Learn to reverse each word in a sentence in Java with example. We will reverse words in string in place using StringBuilder and StringUtils classes.
Original String – how to do in java
Reverse words – woh ot od ni avaj
1. Reverse words in string – 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
2. Reverse words in string – 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 !!
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ismail
How can I reverse 2 words in a string? For example reverse “Hi John” to “John Hi”.
Anton
// this is a little hard coded, you can’t use StringBuilder for this task
String original = “Hi John”;
String [] split = original.split(” “);
String result = split[1] + ” ” + split[0];
System.out.println(result);
Jagannathan
@Rishab
was this question is asked in amazon interview?
Rishabh Gupta
How can i reverse word of string without using any inbuilt function?
Mohan Das
store it in character array .Overwrite accordance with reversal using INDEX OF CHARACTERS
Here below is your program:-
import java.util.Scanner; public class Reverse { public static void main(String args[]) { Scanner sc=new Scanner(System.in); System.out.println("Enter the string:"); String s = sc.nextLine(); int l = s.length(); System.out.println("Length="+l); char ch[] = s.toCharArray(); for(int i=l-1; i>=0; i--) { System.out.print(ch[i]); } } }