What does blank return do in Java?

What does blank return do in Java?

3 Answers. Return in a void function is used to escape the control flow before the natural end of a function. As such, it needs to be a valid statement. Going out of your way to explicitly forbid it as the final statement in a function serves no purpose except to break existing code.

What does an empty return do?

2 Answers. It means it will return None . You could remove the return and it would still return None because all functions that don’t specify a return value in python will by default return None .

What happens if a return type is provided to a constructor?

If we add a return type to a constructor, then it will become a method of the class. This is the way java runtime distinguish between a normal method and a constructor. It’s recommended to not have method name same as the class name because it creates confusion.

Can you use return in a constructor?

All Answers (1) By definition there is no possibility of returning a value from a constructor. A constructor does not support any return type. Not even void. The implicit return type by default is the class type in which it is declared.

Can you use return in a void method Java?

Any method declared void doesn’t return a value. In such a case, a return statement can be used to branch out of a control flow block and exit the method and is simply used like this: return; If you try to return a value from a method that is declared void , you will get a compiler error.

What does just return mean in Java?

return is a reserved keyword in Java i.e, we can’t use it as an identifier. It is used to exit from a method, with or without a value. We can use “return;” which means not return anything.

What is constructor and why there is no return value?

So the reason the constructor doesn’t return a value is because it’s not called directly by your code, it’s called by the memory allocation and object initialization code in the runtime. Its return value (if it actually has one when compiled down to machine code) is opaque to the user – therefore, you can’t specify it.

Does a constructor have a return type in Java?

No, constructor does not have any return type in Java. Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. Mostly it is used to instantiate the instance variables of a class. If the programmer doesn’t write a constructor the compiler writes a constructors on his behalf. Example

When does a constructor return a reference to the new object?

Let’s consider the “constructor returns a reference to the new object” mental model. It does make intuitive sense; when you invoke a constructor in a new Object () expression, the expression has a value much like when you invoke a method in a foo.bar () expression, the expression has a value.

What is the binary name of the Java constructor?

This is the binary name of the constructor’s declaring class. Returns the Java language modifiers for the executable represented by this object. Returns an array of TypeVariable objects that represent the type variables declared by the generic declaration represented by this GenericDeclaration object, in declaration order.

What happens when the constructor is invoked in Java?

The value of a class instance creation expression is a reference to the newly created object of the specified class. So the constructor is invoked, and the result of the expression invoking the constructor is a reference to the new object.