    
-    private StringToIntConverter() {
-    }
-
-    public static Integer convertStringToIntUsingIntegerParseInt(String input){
-        try {
-            return Integer.parseInt(input);
-        } catch (NumberFormatException e) {
-            // log or handle the error
-            return Integer.MIN_VALUE;
-        }
-    }
-
-    public static Integer convertStringToIntUsingIntegerValueOf(String input){
-        try {
-            return Integer.valueOf(input);
-        } catch (NumberFormatException e) {
-            // log or handle the error
-            return Integer.MIN_VALUE;
-        }
-    }
-
-    public static Integer convertStringToIntUsingIntegerDecode(String input){
-        try {
-            return Integer.decode(input);
-        } catch (Exception e) {
-            // log or handle the error
-            return Integer.MIN_VALUE;
-        }
-    }
-
-    public static Integer convertStringToIntUsingOptional(String input){
-        Optional<Integer> parsedInt;
-        try {
-            parsedInt = Optional.of(Integer.parseInt(input));
-        } catch (Exception e) {
-            // log or handle the error
-            parsedInt = Optional.empty();
-        }
-        return parsedInt.orElse(Integer.MIN_VALUE);
-    }
-
-    public static int convertStringToIntUsingNumberUtils(String input){
-        return NumberUtils.toInt(input, Integer.MIN_VALUE);
-    }
-}
diff --git a/core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntConverterUnitTest.java b/core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntConverterUnitTest.java
deleted file mode 100644
index 2bfb4db161..0000000000
--- a/core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntConverterUnitTest.java
+++ /dev/null
@@ -1,53 +0,0 @@
-package com.baeldung.stringtoint;
-
-import java.util.Arrays;
-import java.util.List;
-import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.Test;
-
-class StringToIntConverterUnitTest {
-
-    @Test
-    void whenConvertingIntToString_thenInvalidCasesReturnIntegerMinValue() {
-        List<TestData> testData = Arrays.asList(
-                new TestData("", Integer.MIN_VALUE),
-                new TestData(null, Integer.MIN_VALUE),
-                new TestData("23,56", Integer.MIN_VALUE),
-                new TestData("2147483648", Integer.MIN_VALUE),
-                new TestData("-2147483649", Integer.MIN_VALUE),
-                new TestData("hello", Integer.MIN_VALUE)
-        );
-        testData.forEach(data -> {
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingIntegerParseInt(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingIntegerValueOf(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingOptional(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingIntegerDecode(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingNumberUtils(data.input));
-        });
-    }
-
-    @Test
-    void whenConvertingIntToString_thenValidCasesReturnUnboxedInt() {
-        List<TestData> testData = Arrays.asList(
-                new TestData("23", 23),
-                new TestData("-23", -23)
-        );
-        testData.forEach(data -> {
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingIntegerParseInt(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingIntegerValueOf(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingOptional(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingNumberUtils(data.input));
-                Assertions.assertEquals(data.expectedOutput, StringToIntConverter.convertStringToIntUsingIntegerDecode(data.input));
-        });
-    }
-
-    public static class TestData{
-        String input;
-        Integer expectedOutput;
-
-        TestData(String input, Integer expectedOutput){
-            this.input = input;
-            this.expectedOutput = expectedOutput;
-        }
-    }
-}
\ No newline at end of file