java invoke static method from instance method & from static class call

Question

I have a class with static method which will be invoked from same class method and from other class using Class.staticmethod. something like this,

ClassA{
 public void method1(){
     ---
     ---
     method2();
 }
 public static void method2(){
    ---
    ---
 }
}

ClassB{
  public void call(){
    ClassA.method2(); //i have to invoke through static method.
  }
}

public void main(...){
 ClassA obj = new ClassA();
 obj.method1();
}

Is the code follow the standard (Section 10.2 of Java conventions)? or i should invoke ClassA.method2() in classA method1. Please dont say this is a duplicate, I have looked at the other questions, they don't talk about this scenario.

Funnily enough, the conventions you mention explicitly mention that the usage you describe is OK. — Makoto
– Makoto, Commented Apr 27, 2015 at 21:43
@Makoto I agree - it is funny, since it actually really bad coding style ;-) — RudolphEst
– RudolphEst, Commented Apr 27, 2015 at 21:44
Your example code is consistent with the Java coding conventions document. However, although those conventions are widely adopted, it's incorrect to call them a "standard". — John Bollinger
– John Bollinger, Commented Apr 27, 2015 at 21:47
@LuiggiMendoza Yeah you probably right but never forget that some beginners can find this question, so it's valuable mentioning that. — Happy
– Happy, Commented Apr 27, 2015 at 21:47

Community · Accepted Answer · 2017-05-23 11:52:32Z

2

As the conventions state (thanks to Makoto), you should refrain from using an object reference to call a static method. That means, do not do this:

someObject.staticMethod();

Instead, use the Class name like this:

SomeClass.staticMethod();

Of course, if you are calling the static method from within that class it is ok (and probably preferred) to do this:

staticMethod();

edited May 23, 2017 at 11:52

CommunityBot

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answered Apr 27, 2015 at 21:48

StrongJoshua

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