Driver.java

import java.io.*;
import java.util.*;

public class Driver {
    public static void main(String[] args) {
	Greeter g,g2,g3;
	String result;
	/*
	g = new Greeter();
	g.setGreeting("Hello");
	result = g.greet("Tom");
	System.out.println(result);
	g2 = new Greeter();
	g2.setGreeting("How are you doing");
	result = g.greet("Tom");
	System.out.println(result);
	result = g2.greet("Sarah");
	System.out.println(result);
	
	g.setGreeting("sup");
	System.out.println(g.greet("Alan"));
	System.out.println(g2.greet("Sue"));
	*/
	g = new Greeter("Hello");
	System.out.println(g.greet("Tom"));
	g2 = new Greeter();
	System.out.println(g2.happyGreet("Robert"));
	System.out.println(g2.sadGreet("Robert"));
	g3 = new Greeter("What's up, ", "Shouldn't you bother someone else, ");
	System.out.println(g3.happyGreet("Bob"));
	System.out.println(g3.sadGreet("Bob"));

    }
}