How to reverse each word in a sentence using StringBuffer class

import java.util.StringTokenizer;

//Define the functional interface with SAM 'ReverseEachWord'
interface ReverseEachWord {
	public StringBuffer reverseword(String str);
}

public class ReverseEachString {

	public static void main(String[] args) {

		/*
		 * Define the Lambda expression for the functional interface 'ReverseEachWord'
		 */
		ReverseEachWord Rew = ((Sentence) -> {
	    // Process each word in a Sentence, and store in 'resultStr' StringBuffer variable
			StringTokenizer allWords = new StringTokenizer(Sentence);
			StringBuffer resultStr = new StringBuffer();
			while (allWords.hasMoreTokens()) {
				StringBuffer nextWord = new StringBuffer(allWords.nextToken());
				resultStr.append(nextWord.reverse() + " ");
			}
			return resultStr;
		});
		System.out.println("Reversing each word of 'How are you' :" + Rew.reverseword("How are you"));
		System.out.println("Reversing each word of 'This program uses Lambda expression' :"
				+ Rew.reverseword("This program uses Lambda expression"));
		System.out.println("Reversing each word of 'StringBuffer supports reverse method' :"
				+ Rew.reverseword("StringBuffer supports reverse method"));
		System.out.println("Reversing each word of 'Executed without any errors' :"
				+ Rew.reverseword("Executed without any errors"));
	}
}