Driver.java

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

public class Driver {
    public static void main(String[]args){
	Greeter g,g2;
	String result;
	g = new Greeter();
	g2 = new Greeter();
	g.setGreeting("Hello");
	g2.setGreeting("How are you doing");
	result = g.greet("Tom");
	System.out.println(result);
	result = g2.greet("Sara");
	System.out.println(result);
    }
}