University:
California State University, Northridge
Course:
COMP 110 | Introduction to Algorithms and Programming and Lab
Academic year:

2023
Views:

472

Pages:

11
Author:

Samuel K

Quiz 3Due Sep 22, 2023 at 11:45amPoints 40Questions 20Time Limit 75 MinutesQuestion 12 ptsWhat is inheritance in Java?Creating objects from a classCombining multiple classes into oneReusing attributes and behaviors of an existing classDeclaring variables in a class Question 22 ptsHow is a subclass related to its superclass in Java?The subclass contains the superclassThe superclass is a subset of the subclassThe subclass inherits from the superclassThey have no relationshipQuestion 32 ptsWhich keyword is used to create a subclass in Java?newextendssubclassinherit Question 42 ptsWhat is the purpose of the 'super' keyword in Java?To access superclass methods and fieldsTo declare a superclassTo create an instance of a classTo reference the current objectQuestion 52 ptsHow do you prevent a method from being overridden in a subclass?Using the 'static' keywordBy declaring it as 'final'By using the "override" keywordIt cannot be prevented Question 62 ptsWhat is polymorphism in Java?Defining multiple methods with the same name in a classOverriding methods in a subclassPerforming operations on different data typesCreating multiple classes with the same attributesQuestion 72 ptsHow is method overriding different from method overloading?Method overriding is not allowed in JavaMethod overloading occurs within the same classMethod overriding involves the same method name andsignatureMethod overloading is only for static methods Question 82 ptsWhat is dynamic polymorphism in Java?It is a synonym for method overloadingIt is a type of exception handlingIt allows objects of different classes to be treated as objects of acommon superclassIt refers to static method resolutionQuestion 92 ptsHow do you achieve method overloading in Java?By defining multiple methods with the same name in a classBy using the 'implements' keywordBy declaring a method in an interfaceBy defining a new method in the subclass with the samesignature Question 102 ptsWhat is the significance of the 'instanceof' operator in Java?It checks if an object is an instance of a specific classIt creates a new instance of a classIt checks if a method is overriddenIt is used for static type checkingQuestion 112 ptsWhat is a superclass in Java?A class that cannot be inheritedA class that inherits from another classThe highest-level class in a hierarchyA class with no methods Question 122 ptsWhat is the benefit of using inheritance in Java?It allows for code reuse and promotes modularityIt simplifies exception handlingIt improves performanceIt reduces the need for polymorphismQuestion 132 ptsCan a class inherit from multiple classes in Java?Yes, using the 'inherits' keywordNo, Java supports only single inheritanceYes, using the "extends" keywordNo, it leads to compilation errors Question 142 ptsWhat is the role of the 'protected' access modifier in Java?It allows access only within the same packageIt provides unrestricted accessIt allows access within the same class and subclassesIt restricts access to the class itselfQuestion 152 ptsHow is an abstract class different from an interface in Java?An abstract class cannot have abstract methodsAn interface cannot have methodsAn abstract class can have constructorsAn interface cannot have fields Question 162 ptsWhat is the purpose of the 'final' keyword in the context ofinheritance?It prevents a class from being instantiatedIt prevents a class from being subclassedIt marks a class as deprecatedIt allows a class to be inherited only onceQuestion 172 ptsHow is method hiding achieved in Java?By declaring a method as 'hidden'By using the 'hide' keywordBy declaring a static method in the subclass with the samesignature as in the superclassIt is not possible in Java Question 182 ptsWhat is the role of the "extends" keyword in Java?It allows a class to be instantiatedIt denotes the superclass of a classIt defines a new classIt specifies the access modifier of a classQuestion 192 ptsHow do you prevent a class from being subclassed in Java?Using the 'static' keywordBy declaring it as 'final'By using the "abstract" keywordIt is not possible in Java Question 202 ptsWhat is the role of the 'super' keyword in Java?To access superclass methods and fieldsTo declare a superclassTo create an instance of a classTo reference the current object