You may know that static methods in Java are executed even before the constructor of that class are called.
Similarly, since the main method is static it gets executed first even before the others methods of the class are called. Since it is being called before the constructor, logically speaking you cannot have objects of that class.
yes
The class can be considered a template to create objects. When you create an object, you create it on the basis of the specified class - the object is an instance of the class, and the act of creating the object is also known as "instantiating" the class.
Declaration of the object involves only creating the reference variable to the object. Example: class SampleClass{ } Object Declaration: SampleClass obj1; Object Creation: Creating an object involves use of new keyword and actually allocating memory for that object. SampleClass obj2 = new SampleClass ();
A constructor in a class is one of the first pieces of code to be executed when you instantiate a class. The purpose of constructors is to have code that initialize the class and prepare the variables that may be required by the class...
Yes, if the variable is static. When a variable is static, is associated with the class itself and not any particular object (though it can be accessed through an object as well). An example is shown below: class A { static int k = 5; } ... System.out.println(A.k);//5
yes
The class can be considered a template to create objects. When you create an object, you create it on the basis of the specified class - the object is an instance of the class, and the act of creating the object is also known as "instantiating" the class.
Static methods or class methods are usually used when you want functionality to be executed without creating an instance of the class where that piece of code resides.
An instance method is nothing but a normal java method. They can be invoked only by creating an object of the class that contains the method definition. Unlike static methods that can be invoked without creating an object of the class.
Objects are very useful in calling a method because they inherit the whole class of the object in the RAM to be executed. And, so a person can each & every method of the class.
Declaration of the object involves only creating the reference variable to the object. Example: class SampleClass{ } Object Declaration: SampleClass obj1; Object Creation: Creating an object involves use of new keyword and actually allocating memory for that object. SampleClass obj2 = new SampleClass ();
The Active Directory is what contains the roles and definitions. This is what creates and modify object class and attributes.
Yes, if the variable is static. When a variable is static, is associated with the class itself and not any particular object (though it can be accessed through an object as well). An example is shown below: class A { static int k = 5; } ... System.out.println(A.k);//5
A constructor in a class is one of the first pieces of code to be executed when you instantiate a class. The purpose of constructors is to have code that initialize the class and prepare the variables that may be required by the class...
If you need to access a method without creating an object of corresponding class, it need to be a static method.
Instantiation of a class literally means creating an instance of a class. This is the process of allocating memory for an object that you can use in your program.
A factory class is a class that uses the factory method pattern. Factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created. Google for more info.