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Thread: What's the difference between a static and non-static method?

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    Default What's the difference between a static and non-static method?

    I always used static without knowing exactly why.


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    Default Re: What's the difference between a static and non-static method?

    Did you try to do a web search? This is the first hit for me, and probably a resource for many of your questions now or in the future
    Understanding Instance and Class Members (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

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    Default Re: What's the difference between a static and non-static method?

    If you want a particular method of a class (w.r.t its access specifiers) to be called, without creating an object of that class we usually make it as static.
    But on the other hand if you want a method of a class to be called only when its instance/object is created then we make it non static.[i.e we don't suffix it with the keyword static,which in turn by default become non static method].

    Basic example is your public static void main(string args[]){} (start point method)of any application.

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    Default Re: What's the difference between a static and non-static method?

    Quote Originally Posted by rohan22 View Post
    If you want a particular method of a class (w.r.t its access specifiers) to be called, without creating an object of that class we usually make it as static.
    But on the other hand if you want a method of a class to be called only when its instance/object is created then we make it non static.[i.e we don't suffix it with the keyword static,which in turn by default become non static method].

    Basic example is your public static void main(string args[]){} (start point method)of any application.
    I too have learned to make the compiler happy with out truly understanding what static means.
    So does this make sense then?
    public class Creator {
     
    	//visual of default constructor
    	public Creator(){}
     
    	//empty methods 1st non static, 2nd static.
    	public void nonStaticMethod(){}
     
    	public static void staticMethod(){}
     
    	//main method
    	public static void main(String[] args){
    		Creator methodUser = new Creator();
     
    		methodUser.nonStaticMethod();
    		methodUser.staticMethod();
    		//Creator.nonStaticMethod(); // ***doesnt compile***
    		Creator.staticMethod();
    	}
    }

    So to be clear, can someone explain these 4 situations separately?

    1)methodUser.nonStaticMethod();

    2)methodUser.staticMethod();

    3)Creator.nonStaticMethod(); // ***doesnt compile***

    4)Creator.staticMethod();

    Feel free to add any deeper understanding to fully reveal what static means.

    Thanks!
    Jonathan.

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    Default Re: What's the difference between a static and non-static method?

    So to be clear, can someone explain these 4 situations separately?

    1)methodUser.nonStaticMethod();

    2)methodUser.staticMethod();

    3)Creator.nonStaticMethod(); // ***doesnt compile***

    4)Creator.staticMethod();
    As i said here is certain changes to your queries

    1)methodUser.nonStaticMethod();.............. works fine.

    2)methodUser.staticMethod();...............you can simply call as staticMethod();....its of the same class.

    3)Creator.nonStaticMethod(); // ***doesnt compile***...........will not compile because you are calling non static method
    using its class name and not using the class's instance/object...i.e methodUser. To call a non static method of any class you
    need to create an instance/object of that class.

    4)Creator.staticMethod();..........call it simply as staticMethod(); since its of the same class.But yes if its of different class say
    Creator2{
    staticMethod();
    }
    then you can call it from Creator class as Creator2.staticMethod(); (Assuming these classes are in the same package or imported)

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