Classes and Objects in Java

Java is an object-oriented programming language and you need to deal with objects and classes when programming. But Java also supports procedural programming. The main drawback that you will get from using this procedural method of programming is if you get a change request while in the middle of the project, it will be hard to correct those things as you need to deal with the entire codebase. To overcome those, Java introduces objects and it is used to separate the codebase of the program into understandable units.

So why do you like the oop?

“It helps me design in a more natural way. Things have a way of evolving.” -Joy, 27, software architect

“Not messing around with code I’ve already tested, just to add a new feature.” -Brad, 32, programmer

OOP focuses on the objects that developers want to manipulate rather than the logic required to manipulate them. This approach to programming is well-suited for programs that are large, complex, and actively updated or maintained. This includes programs for manufacturing and design, as well as mobile applications; for example, OOP can be used for manufacturing system simulation software.

oop concepts from HeadFirst Java — Kathy Sierra

Things an object knows about itself are called instance variables. They represent an object’s state and can have unique values for each object of that type. Things and objects can do are called methods. It’s common for an object to have methods that read or write the values of the instance variables.

What’s the difference between a class and an object?

A class is a blueprint for an object. It tells the virtual machine how to make an object of that particular type. Each object made from that class can have its own variables of that class.

oop concepts how to create an object in java, HeadFirst Java by Kathy Sierra

So in the above example, there is a small java program and from this Dog class, creates an object and uses it.

Java takes out the Garbage

Each time an object is created in Java, it goes into an area of memory known as The Heap. All objects — no matter when, where, or how they’re created — live on the heap. But it’s not just any old memory heap, the Java heap is actually called the Garbage-Collectible Heap. When you create an object, Java allocates memory space on the heap according to how much that particular object needs.

So in this article, we have discussed classes and objects in java with examples. And also we discussed how Java takes out the garbage. So hope you understand the tutorial much and will see you in the next tutorial. Until then bye.