How to Reverse a String Word by Word in Java?

There are multiple way to Reverse a String Word by Word in Java.

using StringBuilder() method:-

Here we are using reverse(), split() and substring() methods to reverse each word.
From split(“\\s”) method, we can get all words in an array.
Now traverse each word from for loop.
Create String builder object and pass each word.
Now we can reverse each word from reverse() method of StringBuilder class.
Convert each word in string from toString() method.
Print each reverse word.

Using for loop method :-

From split(” “) method, we can get all words in an array.
Now traverse each word from for loop.
Convert each word in character array and store in char c[].
Starting from last word of words array, append each word to c[j] variable.
Print each word from System.out.print(c[j]);

				
					public class ReverseEachWord {
	public static void main(String[] args) {
		String str = "java spring hibernate";

		System.out.println("using string builder with reverse method :- " + reverseWordByWord(str));

		System.out.println("using for loop with reverse method:- ");
		String s[] = str.split(" ");
		for (int i = 0; i < s.length; i++) {
			char c[] = s[i].toCharArray();
			for (int j = c.length - 1; j >= 0; j--) {
				System.out.print(c[j]);
			}
			System.out.print(" ");
		}
	}

	public static String reverseWordByWord(String st) {
		String word[] = st.split("\\s");
		String reverseWord = "";
		for (String str : word) {
			StringBuilder sb = new StringBuilder(str);
			sb.reverse();
			reverseWord += sb.toString() + " ";
		}
		return reverseWord.trim();
	}
}

Output :-
using string builder with reverse method :- avaj gnirps etanrebih
using for loop with reverse method:-
avaj gnirps etanrebih