From 547f99925fba49b2cb8515ffe6e8486a35246802 Mon Sep 17 00:00:00 2001 From: Shashank agarwal Date: Thu, 20 Dec 2018 10:19:27 +0530 Subject: [PATCH] Added the code of Replace char in a string at specific index (#5869) * Added the code of Replace char in a string at specific index * added test cases * Renamed the Test class name end with UnitTest * Renamed the Test class name end with UnitTest * Renamed the Test class name end with UnitTest * Replaced README with the upstream repo --- java-strings/README.md | 2 +- .../string/ReplaceCharacterInString.java | 21 +++++++++++++++++ .../string/ReplaceCharInStringUnitTest.java | 23 +++++++++++++++++++ 3 files changed, 45 insertions(+), 1 deletion(-) create mode 100644 java-strings/src/main/java/com/baeldung/string/ReplaceCharacterInString.java create mode 100644 java-strings/src/test/java/com/baeldung/string/ReplaceCharInStringUnitTest.java 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)); + } +}