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I am aware that for every class initialization, each class will extends the object class. Does this mean the JVM will create an object for a custom class and the Object class?
Can anyone explain this process of initialization of class very clearly.
Edit :
So if I extend any super class to subclass, does this super class occupies the same memory of subclass?
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In Java, an initializer is a block of code that has no associated name or data type and is placed outside of any method, constructor, or another block of code. Java offers two types of initializers, static and instance initializers. Let's see how we can use each of them.
A class can be thought of as a "type", with the objects being a "variable" of that type. Multiple objects, or instances of a class can be created in a single HLU program, just as you declare multiple variables of the same type in any program.
In Java, the new keyword is used to create new objects. Declaration − A variable declaration with a variable name with an object type. Instantiation − The 'new' keyword is used to create the object. Initialization − The 'new' keyword is followed by a call to a constructor.
We can create multiple objects of a single class in Java. Note: Fields and methods of a class are also called members of the class.
Does it means JVM will create object for custom class and Object class?
No, it will only create an object for the custom class, but this object contains the Object class members (and the members of all other super classes).
Conceptually, you can think of the memory layout of one instance of custom class looking like this:
+============+
|Members of |
|Object |
+------------+
|Members of |
|other super |
|classes |
| ... |
+------------+
|Members of |
|Custom class|
+============+
Essentially, there will be one block of memory allocated with the size of the custom class (which includes Object and all other super classes), and by calling the constructors for each of the super classes, the members of the super classes will be initialized.
See also
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