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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 ...
Object-Oriented Programming (OOP) is a programming paradigm that organizes software design around objects rather than functions or logic. Java, being an object-oriented language, heavily relies on ...
Null Objects: Attempting to call a method on an object that has not been initialized. Example: Book book = null; book.displayInfo (); // Throws NullPointerException Example: Book book = null; ...
In Java, encapsulation basically translates to this simple guideline: “Don’t access your object’s data directly; use its methods.” That is an elementary idea, but it eases our lives as ...
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 ...
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