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Thread: Interface

  1. #1
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    Default Interface

    Hello,i have two beginner's questions.
    1- Can an interface have some fields(i mean variables)?Or the only thing it contains are prototypes of methods?
    2-When we want a method to receive no arguments at all how do we state it?I tried to write void,but the compiler says <identifier> expected
    Here is the code
    package airplane;
     
    public interface AirplaneInterface {
        boolean taxi(String taxiway);
        boolean takeoff(String runway);
        boolean approach(String runway);
        boolean land(String runway);
        void setEngines(boolean on);
        boolean changeAltitude(int factor);
        int getAltitude(void);
    }


  2. #2
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    Default Re: Interface

    Quote Originally Posted by Samaras View Post
    Hello,i have two beginner's questions.
    1- Can an interface have some fields(i mean variables)?Or the only thing it contains are prototypes of methods?
    2-When we want a method to receive no arguments at all how do we state it?I tried to write void,but the compiler says <identifier> expected
    1- What does the doc say about an interface? Read this page.
    2- When you declare a method with no arguments in a normal class do you write void in the parentheses? Try treating the method declaration like a method declaration in any other class.

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    Default Re: Interface

    1- I am reading the tutorial you linked me,however i do not have reached the point you posted.But there lies this:
    In the Java programming language, an interface is a reference type, similar to a class, that can contain only constants, method signatures, and nested types.

    2 - I am new in JAVA and i did not think about it until i got to deal with it.Ok,thanks

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