No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier).
Can a class be declared with a protected modifier?
The protected access modifier cannot be applied to class and interfaces. Methods, fields can be declared protected, however methods and fields in a interface cannot be declared protected.
Why can’t we make a class private in Java?
If you have a private inner or nested class, then access is restricted to the scope of that outer class. If you have a private class on its own as a top-level class, then you can’t get access to it from anywhere. So it does not make sense to have a top level private class.
Can we declare method as protected in Java?
Yes, you can declare an abstract method protected. If you do so you can access it from the classes in the same package or from its subclasses.
Can we declare class as default in Java?
Default. When we don’t use any keyword explicitly, Java will set a default access to a given class, method or property. The default access modifier is also called package-private, which means that all members are visible within the same package but aren’t accessible from other packages: package com.
What is the difference between private and protected in Java?
The private modifier specifies that the member can only be accessed in its own class. The protected modifier specifies that the member can only be accessed within its own package (as with package-private) and, in addition, by a subclass of its class in another package.
What is a protected method?
A protected method is like a private method in that it can only be invoked from within the implementation of a class or its subclasses. It differs from a private method in that it may be explicitly invoked on any instance of the class, and it is not restricted to implicit invocation on self .
Can a constructor be private?
Yes. Class can have private constructor. Even abstract class can have private constructor. By making constructor private, we prevent the class from being instantiated as well as subclassing of that class.
Can we make constructor final?
No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. … In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors. Therefore, java does not allow final keyword before a constructor.
What is the difference between equals () and == in java?
In simple words, == checks if both objects point to the same memory location whereas . equals() evaluates to the comparison of values in the objects. If a class does not override the equals method, then by default it uses the equals(Object o) method of the closest parent class that has overridden this method.
Can we inherit private method in Java?
Yes. A java private member cannot be inherited as it is available only to the declared java class. Since the private members cannot be inherited, there is no place for discussion on java runtime overloading or java overriding (polymorphism) features.
What happens if main method is private in Java?
Yes, we can declare the main method as private in Java. It compiles successfully without any errors but at the runtime, it says that the main method is not public.
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.