Exam 9: Inheritance

Consider the following code snippet: public class Employee { ) . . Public void setDepartment(String deptName) { ) . . } } Public class Programmer extends Employee { ) . . Public void setProjectName(String projName) { ) . . } Public void setDepartment(String deptName) { ) . . } } Which of the following statements is NOT correct?

Consider the following code snippet: public class Motorcycle extends Vehicle { ) . . Public Motorcycle(int numberAxles) { Super.numberAxles; } } What does this code do?

You are creating a Motorcycle class that is supposed to be a subclass of the Vehicle class. Which of the following class declaration statements will accomplish this?

To override a superclass method in a subclass, the subclass method ____.

Consider the following code snippet: public class Vehicle { Protected int numberAxles; ) . . } Data in the numberAxles variable can be accessed by ____.

Which of the following is true regarding subclasses?

Which of the following statements about abstract methods is true?

Consider the following code snippet: public class Motorcycle extends Vehicle { ) . . Public Motorcycle(int numberAxles) { Super(numberAxles); //line #1 } } If the line marked "//line #1" was missing, which of these statements would be correct?

Consider the following code snippet: public class Coin { Private String name; ) . . Public boolean equals(Object otherCoin) { Return name.equals(otherCoin.name); } ) . . } What is wrong with this code?

You are creating a Motorcycle class which is supposed to be a subclass of the Vehicle class. Which of the following class declaration statements will accomplish this?

Which of the following statements about comparing objects is correct?

Consider the following code snippet of a function object public interface Measurer { Double measure(______ anObject); } Complete this code to allow the interface to handle all classes?

When declared as protected, data in an object can be accessed by ____.

All hamsters are rodents and all rodents are mammals. What hierarchy best captures this information?

Consider the classes shown below: public class Parent { Public void doSomething(){/* Implementation not shown */} } Public class Child extends Parent { Public void doAnotherThing(){/* Implementation not shown */} } Which lines in the following code will compile without error? Parent kid = new Child(); Kid)doSomething(); // line 1 Kid)doAnotherThing(); // line 2

Consider the following code snippet: public abstract class Employee { Public abstract void setSalary(); ) . . } You wish to create a concrete subclass named Programmer. Which of the following is the correct way to declare this subclass?

A class that represents a more specific entity in an inheritance hierarchy is called a/an ____.

Consider the classes shown below: public class Parent { Public void doSomething() // method 1 { /* Implementation not shown */ } } Public class Child extends Parent { Public void doSomething(int n) // method 2 { /* Implementation not shown */ } Public void doSomething() // method 3 { /* Implementation not shown */ } } If the variable kid is defined below, which version of the doSomething method can be called on the variable kid? Parent kid = new Child();

Consider the classes shown below: public class Parent { Public void doSomething(){/* Implementation not shown */} } Public class Child extends Parent { Public void doAnotherThing(){/* Implementation not shown */} } Which lines in the following code will compile without error? Child kid = new Child(); Kid)doSomething(); // line 1 Kid)doAnotherThing(); // line 2

Consider the following code snippet: public class Vehicle { ) . . Public void setVehicleClass(double numberAxles) { ) . . } } Public class Motorcycle extends Vehicle { ) . . Public void setVehicleClass(double numberAxles) { ) . . } } Which of the following statements is correct? (I changed the wording below, because methods override methods. . .classes don't override methods)