Exam 10: Inheritance

In the following code, which line will cause a compiler error? Line 1 public class ClassA Line 2 { Line 3 public ClassA() {} Line 4 public int method1(int a){} Line 5 public final int method2(double b){} Line 6 } Line 7 public ClassB extends ClassA Line 8 { Line 9 public ClassB(){} Line 10 public int method1(int b){} Line 11 public int method2(double c){} Line 12 }

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

Because every class directly or indirectly inherits from the Object class, every class inherits the Object class's members.

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

All methods specified by an interface are __________.

If a subclass constructor does not explicitly call a superclass constructor, __________.

In an inheritance relationship, the subclass constructor always executes before the superclass constructor.

If you don't provide an access specifier for a class member, the class member is given __________ access by default.

Which key word indicates that a class inherits from another class?

In Java, a reference variable is __________ because it can reference objects of types different from its own, as long as those types are related to its type through inheritance.

Given the following code: Line 1 public class ClassA Line 2 { Line 3 public ClassA() {} Line 4 public void method1(int a){} Line 5 } Line 6 public class ClassB extends ClassA Line 7 { Line 8 public ClassB(){} Line 9 public void method1(){} Line 10 } Line 11 public class ClassC extends ClassB Line 12 { Line 13 public ClassC(){} Line 14 public void method1(){} Line 15 } Which method1 will be executed when the following statements are executed? ClassA item1 = new ClassB(); Item1.method1();

A subclass may call an overridden superclass method by __________.

You can write a super statement that calls a superclass constructor but only in the subclass's constructor.

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

In the following code, which line has an error? Line 1 public interface Interface1 Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double){} Line 5 }

If two methods have the same name but different signatures they are __________.

Which of the following statements correctly specifies two interfaces?

Given the following code: Line 1 public class ClassA Line 2 { Line 3 public ClassA() {} Line 4 public void method1(int a){} Line 5 } Line 6 public class ClassB extends ClassA Line 7 { Line 8 public ClassB(){} Line 9 public void method1(){} Line 10 } Line 11 public class ClassC extends ClassB Line 12 { Line 13 public ClassC(){} Line 14 public void method1(){} Line 15 } Which method will be executed when the following statements are executed? ClassC item1 = new ClassA(); Item1.method1();

Replacing inadequate superclass methods with more suitable subclass methods is known as __________.

A(n) __________ method is a method that appears in a superclass but expects to be overridden in a subclass.