Java™ Application Development on Linux - Dator

92Chapter 3An Experienced Programmer’s Introduction to JavaExample 3.28 The Person classclassPerson{String name;Address addr;}publicPerson(String name, Address addr){this.name = name;this.addr = addr;} // constructor// ... lots more code is herepublic String getName(){return name;}Example 3.29 An example use of polymorphism//...Sample labwork = new Sample(petridish);Employee tech = new Employee(newguy, 27);Identifiable stuff;//...if (mode) {stuff = labwork;} else {stuff = tech;}id = stuff.getID();The key point here is when the call is made to getID(). The compilercan’t know at compile time which object will be referred to by stuff, so itdoesn’t know whose getID() method will be called. But don’t worry—it works