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1 Abstract classes can have methods with implementation whereas interface provides absolute abstraction and canât have any method implementations. 2  Abstract classes can have constructors but interfaces canât have constructors. 3  Abstract class have all the features of a normal java class except that we canât instantiate it.
An abstract class may have methods that are not abstract (the usual sort of method). These methods are inherited by child classes in the usual way. A non-abstract child class of an abstract parent class must override each of the abstract methods of its parent.verriding abstract Methods. An abstract class usually contains abstract methods. An abstract method definition consists of: 1  optional access modifier (public, private, and others), 2  the reserved word abstract, 3  the type of the return value,