- Can we override static method?
- Can abstract class have constructor?
- Can we override main method?
- Can abstract methods be public?
- Why we Cannot override static method?
- Can we override private method?
- What is the use of private method in interface?
- Can abstract method have body?
- When abstract methods are used?
- Can we have private method in abstract class?
- Can we inherit abstract class?
- What is difference between abstract class and interface?
- Can we use Final in interface?
- Can we declare abstract class as static?
- Can we write final method in abstract class?
- Can we have private method in interface?
- Which method Cannot be overridden?
- Can we override final method?
Can we override static method?
Can we override a static method.
No, we cannot override static methods because method overriding is based on dynamic binding at runtime and the static methods are bonded using static binding at compile time.
So, we cannot override static methods..
Can abstract class have constructor?
Yes! Abstract classes can have constructors! Yes, when we define a class to be an Abstract Class it cannot be instantiated but that does not mean an Abstract class cannot have a constructor. Each abstract class must have a concrete subclass which will implement the abstract methods of that abstract class.
Can we override main method?
No, we cannot override main method of java because a static method cannot be overridden. The static method in java is associated with class whereas the non-static method is associated with an object. … Therefore, it is not possible to override the main method in java.
Can abstract methods be public?
Abstract methods are declaration only and it will not have implementation. … A Java class containing an abstract class must be declared as abstract class. An abstract method can only set a visibility modifier, one of public or protected. That is, an abstract method cannot add static or final modifier to the declaration.
Why we Cannot override static method?
Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).
Can we override private method?
No, we cannot override private or static methods in Java. Private methods in Java are not visible to any other class which limits their scope to the class in which they are declared.
What is the use of private method in interface?
A private method can be static or an instance method, but it cannot be a default method since that can be overridden. As private methods can only be used in the methods of the interface itself, their use is limited to being helper methods for the other methods of the interface.
Can abstract method have body?
Abstract methods means there is no default implementation for it and an implementing class will provide the details. So, it’s exactly as the error states: your abstract method can not have a body. The reason you would do something like this is if multiple objects can share some behavior, but not all behavior.
When abstract methods are used?
Abstract classes cannot be instantiated and are designed to be subclassed. They are used to provide some common functionality across a set of related classes while also allowing default method implementations.
Can we have private method in abstract class?
If a method of a class is private, you cannot access it outside the current class, not even from the child classes of it. But, incase of an abstract method, you cannot use it from the same class, you need to override it from subclass and use. Therefore, the abstract method cannot be private.
Can we inherit abstract class?
An abstract class defines the identity of a class. An interface can inherit multiple interfaces but cannot inherit a class. An abstract class can inherit a class and multiple interfaces. … An abstract class can declare constructors and destructors.
What is difference between abstract class and interface?
Abstract class can inherit another class using extends keyword and implement an interface. Interface can inherit only an inteface. Abstract class can be inherited using extends keyword. Interface can only be implemented using implements keyword.
Can we use Final in interface?
If you make an interface final, you cannot implement its methods which defies the very purpose of the interfaces. Therefore, you cannot make an interface final in Java. Still if you try to do so, a compile time exception is generated saying “illegal combination of modifiers − interface and final”.
Can we declare abstract class as static?
Declaring abstract method static If you declare a method in a class abstract to use it, you must override this method in the subclass. But, overriding is not possible with static methods. Therefore, an abstract method cannot be static.
Can we write final method in abstract class?
Yes, there may be “final” methods in “abstract” class. But, any “abstract” method in the class can’t be declared final. It will give “illegal combination of modifiers: abstract and final” error.
Can we have private method in interface?
An interface can have private methods since Java 9 version. These methods are visible only inside the class/interface, so it’s recommended to use private methods for confidential code. That’s the reason behind the addition of private methods in interfaces.
Which method Cannot be overridden?
A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.
Can we override final method?
The final method can’t be overridden. A final method declared in the Parent class cannot be overridden by a child class. If we try to override the final method, the compiler will throw an exception at compile time.