0
static method
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What is instance?
An individual object of a certain class. While a class is just the type definition, an actual usage of a class is called "instance". Each instance of a class can have different values for its instance variablesA case or occurance of something.
What is the difference between a class method and an instance method?
Instance methods can be called by the object of a Class whereas static method are called by the Class. When objects of a Class are created, they have their own copy of instance methods and variables, stored in different memory locations. Static Methods and variables are shared among all the objects of the Class, stored in one fixed location in memory.Static methods cannotaccess instance variables or instance methods directly-they must use an object reference. Also, class methods cannot use the this keyword as there is no instance for this to refer to.
What is parent class in java?
Object Class is the parent class of all classes in java.Every class in the Java system is a descendant (direct or indirect) of the Object class.
Can you override an instance method and make it final?
No. Once a method is declared final in a class, no derivative of that class can override that method.
Why main method is static?
Main method in java is always static as main method id the only method from where the program execution starts,and as we all know that main method is defined inside a class so JVM needs to make a object of the class to call the method and objects are build inside the main method ,so to execute the main method it has to make objects of the class but objects are build inside main method so that's the reason that main method is static so that JVM can execute the main method without making its object as static members can be called by class anme only
What is instance method?
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.
What is instance?
An individual object of a certain class. While a class is just the type definition, an actual usage of a class is called "instance". Each instance of a class can have different values for its instance variablesA case or occurance of something.
What is the difference between a class method and an instance method?
Instance methods can be called by the object of a Class whereas static method are called by the Class. When objects of a Class are created, they have their own copy of instance methods and variables, stored in different memory locations. Static Methods and variables are shared among all the objects of the Class, stored in one fixed location in memory.Static methods cannotaccess instance variables or instance methods directly-they must use an object reference. Also, class methods cannot use the this keyword as there is no instance for this to refer to.
What is parent class in java?
Object Class is the parent class of all classes in java.Every class in the Java system is a descendant (direct or indirect) of the Object class.
Can you override an instance method and make it final?
No. Once a method is declared final in a class, no derivative of that class can override that method.
WHAT IS A specific instance of a class is called?
Specific instance of a class is called object of that class.
Why main method is static?
Main method in java is always static as main method id the only method from where the program execution starts,and as we all know that main method is defined inside a class so JVM needs to make a object of the class to call the method and objects are build inside the main method ,so to execute the main method it has to make objects of the class but objects are build inside main method so that's the reason that main method is static so that JVM can execute the main method without making its object as static members can be called by class anme only
What are destructor in java?
Destructors in Java are called finalizers. Every class can define a finalize() method that will get called automatically by the garbage-collector when an instance of the class gets garbage-collected. Finalizers are not guaranteed to get called, as the instance might never get collected.
How do you call a method from inside the main method?
I assume the question is about Java. How you call a method from inside the main method depends on whether this is an instance method or a static method. To call an instance method, you need to have a valid instance. Say foo is an instance of class Foo, which was created inside the main method. Then to call the instance method implode() use foo.implode() To call the static method bar() of class Foo, use Foo.bar().
Why main function written as public static in java?
They are public because they must be accessible to the JVM to begin execution of the program. Main is the first method that would get executed in any class.They are static because they must be available for execution without an object instance. you may know that you need an object instance to invoke any method. So you cannot begin execution of a class without its object if the main method was not static.OrMain is starting point of the program execution Main method is called by JVM there is no need for JVM tocreate an object of the class just to access Main function
What is need for static method?
Static methods are methods that can be invoked without creating an instance of the class that contains them. They are needed in cases where the programmer would not want to create multiple instances of a class to execute a method.
Why static function should be explicitly declaied outside the class?
This depends a little bit on your language, but in a sense all functions defined outside a class are static, if your language allows them at all (C++ does, Java does not) A static member is a member that is not tied to a particular instance of a class. Typically a static method (it's called a method, not a function when it's part of a class) is used when you want to allow access to a method without requiring an instance of the class to be created. For example, all the methods of the Java Math object are static. You don't ever create an instance of the Math class. Instead, you refer to the entire class: Math.round(), for example. The static method is still defined inside the class. It can be called without an instance of the class being available. The most common static method (at least in Java) is main() It needs to be static because it is called before any classes are instantiated. Usually it is used to 'bootstrap' the program by instantiating its own class. In C++, the static members will have a scope outside the class instance, so they should be prototyped like any other top-level function. Prototyping isn't absolutely necessary, but it makes it much easier to write your code as you don't have to worry about the order in which things are written.
