java replace last occurrence of a specific character in string

/**
 * @author lautturi.com 
 * Java example: Java replace the last specific character in a string
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {

		// From: 10.000.000.00
		// To: 10.000.000,00
		String cash = "10.000.000.00";
		StringBuilder temp1 = new StringBuilder(cash);
		StringBuilder temp2 = new StringBuilder(temp1.reverse().toString().replaceFirst("[.]", ","));
		System.out.println(temp2.reverse());
	}
}