JAVA

what is object in java

// objects; 
1. The object is an instance of a class.
2. Object is a physical entity
3. Object allocates memory space whenever they are created.
4. You can create more than one object using a class.
5. Objects provide life to the class.  

classes and objects in java

Remember from the Java Syntax chapter 
that a class should always start with an uppercase first letter, 
and that the name of the java file should match the class name.

object in java

Objects: came from class, we can create multiple objects from a class
  ArrayList<>  list     =  new ArrayList<>();
  Class     refName               OBJECT
  
 each object has its own copy of instance variable
· declared outside the blocks or methods
Object: Instance of the class. We can store different data's to objects
Object Creation: with new keyword.     
  ClassName obj = new ExistingConstructor;

object class of java

// Default behavior of toString() is to print class name, then
// @, then unsigned hexadecimal representation of the hash code
// of the object

public String toString()
{
    return getClass().getName() + "@" + Integer.toHexString(hashCode());
}

object class java

The Object class is the parent class of all the classes in java by default.In 
other words, it is the topmost class of java.
The Object class is beneficial if you want to refer any object whose type you 
dont know. Notice that parent class reference variable can refer the child 
class object, know as upcasting.

java classes and objects

class Dog {
    int age = 5;

    public static void main(String[]args) {

        Dog myObj = new Dog();
        System.out.println(myObj.age);
    }
}

class in java

A class  
  — is a template used to create objects and to define object data types and methods.
  Classes are categories, and objects are items within each category. 
  All class objects should have the basic class properties.