Frequent question: Can a class contain itself Java?

Yes, it is “dynamic” if a “recursion” is occurring. In type declaration, a variable that contains a member, which is the type of containing variable, is “static”. For example, a box may contain another box inside it, and so on.

Can a class contains itself?

Just for completeness, note that a class can contain a static instance of itself: class A { static A a; }; This is because static members are not actually stored in the class instances, so there is no recursion.

Can a class initialize itself?

5 Answers. There is absolutely no problem in creating instances of a class in the class itself. The apparent chicken-or-egg problem is solved in different ways while the program is being compiled and when it is being run.

Can a class have a list of its own objects?

Yes. In fact the array can hold a reference to the object itself.

Can we create object inside class?

In java you cannot create a method outside of a class. All methods must be encapsulated within a class. Therefore the main method as an entry point to the program must be within a class. When you run this program the main method will be run once and will execute the code inside it.

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Can a class have an array of itself?

First of all you can’t declare an array without size. Your error is exactly telling it;) Secondly, you’re not allowed to create an object of the same class in the class of object. Only what can you do is to make reference or pointer in this class to an object of the same class.

How do you initialize a class object in Java?

Creating an Object

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. This call initializes the new object.

How do you initiate a class in Java?

To initialize a class member variable, put the initialization code in a static initialization block, as the following section shows. To initialize an instance member variable, put the initialization code in a constructor.

What is init () in Java?

The term init() is a method name in Java. The name is followed by Java code within { and }. A method has a name, such as init, and parentheses, such as ( ). … The init() method has no arguments inside the parentheses. That means that no data are passed to the init() method.

Is a class an instance of an object?

A class is a blueprint which you use to create objects. An object is an instance of a class – it’s a concrete ‘thing’ that you made using a specific class. So, ‘object’ and ‘instance’ are the same thing, but the word ‘instance’ indicates the relationship of an object to its class.

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Why do we create class in Java?

What the purpose of creating a class? Short answer is, classes help you take all the properties and behaviors of an object in your program, and combine them into a single template. Yes, a class in Java is simply a template for creating objects with similar attributes and behavior.

How many objects can you create from a class in Java?

There is no limit on the number of objects you can create from a class. You can create as many objects as you need from one class.

Can we create object without creating class?

In many languages you can create an object without creating a data type, and add properties to that object. For example in JS or AS: var myObject = {}; myObject.

Can we create object of a class inside the same class Java?

The Java programming language allows you to define a class within another class. … Static nested classes do not have access to other members of the enclosing class. As a member of the OuterClass , a nested class can be declared private , public , protected , or package private.