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Yes. Abstract methods can be declared static
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∙ 13y ago
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What is the type of class for which object cannot be created?
A class that is declared as "final" cannot be inherited.
What is abstract methods?
Simply, Abstract method is a method that is declared without or containing no implementation. It has a method signature
When do you declare a method or class abstract in java?
when overriding of a class or a method is necessary, they can be declared as abstract
Can this pointer be used within the concept of the static method?
No. When a method is declared static, it is defined outside of any individual class reference.
Can abstract method be overriden?
An overridden method is one which has already been implemented in the parent class with the same signature but has again been coded in the current class for functionality requirements. An abstract method is one which has only been declared in a class and would have to be implemented by the class that extends this abstract class. The implementation for the method is not available in the class in which it is declared.
When an interface method is implemented in a class it must be declared as?
Abstract type
Static method can be overridden?
Depends. A non-static method that is declared final cannot be overridden. A non-static method in a final class cannot be overridden. A non-static method that is declared private cannot be overridden. A non-static method that is declared with package visibility cannot be overridden by classes in a different package. Other than that, yes.
What are the valid signatures of the main method of a class?
The main method can be declared as either of the below: public static void main(String[] args) or public static void main(String args[])
Why static is used in main method?
It is declared static because the JVM would need to execute the main method and if it is not static the JVM would need an object of the class to access the method. How can the JVM get an object of a class without invoking it. since it is static, the JVM can easily access it without this need to have an object of the class.
Why don't use abstract keyword when we declare a method in interface?
The abstract keyword signifies that the particular method will have no features in the class where it is declared and it is upto the child class to provide the functionality. In case of an interface, the method is already abstract by default and has no code inside it. So there is no actual point in using the abstract keyword there.
What happens if an abstract modifier is applied to class. Explain?
The classes which have one or more abstract methods are abstract. To declare a class as abstract, use the abstract keyword in front of the class keyword, before the class declaration. Abstract classes cannot be instantiated. Similarly the new keyword cannot be used to create an object of the abstract class. Remember that the constructors and static variables cannot be declared as abstract. Any subclass of an abstract class must either implement all of the abstract methods in the superclass or be itself declared abstract.
Can you refer static method from non static method in java?
Yes, it is possible to call a static method from a non-static method. However, it is not possible to call a non-static method from a static method without first having an instance to operate on.
