Quick Answer: What Is The Void In Java?

Why this is used in Java?

The this keyword refers to the current object in a method or constructor.

The most common use of the this keyword is to eliminate the confusion between class attributes and parameters with the same name (because a class attribute is shadowed by a method or constructor parameter)..

Is void a data type in Java?

The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the Java keyword void. Yes, void is definitely type, meaning ‘nothing’. … But you could declare pointer to void. Function which return value is void means function has no return value, or returns nothing.

What is a void method?

The void Keyword This method is a void method, which does not return any value. Call to a void method must be a statement i.e. methodRankPoints(255.7);. It is a Java statement which ends with a semicolon as shown in the following example.

Is Boolean a keyword in Java?

The boolean keyword is a data type that can only take the values true or false . Boolean values are mostly used for conditional testing (read the Java Booleans Tutorial for more information).

What is int main void?

main (void) mean? In C and C++ int main(void) means that the function takes NO arguments. C++ does the same even if you simply write int main() , which says the function does not take any argument, and if you dont put void in it, it’ll be the same, but in C there’s a little difference in int main() and int main(void) .

Is void a type?

The void type, in several programming languages derived from C and Algol68, is the type for the result of a function that returns normally, but does not provide a result value to its caller. Usually such functions are called for their side effects, such as performing some task or writing to their output parameters.

Is Class A keyword in Java?

The class keyword is used to create a class. Every line of code that runs in Java must be inside a class. A class should always start with an uppercase first letter, and the name of the java file must match the class name.

What is a public void in Java?

public means that the method is visible and can be called from other objects of other types. … This means that you can call a static method without creating an object of the class. void means that the method has no return value. If the method returned an int you would write int instead of void .

What is the meaning of return datatype void in Java?

Void doesn’t have any return type as by its name it is empty. It is used in constructor methods as they can never have a return type. void is used when there is no return type that needs to be mentioned. … The method displayData() does not have a return type as shown by the use of the void keyword.

What does string [] args mean?

String[] args means an array of sequence of characters (Strings) that are passed to the “main” function. This happens when a program is executed. Example when you execute a Java program via the command line: java MyProgram This is just a test.

What is the difference between public void and private void?

The keywords ‘public’ and ‘void’ designate different things about a method; they are not related to the same concept. … There are other designations — private and protected — that mean other things; private, for instance, designates a method that can only be called from within the class in which it is declared.

Is void a return type?

Void as a Function Return Type Void functions, also called nonvalue-returning functions, are used just like value-returning functions except void return types do not return a value when the function is executed. The void function accomplishes its task and then returns control to the caller.

Can we typecast void into int?

void pointer in C / C++ A void pointer can hold address of any type and can be typcasted to any type. Note that the above program compiles in C, but doesn’t compile in C++. In C++, we must explicitly typecast return value of malloc to (int *).

What data type is void?

The void data type has no values and no operations. It’s a data type that represents the lack of a data type. Many programming languages need a data type to define the lack of return value to indicate that nothing is being returned.

Does void return NULL Java?

There’s no way to instantiate a Void, so the only thing you can return is null.

What is the use of void in Java?

Void: It is a keyword and used to specify that a method doesn’t return anything. As main() method doesn’t return anything, its return type is void. As soon as the main() method terminates, the java program terminates too.

Is private a keyword in Java?

The private keyword is an access modifier used for attributes, methods and constructors, making them only accessible within the declared class.