diff --git a/java-strings/README.md b/java-strings/README.md
index 2713f69d58..7ff1b0ceea 100644
--- a/java-strings/README.md
+++ b/java-strings/README.md
@@ -2,7 +2,7 @@
 
 ## Java Strings Cookbooks and Examples
 
-### Relevant Articles: 
+### Relevant Articles:
 - [String Operations with Java Streams](http://www.baeldung.com/java-stream-operations-on-strings)
 - [Converting String to Stream of chars](http://www.baeldung.com/java-string-to-stream)
 - [Java 8 StringJoiner](http://www.baeldung.com/java-string-joiner)
diff --git a/java-strings/src/main/java/com/baeldung/string/ReplaceCharacterInString.java b/java-strings/src/main/java/com/baeldung/string/ReplaceCharacterInString.java
new file mode 100644
index 0000000000..e8d1ce2d8b
--- /dev/null
+++ b/java-strings/src/main/java/com/baeldung/string/ReplaceCharacterInString.java
@@ -0,0 +1,21 @@
+package com.baeldung.string;
+
+public class ReplaceCharacterInString {
+    public  String replaceCharSubstring(String str, char ch, int index) {
+        String myString = str.substring(0, index) + ch + str.substring(index+1);
+        return myString;
+    }
+
+    public  String replaceCharStringBuilder(String str, char ch, int index) {
+        StringBuilder myString = new StringBuilder(str);
+        myString.setCharAt(index, ch);
+        return myString.toString();
+    }
+
+    public String replaceCharStringBuffer(String str, char ch, int index) {
+        StringBuffer myString = new StringBuffer(str);
+        myString.setCharAt(index, ch);
+        return myString.toString();
+    }
+
+}
diff --git a/java-strings/src/test/java/com/baeldung/string/ReplaceCharInStringUnitTest.java b/java-strings/src/test/java/com/baeldung/string/ReplaceCharInStringUnitTest.java
new file mode 100644
index 0000000000..07e86bb69b
--- /dev/null
+++ b/java-strings/src/test/java/com/baeldung/string/ReplaceCharInStringUnitTest.java
@@ -0,0 +1,23 @@
+package com.baeldung.string;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class ReplaceCharInStringUnitTest {
+    private ReplaceCharacterInString characterInString = new ReplaceCharacterInString();
+
+    @Test
+    public void whenReplaceCharAtIndexUsingSubstring_thenSuccess(){
+        assertEquals("abcme",characterInString.replaceCharSubstring("abcde",'m',3));
+    }
+
+    @Test
+    public void whenReplaceCharAtIndexUsingStringBuilder_thenSuccess(){
+        assertEquals("abcme",characterInString.replaceCharStringBuilder("abcde",'m',3));
+    }
+
+    @Test
+    public void whenReplaceCharAtIndexUsingStringBuffer_thenSuccess(){
+        assertEquals("abcme",characterInString.replaceCharStringBuffer("abcde",'m',3));
+    }
+}