Java: More String Methods

class Java{
    public static void main(String args[]){
        String business = "Zach Dyer Design";
        //Returns the index of the first "D"
        System.out.println(business.indexOf("D"));
        //Starts to search the string from index 7 and returns 10
        System.out.println(business.indexOf("D",7));

        String first = "Zach ";
        String last = "Dyer";

        //Concatenate strings
        System.out.println(first + last);

        //Concatenate strings
        System.out.println(first.concat(last));

        //Replace Zach with Kris and concatenate first and last name
        System.out.println(first.replace("Zach", "Kris") + last);

        String boom = "boom";
        //Print string to uppercase
        System.out.println(boom.toUpperCase());

        String loud = "I AM SPEAKING LOUD";
        //Prints string to lowercase
        System.out.println(loud.toLowerCase());

        String trimString = "    I need some trimming up     ";
        //Cleans up the blank spaces before and after the string.
        System.out.println("<" + trimString.trim() + ">");

        //Here some weird stuff
        System.out.println(trimString.getBytes());
        //Some more
        System.out.println(trimString.hashCode());
    }
}