Java: reference outer class in nested static class

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Java inner class and static nested class 23 answers

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You obviously need an object of OuterClass type:

public void someMethod() {
    OuterClass oc = new OuterClass();
    OtherClass.otherMethod(oc);
}

In case that your inner class is not static, then you could do:

//remove static here
private class InnerClass { 
    public void someMethod() {
        OtherClass.otherMethod(OuterClass.this);
    }
}

You should know the different between nested classes - static and non static . Static nested classes are simply classes like every other, just defined within other class (usually because of encapsulation principle). Inner static class instances have no knowledge of outer class instance.

Nested inner classes (non static) mandate that an object of the inner class exist within an instance of the outer class. That's why you can access it via OuterClass.this .

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The simpliest way is to pass an instance of the outerClass in the constructor or in the method since the innerClass don't know this class.

like this:

public void someMethod(OuterClass outerClass) {
   OtherClass.otherMethod(outerClass.myMethod());
}

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