Flashcards - Object Relationship Concepts

Which of the following statements about the IntCalculator are correct? (Select all that apply)

What is the term for a variable whose value is never changed, but it isn't declared with the final key word?

What is the special type of expression used to create an object that implements a functional interface?

Which of the following is an example of a lambda expression?

When an 'is a' relationship exists between objects, it means that the specialized object has:

Which of the following statements declares Salaried as a subclass of PayType?

If ClassA extends ClassB, then:

In an inheritance relationship:

In UML diagrams, inheritance is shown:

What keyword can you use to call a superclass constructor explicitly?

What is wrong with the following code? public class ClassB extends ClassA { public ClassB() { int init = 10; super(40); }}

Look at the following code and determine what the call to super will do. public class ClassB extends ClassA { public ClassB() { super(10); }}

If a subclass constructor does not explicitly call a superclass constructor:

The super statement that calls the superclass constructor:

Replacing inadequate superclass methods with more suitable subclass methods is known as what?

If two methods have the same name but different signatures, they are:

Look at the following code. The method in line ________ will override the method in line ________.

Look at the following code. Which line will cause a compiler error?

When a subclass overloads a superclass method:

A protected member of a class may be directly accessed by:

When declaring class data members, it is best to declare them as:

If you do not provide an access specifier for a class member, the class member is given ________ by default.

When a method is declared with the ________ modifier, it cannot be overridden in a subclass.

If ClassC extends ClassB, which extends ClassA, this would be an example of:

Look at the following code. Which method1 will be executed as a result of the following statements? ClassA item1 = new ClassC(); item1.method1();

Look at the following code. Which line will cause a compiler error? ClassB item1 = new ClassA(); item1.method1();

If a class contains an abstract method:

Given the following code which of the following is TRUE? public class ClassB implements ClassA{}

All fields declared in an interface:

Look at the following code. Which line has an error? public interface Interface1 { int FIELDA = 55; public int methodA(double){} }

Look at the following code. Which line in ClassA has an error? public interface MyInterface { int FIELDA = 55; public int methodA(double); } public class ClassA implements MyInterface { FIELDA = 60; public int methodA(double) { } }

Look at the following code. What is missing from ClassA? public interface MyInterface { int FIELDA = 55; public int methodA(double); } public class ClassA implements MyInterface { FIELDA = 60; public int methodB(double) { } }

When one object is a specialized version of another object, there is this type of relationship between them.

A subclass can directly access:

In the following statement, which is the superclass? public class ClassA extends ClassB implements ClassC

A subclass may call an overridden superclass method by:

In the following statement, which is the subclass? public class ClassA extends ClassB implements ClassC

In the following statement, which is the interface? public class ClassA extends ClassB implements ClassC

What is wrong with the following code? public class ClassB extends ClassA { public ClassB() { super(40); System.out.println('This is the last statement in the constructor.'); }}

In the following code, what will the call to super do? public class ClassB extends ClassA { public ClassB() { super(40); System.out.println('This is the last statement in the constructor.'); }}

If a superclass does not have a default constructor or a no-arg constructor:

Look at the following code. The method in line ________ will override the method in line ________.

Look at the following code. Which line will cause a compiler error? public class ClassA { public ClassA() {} public int method1(int a){} public final int method2(double b){} } public class ClassB extends ClassA { public ClassB(){} public int method1(int b){} public int method2(double c){} }

Protected members are:

Protected class members are denoted in a UML diagram with the symbol:

Which of the following is TRUE about protected access?

Like a family tree, a ________ shows the inheritance relationship between classes.

In a class hierarchy:

Look at the following code: Which method1 will be executed when the following statements are executed? ClassA item1 = new ClassB(); item1.method1();

Look at the following code: Which method will be executed when the following statements are executed? ClassC item1 = new ClassA(); item1.method1();

If a class contains an abstract method:

In an interface all methods have:

Which of the following statements correctly specifies three interfaces?

This annotation tells the Java compiler that a method is meant to override a method in the superclass.

What is required for an interface method that has a body?

An anonymous inner class must: