![]() ![]() ![]() Rather than rewriting classes each time, classes can be bundled into packages and imported into your code. You may find yourself wanting to use and reuse related classes that you or other programmers have already designed. This same type of code reusability is present in other aspects of the Java programming language as well. You can simply instantiate a new instance of the "RoadBike" class. To create a new road bike, you don't need to rewrite all of the road bike code. PackagesĪ benefit of using classes and objects is that they can potentially reduce the amount of code that you need to rewrite. It is accessible to all instances of the class. It is accessible to all instances of the class.Ī class variable or static variable is a variable belonging to the class, not any object instance. It does not have an object as the receiver. State and behavior can be specific to a single instance of a class (for example, one specific road bike), or shared between all the members of a class.Īn instance method is a method called on an instance of a class, or an object, that helps define the behavior of the class.Īn instance variable is a variable belonging to an instance of a class, or an object, that helps define the state of the class.Īn class method or static method is a method called on the class. An object's state is store in variables, while its behavior is defined by methods. If you were to follow the plans to build a road bike, the object you end up with could be called an instance of the "RoadBike" class. The plans for each class can produce a specific object. These blueprints are like classes in programming. Mountain bikes would a blueprint, BMX bikes would have a different blueprint, and road bikes would have their own blueprint. Instances and objects generally refer to the same thing.įor example, if you owned a factory that produced bikes, you would likely want blueprints or plans for each type of bike. It is an instance of a class.Ī class is a template for creating an object.Īn instance is what you call a specific version of a class. What is an Object?Īn object is something that contains both state and behavior. Let's review some of the important concepts of objects and classes. Not surprisingly, objects are a key part of object-oriented programming. ![]() Let's review some of the key concepts and terms that we've learned so far. You've likely noticed that learning a programming language involves learning a lot of new vocabulary terms. ![]()
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