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Core Java. Swaping first and last words in sentence. Bug

I would like to make a piece of code that swap first and last words in sentence. I come up with some solution as you can see below. However, the program doesn't work well. Please help me to find mistake. You code will be much appreciated !
NOW:
input : "London is the capital of UK"
Output : "UK is the capital of UK London "

Should be :
input : "London is the capital of UK"
Output : "UK is the capital of London "

Looking forwards for help from you dear Experts !

package TaskCh;
//import java.util.Scanner;

public class TaskCh {


	public static void main(String[] args) {
	   //  System.out.println("Enter line of text.");
	   // Scanner kb = new Scanner(System.in);
	    String s = "London is the capital of UK" ;  // kb.nextLine(); // Read the whole line instead of word by word
	    System.out.println("Original line is  : ");
	    System.out.println(s);
	    String[] words = s.split("\\s+"); // Split on any whitespace

	    if (words.length > 1) { 
	                     
	    	// Swap first and last words  	
	        s = words[words.length-1] + " " +  s.substring(s.indexOf(words[1], words[0].length() -2 )) + " " + words[0].toLowerCase();

	        s = s.substring(0, 1).toUpperCase() + s.substring(1); // 

	    }

	    System.out.println("\n\n\nModified line is :");
	    System.out.println(s);
	}

}

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SOLUTION

awking00

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ASKER CERTIFIED SOLUTION

Moussa Mokhtari

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CEHJ

Homework done?

awking00

While I would have preferred you attempted to write the code using my directions, since full code is being supplied, this is how I would have gone about it (very simple) -
String str = "London is the capital of UK";
String first = str.substring(0,indexOf(" "));
String last = str.substring(lastIndexOf(" ") + 1);
String middle = str.replace(first,"").replace(last,"");
String output = last + middle + first;

SunnyX

ASKER

Everybody thx for your help ! :)

SunnyX

ASKER

awking00, I'm sorry. I just saw your last post :( I'm actually submitting the close of question, webpage updated that your valuable comment come up :( once again sorry

CEHJ

s = s.replaceAll("^(\\w*)(.*?)(\\w*)$", "$3$2$1");

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