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The reverseDelimited() method of the StringUtils class in the Commons LangS library offers a simple way to reverse the words in a String. This method takes two arguments. The first argument specifies the String to reverse. The second argument specifies the word delimiter, which is normally a space character. The ReverseWordsTest class demonstrates this:

ReverseWordsTest.java

package test;

import java.io.IOException;

import org.apache.commons.lang.StringUtils;

public class ReverseWordsTest {

	public static void main(String[] args) throws IOException {

		String str = "Let's reverse these words";
		System.out.println("Original:" + str);

		String reversed = StringUtils.reverseDelimited(str, ' ');
		System.out.println("Reversed words:" + reversed);

	}

}

Here is the console output:

Results

Original:Let's reverse these words
Reversed words:words these reverse Let's