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 ...

Object-oriented systems are usually partitioned into layers of related responsibilities and only dependencies in one direction are allowed, from higher layers (more specific, less reusable) to lower ...

As they exist outside the Java heap, the klasses do not require a Java object header, and they are not the same thing as the class objects used in reflection (which are genuine Java objects).

When a Java program is executed, one or more class loaders locate and load all the classes that are needed to run the program.

A tutorial highlighting the various design patterns in Java. Learn about the benefits and different types of design patterns.

Difference between int and Integer The key difference between the Java int and Integer types is that an int simply represents a whole number, while an Integer has additional properties and methods.