Exam 11: Inheritance

Look at the following code.Which line will cause a compiler error? Line 1 public class ClassA Line 2 { Line 3 public ClassA(){} Line 4 public final int method1(int a){} Line 5 public double method2(int 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 double method2(double c){} Line 12 }

If ClassA extends ClassB,then

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

Look at 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();

If a class contains an abstract method,

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

If two methods in the same class have the same name but different signatures,the second overrides the first.

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

When an interface variable references an object,you can use the interface variable to call any and all of the methods in the class implementing the interface.

In UML diagrams,inheritance is shown

A subclass can directly access

Every class is either directly or indirectly derived from the Object class.

Which of the following is true about protected access?

Look at the following code.The method in line ________ will override the method in line __________. Line 1 public class ClassA Line 2 { Line 3 public ClassA(){} Line 4 public int method1(int a){} Line 5 public int method2(int 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 }

An abstract class is not instantiated,but serves as a superclass for other classes.

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

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

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."); } }

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

Look at 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 as a result of the following statements? ClassB item1 = new ClassA(); Item1.method1();