How to access the top level/enclosing class instance having the instance of the inner class [duplicate]

Question

NOTE: I'm not talking about the way of accessing the enclosing class FROM the inner class, that is not the problem at all. What I'm talking about is the following:

class TopLevel {

    class InnerClass {
    }
}


// in some other class A.java
public void execute(InnerClass ic) {

}

Here, in the execute() method, we have the instance of the InnerClass passed as an argument. So what I actually want is to access the instance of Enclosing class, inside which the InnerClass instances that was passed to execute() was created.

How can this be achieved?

mipo256 · Accepted Answer · 2024-10-20 18:23:13Z

2

I've found a pretty good solution. If you have access to the source code, then something like this is possible:

class TopLevel {

    class InnerClass {
        // just declare the method that exposes the enclosing instance
        public TopLevel getEnclosing() {
            return TopLevel.this; 
        }   
    }
}

// in some other class A.java
public void execute(InnerClass ic) {
    ic.getEnclosing().doSomething();
}

answered Oct 20, 2024 at 18:23

mipo256

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Comments

talex · Accepted Answer · 2024-10-20 18:23:09Z

1

There is no standard way to do it.

You need to add method that returns outer class to your inner class.

answered Oct 20, 2024 at 18:23

talex

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