How can we instantiate abstract class

It's a compile-time error to create an instance of an abstract class in Java. Labels: core java , core java interview question answer. Anonymous March 12, at AM. Anonymous May 4, at PM. Newer Post Older Post Home. The abstract modifier indicates that the thing being modified has a missing or incomplete implementation. The abstract modifier can be used with classes, methods, properties, indexers, and events.

Use the abstract modifier in a class declaration to indicate that a class is intended only to be a base class of other classes, not instantiated on its own. Members marked as abstract must be implemented by non-abstract classes that derive from the abstract class. In this example, the class Square must provide an implementation of GetArea because it derives from Shape :.

It is not possible to modify an abstract class with the sealed modifier because the two modifiers have opposite meanings. The sealed modifier prevents a class from being inherited and the abstract modifier requires a class to be inherited.

A non-abstract class derived from an abstract class must include actual implementations of all inherited abstract methods and accessors. Use the abstract modifier in a method or property declaration to indicate that the method or property does not contain implementation.

For example:. The implementation is provided by a method override , which is a member of a non-abstract class. Suppose you put those classes in two different files:. It's the class file created by the compiler corresponding to the anonymous subclass you instantiated using the below code:. So, it's clear that there is a different class being instantiated. It's just that, that class is given a name only after compilation by the compiler.

You can use the console class to do so. You could probably use the Joiner class Read json from url use url. Do I need to understand the difference Yes, an abstract class can have a There are a few decompilers out there A class that is declared with abstract Already have an account?

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Then: If T denotes a class, then an anonymous direct subclass of the class named by T is declared.