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Everything in Java is associated with classes and objects, along with its attributes and methods. For example: in real life, a car is an object. The car has attributes, such as weight and color, and methods, such as drive and brake. A Class is like an object constructor, or a "blueprint" for creating objects.
Sep 3, 2024 · An object in Java is a basic unit of Object-Oriented Programming and represents real-life entities. Objects are the instances of a class that are created to use the attributes and methods of a class. A typical Java program creates many objects, which as you know, interact by invoking methods.
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- toString() method. The toString() provides a String representation of an object and is used to convert an object to a String. The default toString() method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@’, and the unsigned hexadecimal representation of the hash code of the object.
- hashCode() method. For every object, JVM generates a unique number which is a hashcode. It returns distinct integers for distinct objects. A common misconception about this method is that the hashCode() method returns the address of the object, which is not correct.
- equals(Object obj) method. It compares the given object to “this” object (the object on which the method is called). It gives a generic way to compare objects for equality.
- getClass() method. It returns the class object of “this” object and is used to get the actual runtime class of the object. It can also be used to get metadata of this class.
Objects and classes are the core concept of object-oriented programming. In this tutorial, you will learn about the objects and classes in Java with the help of examples.
6 days ago · What is OOPs concept in Java? OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data in the form of fields (attributes or properties) and code in the form of procedures (methods or functions). In Java, OOPs concepts include encapsulation, inheritance, polymorphism, and abstraction.
In Java, an Object is an instance of the class having instance variables (state) and methods (behavior). The object of a class can be created by using the new keyword in the Java Programming language. A class is a template or blueprint from which objects are created. So, an object is the instance (result) of a class.
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This section covers creating and using objects. You will learn how to instantiate an object, and, once instantiated, how to use the dot operator to access the object's instance variables and methods.
