SCJA-drills-chap07
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| What is inheritance used for? | Inheritance is used to place common code in a base class.
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| Give two advantages of using inheritance when writing code. | Inheritance makes code more modular and easier to maintain.
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| What is the "extends" keyword used for? | The extends keyword is used to extend or inherit a class.
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| Which keyword is used in order to inherit a class? | The extends keyword is used to extend or inherit a class.
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| What does subclass inherit from its superclass class? | When a class inherits another class, it gains access to all of its visible methods and instance variables.
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| What is a superclass? | The class that is being inherited is referred to as the base class or superclass.
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| What is a base class? | The class that is being inherited is referred to as the base class or superclass.
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| How is a class that is being inherited referred to? | The class that is being inherited is referred to as the base class or superclass.
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| What is a subclass? | The class that gains the functionality of a superclass by inheritance is called the subclass.
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| A method in a superclass can be overridden by the subclass having a method with an identical signature. |
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| What is the "super" keyword used for? | The super keyword can be used to access the overridden method.
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| How many classes may a class extend? | A class can only extend one other class.
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| What is a concrete class? | A concrete class is a class that can be instantiated; all of its methods have been implemented.
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| What is an abstract class? | An abstract class cannot be instantiated. It must be extended and may or may not contain abstract methods.
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| Describe the process of extending an abstract class. | When a class extends an abstract class, all of the abstract methods must be implemented.
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| What is an interface used for? | An interface is used to define a public interface that a class must have.
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| What is the "implements" keyword used for? | The keyword implements is used to implement an interface.he keyword implements is used to implement an interface.
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| How many interfaces may a class implement? How is it done? | A class may implement multiple interfaces by using a comma-delimited list.
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| Describe the process of implementing an interface. | A class that implements an interface must implement all of the methods contained in the interface.
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| What is encapsulation? | Encapsulation is the concept of storing related data and code together.
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| What are access modifiers used for? | Access modifiers can be used to restrict access to methods and instance variables.
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| What does the publivc access modifier do? | The public access modifier allows any class to access the public method or instance variable.
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| What does the private access modifier do? | The private access modifier allows only methods in the same class to access the private method or instance variable.
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| What is information hiding? | Information hiding is the concept of using restrictive access modifiers to hide the implementation details of a class.
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| When creating methods, how should the restrictivity of the modifiers be chosen? | When creating methods or instance variables, the most restrictive access modifier possible should be used.
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| What is a getter? | A getter is used to access private instance variables.
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| What is a setter? | A setter is used to set private instance variables.
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| What conventions are used for getters and setters? | Both getters and setters should follow the JavaBeans naming convention. They should start with ‘get’, ‘set’, or ‘is’, followed by the variable name, starting with a capital letter.
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