StringReplaceStuff

public class StringReplaceStuff {

	public static void main(String[] args) {
		String testString = "Hello World!";

		// replace o with 0, replaceAll takes a string pattern to replace
		String osReplaced = testString.replaceAll("o", "0");
		System.out.println("Without O = " + osReplaced);

		// if we want to add to our replacement, we need to do it in different
		// step strings
		String esReplaced = osReplaced.replaceAll("e", "3");
		System.out.println("Without O and E= " + esReplaced);

		// otherwise if we just want to print different transformations
		System.out.println(testString.replaceAll("o", "0"));
		System.out.println(testString.replaceAll("e", "3"));

		/*
		 * Note: replaceAll returns a MODIFIED string, Strings are immutable so
		 * you need to keep assigning the result of replaceAll in order to
		 * achieve your transformation
		 */
	}

}