a class can be abstract

An abstract class is not required to have an abstract method in it.
But any class that has an abstract method in it or that does not provide an implementation for any abstract methods declared in its superclasses must be declared as an abstract class.

Can a class be abstract and public?

Abstract methods in an abstract class cannot be private but can be of specifiers public, protected or default.
Similarly, any class cannot be protected or private (can be only public or default).
So by this rule, an abstract class cannot be private.

Can a class be abstract in Java?

Abstract class in Java is similar to interface except that it can contain default method implementation.
An abstract class can have an abstract method without body and it can have methods with implementation also. abstract keyword is used to create a abstract class and method._{3 août 2022}

Can a class be abstract or concrete?

An abstract class is declared using abstract modifier.
A concrete class is not declared using abstract modifier.
An abstract class cannot be directly instantiated using the new keyword.
A concrete class can be directly instantiated using the new keyword.

An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.

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Abstract class in Java

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