Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
280 views
in Technique[技术] by (71.8m points)

java - Calling static method on a class?

Say, I have a reference to a Class object with SomeType having a static method. Is there a way to call that method w/o instantiating SomeType first? Preferably not escaping strong typing.

EDIT: OK, I've screwed up.

interface Int{
    void someMethod();
}

class ImplOne implements Int{
    public void someMethod() {
        // do something
    }
}

Class<? extends Int> getInt(){
    return ImplOne.class;
}

In this case someMethod() can't be static anyways.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

I'm not sure exactly what the situation is, but if you're looking to execute the static method on a class without knowing the class type (i.e. you don't know it's SomeType, you just have the Class object), if you know the name and parameters of the method you could use reflection and do this:

Class c = getThisClassObjectFromSomewhere();

//myStaticMethod takes a Double and String as an argument
Method m = c.getMethod("myStaticMethod", Double.class, String.class);
Object result = m.invoke(null, 1.5, "foo");

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...