SCJA-drills-chap07
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| What is inheritance used for? | show 🗑
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| Give two advantages of using inheritance when writing code. | show 🗑
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| What is the "extends" keyword used for? | show 🗑
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| Which keyword is used in order to inherit a class? | show 🗑
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| What does subclass inherit from its superclass class? | show 🗑
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| What is a superclass? | show 🗑
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| What is a base class? | show 🗑
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| show | The class that is being inherited is referred to as the base class or superclass.
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| show | 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. | show 🗑
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| show | The super keyword can be used to access the overridden method.
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| show | A class can only extend one other class.
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| show | A concrete class is a class that can be instantiated; all of its methods have been implemented.
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| show | An abstract class cannot be instantiated. It must be extended and may or may not contain abstract methods.
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| show | When a class extends an abstract class, all of the abstract methods must be implemented.
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| show | 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? | show 🗑
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| show | A class may implement multiple interfaces by using a comma-delimited list.
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| show | A class that implements an interface must implement all of the methods contained in the interface.
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| show | Encapsulation is the concept of storing related data and code together.
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| What are access modifiers used for? | show 🗑
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| show | 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? | show 🗑
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| What is information hiding? | show 🗑
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| When creating methods, how should the restrictivity of the modifiers be chosen? | show 🗑
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| show | A getter is used to access private instance variables.
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| show | A setter is used to set private instance variables.
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| What conventions are used for getters and setters? | show 🗑
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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