This is how pirates use Strings and void methods.

Piratey.java

import java.util.Scanner;
import java.util.Random;

class Piratey {
	public static void main(String args[]) {
		String name;

		Scanner input = new Scanner(System.in);

		System.out.print("Enter in your first name: ");
		name = input.next();

		// Greet the pirate!
		//
		// The following is the same as:
		//   String pirateName = piratize(name);
		//   greet(pirateName);
		//
		// Notice how we can use the result of a function as
		// input to another!
		greet(piratize(name));

		// We can call functions with constants.
		say("Me be a pirate. Ye be a landlubber.");

		// Call upon another function (with no arguments) to
		// use the shout function to exclaim a random pirate phrase
		exclamation();
	}

	// This is a function that takes a String as input
	// It has no output, but it prints to the screen.
	static void greet(String name) {
		System.out.println("Ahoy, " + name + "!");
	}

	// This is a function that also takes a String as input.
	// It, however, returns a new String.
	// 
	// Notice how it uses the parameter (name) and changes it
	// This will _not_ change the value of the variable that is
	// passed to it, because the value being assigned is a
	// brand new value.
	//
	// It uses the return statement to end the function and
	// present the output to the place that called the function
	// originally.
	static String piratize(String name) {
		name = "Dread Pirate " + name;

		// End the function and use the new value of name
		// as the output.
		return name;
	}

	// This function has a String as input, but no output.
	// It simply prints to the screen.
	static void say(String message) {
		System.out.println(message + " Yarr!");
	}

	// Likewise for this function, but it prints something
	// different.
	static void shout(String message) {
		System.out.println("Arrr! " + message);
	}

	// This function takes no input nor any output.
	// It relies on other functions to do real work.
	static void exclamation() {
		// Randomly pick a phrase to shout
		Random rnd = new Random();
		
		int num = rnd.nextInt(3);

		// Based upon the random number, we will determine what
		// our pirate program will say.
		String msg = "";
		if (num == 0) {
			msg = "Shiver me timbers!";
		}
		else if (num == 1) {
			msg = "Dead men tell no tales.";
		}
		else if (num == 2) {
			msg = "Weigh anchor and hoist the mizzen!";
		}
		
		// Call the other function to shout this statement
		//
		// Notice how we can call a function using a variable
		// as input.
		shout(msg);
	}
}