java swap two characters in string

/**
 * @author lautturi.com 
 * Java example: java string how to swap  two characters  
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {
		String originalString = "hella jova";
		
		//Strings are immutable
		char[] c = originalString.toCharArray(); 
		
		char temp = c[7];
		c[7] = c[4];
		c[4] = temp;
		
		//Result
		String newStr = new String(c);
		System.out.println(newStr);
	}
}

output:

hello java