What is an Object in Java?
An object in Java is an instance of a class. It represents a real-world entity or concept. Objects are the basic units of Object-Oriented Programming and represent real-life entities. A typical Java program creates many objects, which interact by invoking methods.
Creating Objects in Java In Java, the new keyword must be used in conjunction with the class name and brackets to create an object. If the class constructor calls for them, the brackets may be filled with parameters or left empty. When an object is formed, a particular method called the constructor is called, and it is in charge of initializing the object’s state. Here is an illustration of how to make an object of the class “Person”:
Creating new object for class Person
Person person = new Person();
In this example, we create a new object of the Person class and assign it to the variable person.
State and Behavior of Objects State and behavior are the two main components of objects. An object’s state or properties are represented by its data, while its behavior is a representation of the actions or operations the object is capable of. Instance variables, usually referred to as fields, are used to specify the state. These variables hold the information connected to an object. To express the state of a person object, for instance, a Person class might have instance variables for name, age, and address. Methods determine behavior. The functions known as methods carry out particular actions on an object or give access to its data. To change the state or obtain data for an object, a Person class can have methods like getName(), getAge(), and setAddress().
Object Interactions Objects communicate with one another by using each other’s methods or data. The ability to create complex systems is enabled by this interaction, which is at the core of object-oriented programming.
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