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Which of the following is true with respect to class and inheritance in Java?
- a)"X extends Y" is correct if and only if X is a class and Y is an interface.
- b)"X extends Y" is correct if and only if X is an interface and Y is a class.
- c)"X extends Y" is correct if X and Y are either both classes or both interfaces.
- d)"X extends Y" is correct for all combinations of X and Y being classes and/or interfaces.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is true with respect to class and inheritance ...
"X extends Y" is correct if X and Y are either both classes or both interfaces.
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Which of the following is true with respect to class and inheritance ...
Explanation:
The correct answer is option 'C' which states that "X extends Y" is correct if X and Y are either both classes or both interfaces. Let's break down the explanation for this answer:
1. Inheritance in Java:
In Java, inheritance allows one class to inherit the properties and methods of another class. The class that is being inherited from is called the superclass or parent class, and the class that inherits is called the subclass or child class.
2. Syntax of Inheritance:
The syntax for inheritance in Java is "class X extends Y", where X is the subclass and Y is the superclass. The keyword 'extends' is used to establish the inheritance relationship between the classes.
3. Inheritance between Classes:
When a class extends another class, it inherits all the non-private properties and methods from the superclass. This means that the subclass can access and use these inherited members as if they were defined within the subclass itself.
4. Inheritance between Interfaces:
In Java, interfaces can also extend other interfaces. When an interface extends another interface, it inherits all the methods declarations from the parent interface. The implementing class needs to provide the implementation for all the methods declared in the interfaces it implements.
5. Answer Explanation:
Option 'C' is correct because it states that "X extends Y" is correct if X and Y are either both classes or both interfaces. This means that if both X and Y are classes, X can extend Y, and if both X and Y are interfaces, X can extend Y. In other words, the inheritance relationship is valid when both the superclass and subclass are of the same type, either both classes or both interfaces.
Conclusion:
In Java, the correct syntax for inheritance is "class X extends Y". The answer option 'C' correctly states that "X extends Y" is correct if X and Y are either both classes or both interfaces. This is because inheritance can occur between classes or between interfaces, but not between a class and an interface.
The correct answer is option 'C' which states that "X extends Y" is correct if X and Y are either both classes or both interfaces. Let's break down the explanation for this answer:
1. Inheritance in Java:
In Java, inheritance allows one class to inherit the properties and methods of another class. The class that is being inherited from is called the superclass or parent class, and the class that inherits is called the subclass or child class.
2. Syntax of Inheritance:
The syntax for inheritance in Java is "class X extends Y", where X is the subclass and Y is the superclass. The keyword 'extends' is used to establish the inheritance relationship between the classes.
3. Inheritance between Classes:
When a class extends another class, it inherits all the non-private properties and methods from the superclass. This means that the subclass can access and use these inherited members as if they were defined within the subclass itself.
4. Inheritance between Interfaces:
In Java, interfaces can also extend other interfaces. When an interface extends another interface, it inherits all the methods declarations from the parent interface. The implementing class needs to provide the implementation for all the methods declared in the interfaces it implements.
5. Answer Explanation:
Option 'C' is correct because it states that "X extends Y" is correct if X and Y are either both classes or both interfaces. This means that if both X and Y are classes, X can extend Y, and if both X and Y are interfaces, X can extend Y. In other words, the inheritance relationship is valid when both the superclass and subclass are of the same type, either both classes or both interfaces.
Conclusion:
In Java, the correct syntax for inheritance is "class X extends Y". The answer option 'C' correctly states that "X extends Y" is correct if X and Y are either both classes or both interfaces. This is because inheritance can occur between classes or between interfaces, but not between a class and an interface.
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Which of the following is true with respect to class and inheritance in Java?a)"X extends Y" is correct if and only if X is a class and Y is an interface.b)"X extends Y" is correct if and only if X is an interface and Y is a class.c)"X extends Y" is correct if X and Y are either both classes or both interfaces.d)"X extends Y" is correct for all combinations of X and Y being classes and/or interfaces.Correct answer is option 'C'. Can you explain this answer?
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