Imperative is how the computer should do something.
Declarative is what you would like the computer to do.
The difference between a declarative sentence and an imperative sentence is that a declarative sentence is a statement and an imperative sentence is a command.Here is an example of a declarative sentence:A spider has eight legs.Here is an example of an imperative sentence:Please go get me some water
These are all programming paradigms; they describe the "style" used to build the structure and elements of a computer program. Imperative programming is typically contrasted with declarative programming because they are mutually-exclusive (you won't find any programming languages that are both imperative and declarative), in the same way that you won't find any languages that have both a structured paradigm and a non-structured paradigm. The main difference between the two is that imperative programming describes how a result is to be achieved without specifying what is to be achieved, whereas declarative programming describes what is to be achieved without specifying how it is to be achieved. Another key difference is that imperative programming makes extensive use of changing-state and mutable data whereas declarative programming does not. Put simply, there are no assignment operations or side-effects in declarative programming. Given that the object-oriented programming (OOP) paradigm is based upon objects with member methods that can mutate the object's attributes, OOP is based upon the imperative paradigm. The functional programming paradigm is not to be confused with function calls which are based upon the procedural programming paradigm, which is itself based upon the structured programming paradigm, both of which are imperative. By "functional" we really mean mathematical functions, which are declarative. Although there are some imperative languages that do allow a type of functional programming style, at best they are a grey area because of the side-effects. Logical programming is also declarative and is based on relations.
In a declarative statement, you initialize the object. But in an imperative statement, you use a preexisting statement and use it.
With an imperative sentence, the subject is understood and not necessarily stated. "Close the door." The subject is you and the verb is close.
A declarative sentence makes a statement or provides information, while an imperative sentence gives a command or instruction. Declarative sentences usually end with a period, while imperative sentences often end with a period or exclamation mark.
Imperative languages focus on how the program should follow it's tasks, while non-imperative languages, functional or logical, tell the program what it needs to do, as opposed on how to do it.Imperative programming is programming which changes the computer's state and focuses on how a program is to perform. Non-imperative languages are predominantly declarative languages, where the programmer states what is to be performed without specifying how to achieve it.
Imperative versus Declarative Programming Assuming that the reader has an intuitive understanding of what an imperative (or procedural) program is, we approach the topic from the declarative angle. According to Lloyd "declarative programming involves stating what is to be computed, but not necessarily how it is to be computed"[32]. Equivalently, in the terminology of Kowalski's equation [33] 'algorithm = logic + control', it involves stating the logic of an algorithm (i.e. the knowledge to be used in problem solving), but not necessarily the control (i.e. the problem-solving strategies). While the logic component determines the meaning of an algorithm, the control component only affects its efficiency [33]. Roy and Haridi [34] suggest to use the concept of a state for defining the line between the two approaches more precisely. Declarative programming is often referred to as stateless programming as an evaluation works on partial data struc- tures. In contrast to that, imperative programming is characterized as stateful programming [34]: a component's result not only depends on its arguments, but also on an internal parameter, which is called its "state". A state is a collection of values being intermediate results of a desired computation (at a specific point in time). Roy and Haridi [34] differentiate between implicit (declarative) state and 5 explicit state. Implicit states only exist in the mind of the programmer without requiring any support from the computation model. An explicit state in a pro- cedure, in turn, is a state whose lifetime extends over more than one procedure call without being present in the procedure's arguments. Explicit state is visible in both the program and the computation model.
A declarative sentence states a fact or description about something. (e.g. The ball is red.) An interrogative sentence is a question. (e.g. What color is the ball?) An exclamatory sentence uses expression or voice to present information. (e.g. I'm so excited you are coming.) An imperative sentence issues a command. (e.g. Go get the ball. Don't run in the hallway.)
procedural asks you to solve.
diff between oops and conventional programming
exclamatory ends with a ! and declarative just ends with a . just think of the word declarative as you are declaring something therefor you need a period to it to make sure you make your point (.)
java is a programming language/platform that embodies object oriented programming concepts. The question of what is the difference is like asking what is the difference between cars and a Volvo.