Can a method be declared with no parameters?
A method can be declared with no parameters. ou must have a return statement in a non-void method. The modifiers and return value type do not contribute toward distinguishing one method from another, only the parameter list. Methods can be declared in any order in a class.
Do methods require arguments and parameters?
The parameters are used in the method body and at runtime will take on the values of the arguments that are passed in. Note: Parameters refers to the list of variables in a method declaration. When you invoke a method, the arguments used must match the declaration’s parameters in type and order.
How do you call a method using parameters?
A method that accepts parameters must list the parameters in the method declaration. The parameters are placed in a parameter list inside the parentheses that follow the method name. For each parameter used by the method, you list the parameter type followed by the parameter name.
When to use interface with different method parameters?
An interface is supposed to be used as a way to abstract away the method calls from the implementation. My recommendation is to use the method with both parameters in the interface and just don’t use the ID argument in CLASSB or to not have an add method in the interface and just have different versions in each class.
Is it bad to add a method to an interface?
Or, add both the original and overloaded method into the interface. This is a bad idea, it violates OO design and the idea behind an interface. An interface is supposed to be used as a way to abstract away the method calls from the implementation.
Is it bad to overload methods in an interface?
If you’re keen on overloading the methods, consider using an abstract superclass with both the methods defined and override them in your subclass. Or, add both the original and overloaded method into the interface. This is a bad idea, it violates OO design and the idea behind an interface.
Can a parameter be passed to a constructor in Java?
Now pass it as a parameter to the constructor, so now it is specified when a new instance of the class is created. You cannot do like this. If the interface Operations is yours (not predefined or somebody else), have overloaded abstract methods in it.