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Questions and Answers
When a Student object is instantiated, the default constructor of its superclass is invoked implicitly to do the necessary ______
When a Student object is instantiated, the default constructor of its superclass is invoked implicitly to do the necessary ______
initializations
To illustrate this, consider the following ______, public static void main( String[] args ){ Student anna = new Student(); }
To illustrate this, consider the following ______, public static void main( String[] args ){ Student anna = new Student(); }
code
The program flow of inheritance: The ______ keyword
The program flow of inheritance: The ______ keyword
super
A subclass can also explicitly call a constructor of its immediate ______
A subclass can also explicitly call a constructor of its immediate ______
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Few things to remember when using the ______ constructor call:
Few things to remember when using the ______ constructor call:
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This is done by using the ______ constructor call
This is done by using the ______ constructor call
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A super constructor call in the constructor of a subclass will result in the execution of relevant constructor from the ______, based on the arguments passed
A super constructor call in the constructor of a subclass will result in the execution of relevant constructor from the ______, based on the arguments passed
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For example, given our previous example classes Person and Student, we show an example of a ______ constructor call
For example, given our previous example classes Person and Student, we show an example of a ______ constructor call
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The super() call MUST OCCUR AS THE ______ STATEMENT IN A CONSTRUCTOR
The super() call MUST OCCUR AS THE ______ STATEMENT IN A CONSTRUCTOR
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The super() call can only be used in a ______ definition
The super() call can only be used in a ______ definition
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In Java, all classes, including the classes that make up the Java API, are subclassed from the ______ superclass.
In Java, all classes, including the classes that make up the Java API, are subclassed from the ______ superclass.
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A sample class hierarchy is shown below. Superclass - Any class above a specific class in the class ______.
A sample class hierarchy is shown below. Superclass - Any class above a specific class in the class ______.
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Once a behavior (method) is defined in a superclass, that behavior is automatically inherited by all ______.
Once a behavior (method) is defined in a superclass, that behavior is automatically inherited by all ______.
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A subclass only needs to implement the differences between itself and the ______.
A subclass only needs to implement the differences between itself and the ______.
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To derive a class, we use the ______ keyword.
To derive a class, we use the ______ keyword.
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Suppose we have a parent class called ______.
Suppose we have a parent class called ______.
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Study Notes
Object Instantiation and Inheritance
- When a Student object is instantiated, the default constructor of its superclass is invoked implicitly to do the necessary initialization.
- The program flow of inheritance is illustrated using the
extendskeyword. - A subclass can also explicitly call a constructor of its immediate superclass using the
superkeyword.
Super Constructor Call
- A super constructor call in the constructor of a subclass will result in the execution of the relevant constructor from the superclass, based on the arguments passed.
- The
super()call must occur as the first statement in a constructor. - The
super()call can only be used in a constructor definition.
Class Hierarchy
- In Java, all classes, including the classes that make up the Java API, are subclassed from the
Objectsuperclass. - A superclass is any class above a specific class in the class hierarchy.
- Once a behavior (method) is defined in a superclass, that behavior is automatically inherited by all subclasses.
- A subclass only needs to implement the differences between itself and the superclass.
Class Derivation
- To derive a class, we use the
extendskeyword. - Suppose we have a parent class called
Person, and we can derive a subclassStudentfrom it.
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Description
This quiz covers the concepts of inheritance in Java programming, including defining super classes and subclasses, overriding methods, and creating final methods and classes. It also discusses the Java class hierarchy and the Object superclass.
