Reverse words in a string in Java

Learn to reverse each word in a sentence in Java with example. We will reverse the words in string using StringBuilder and StringUtils classes.

Original String – how to do in java

Reverse words – woh ot od ni avaj

1. Java program to reverse each word in a sentence

1.1. Using StringBuilder class

• Tokenize each word using String.split() method.
• Loop through string array and use StringBuilder.reverse() method to reverse each word.
• Join all revered words to get back string.

String blogName = "how to do in java";
StringBuilder reverseString = new StringBuilder();

String[] words = blogName.split(" ");		//step 1

for (String word : words) 
{
    String reverseWord = new StringBuilder(word).reverse().toString();		//step 2
    reverseString.append(reverseWord + " ");								//step 3
}

System.out.println( reverseString.toString().trim() );		//verify reversed string

Program output.

woh ot od ni avaj

1.2. Using StringUtils class

StringUtils class is in Apache command lang library. Use it’s StringUtils.reverseDelimited() method to reverse each word and join the string.

String blogName = "how to do in java";

String reverseString = StringUtils.reverseDelimited( StringUtils.reverse(sentence), ' ' );

System.out.println( reverseString );

Program output.

woh ot od ni avaj

In this post, we learned to reverse each word in a sentence in Java.

Happy Learning !!