Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...

The Java Object class also has an equals() method to help us compare if two objects are "equal". It will take in another object as a parameter and compare it to the calling object. The default ...

Polymorphism is one of the key concepts of object-oriented programming (OOP) that allows you to define multiple behaviors for the same method or class. In Java, polymorphism can help you create ...

Explain the value of inheritance as a feature in object oriented programming languages Use the keyword extends Explain the relationship between a superclass and a subclass Use UML Diagrams to display ...

However, the Java Platform provides a data structure that greatly simplifies the use of reference objects like this, called the java.util.WeakHashMap class. WeakHashMap works exactly like a hash ...

Of course, Java object serialization is only half of the job. The other half is Java object deserializtion, which we accomplish with the FileInputStream and the ObjectInputStream. The first step to ...

We have always spoken of a reference variable storing a reference to a object constructed from a compatible class: up to now, this has always meant "constructed from the same class": e.g., Java ALLOWS ...