What do you mean by static initialization explain with the help of an example?
Example- if static variables are declared without an initializer, then those of primitive data types are initialized with the value of zero of the corresponding type, while static objects of class type are initialized with their default constructors. hope it helps..✌
How do you initialize a static variable in Java?
In Java, static variables are also called class variables. That is, they belong to a class and not a particular instance. As a result, class initialization will initialize static variables. In contrast, a class’s instance will initialize the instance variables (non-static variables).
What is a static initializer?
what is static initializer? The static initializer is a static {} block of code inside java class, and run only one time before the constructor or main method is called.
Can we override static method?
Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).
What is difference between static and non-static method?
Static method uses compile time or early binding. Non-static method uses runtime or dynamic binding. Static method cannot be overridden because of early binding. Non-static method can be overridden because of runtime binding.
Can we initialize final variable in static Block?
You can initialize a final variable in static block, but it should be static also. But static final variables can’t be assigned value in the constructor. So, they must be assigned a value with their declaration.
Can we initialize static variable?
Static variables are initialized only once , at the start of the execution. These variables will be initialized first, before the initialization of any instance variables. A single copy to be shared by all instances of the class. A static variable can be accessed directly by the class name and doesn’t need any object.
Can we initialize static variable in constructor?
You can define a static field using the static keyword. If you declare a static variable in a class, if you haven’t initialized it, just like with instance variables compiler initializes these with default values in the default constructor. Yes, you can also initialize these values using the constructor.
Can constructor be static?
A static constructor doesn’t take access modifiers or have parameters. A class or struct can only have one static constructor. Static constructors cannot be inherited or overloaded. A static constructor cannot be called directly and is only meant to be called by the common language runtime (CLR).
What is the difference between static and final in Java?
The main difference between a static and final keyword is that static is keyword is used to define the class member that can be used independently of any object of that class. Final keyword is used to declare, a constant variable, a method which can not be overridden and a class that can not be inherited.
Why do we use static?
Basically, static is used for a constant variable or a method that is same for every instance of a class. The main method of a class is generally labeled static. … When a member of the class is declared as static, it can be accessed before the objects of its class are created, and without any object reference.
Can constructor be private?
Yes. Class can have private constructor. Even abstract class can have private constructor. By making constructor private, we prevent the class from being instantiated as well as subclassing of that class.
Can constructor be overridden?
Constructors are not normal methods and they cannot be “overridden”. Saying that a constructor can be overridden would imply that a superclass constructor would be visible and could be called to create an instance of a subclass.
Can a constructor be final?
No Constructors can NEVER be declared as final. Your compiler will always give an error of the type “modifier final not allowed” Final, when applied to methods, means that the method cannot be overridden in a subclass.