Change the middle word with last word.

MiddleWordSwap.java

package learn;

public class MiddleWordSwap {

  public static void main(String[] args) {
		char[] str = "Java is nice but Scala is even better :)".toCharArray();
		char[] goal = "Java is nice but :) is even better Scala".toCharArray();

		System.out.println("Original: '" + new String(str) + "'");
		str = rearrange(str);

		boolean success = new String(str).equals(new String(goal));
		System.out.println("Re-arranged: '" + new String(str)
				+ "'\n\nOperation " + (success ? "succeeded." : "failed!"));

	}

	private static char[] rearrange(char[] str) {
		String[] strArray		= (new String(str)).split(" ");
		int sizeArray			= strArray.length;
		String temp				= strArray[sizeArray / 2];
		strArray[sizeArray / 2]	= strArray[sizeArray - 1];
		strArray[sizeArray - 1]	= temp;
		StringBuilder tempResult= new StringBuilder("");
		for (String tmp : strArray) {
			tempResult.append(tmp + " ");
		}
		str = tempResult.toString().trim().toCharArray();
		return str;
	}

}