Java Replace String

package com.java.myapp;

public class MyClass {

    public static void main(String[] args) {
         
    	String a = new String("Welcome to ThaiCreate.Com Version 2013");
    	String b = new String("THAICREATE.COM");

        System.out.println(a.replace("2013","2014"));
        System.out.println(b.replace(".","-"));
    	
    }
	
}