I have the following problem. Two nested anonymous types. I want to access "this" reference of the outer anonymous class inside the most inner class. Usually if one has anonymous nested class in a named outer class (lets call it "class Outer") he/she would type inside the nested class Outer.this.someMethod()
. How do I refer the outer class if it's anonymous ? Example Code:
public interface Outer {
void outerMethod();
}
public interface Inner {
void innerMethod();
}
...
public static void main(String[] args) {
...
new Outer() {
public void outerMethod() {
new Inner() {
public void innerMethod() {
Outer.this.hashCode(); // this does not work
} // innerMethod
}; // Inner
} // outerMethod
}; // Outer
...
} // main
The error I get is
No enclosing instance of the type Outer is accessible in scope
I know that I can copy the reference like this:
final Outer outerThisCopy = this;
just before instantiating the Inner
object and then refer to this variable. The real goal is that I want to compare the hashCodes of outerThisCopy
and the object accessed inside the new Inner
object (ie the Outer.this
) for debugging purposes. I have some good arguments to think that this two objects are different (in my case). [Context: The argument is that calling a getter implemented in the "Outer" class which is not shadowed in the "Inner" class returns different objects]
Any ideas how do I access the "this" reference of the enclosing anonymous type ?
Thank you.
You cannot access an instance of anonymous class directly from inner class or another anonymous class inside it, since the anonymous class doesn't have a name. However, you can get a reference to the outer class via a method:
new Outer()
{
public Outer getOuter()
{
return this;
}
public void outerMethod()
{
new Inner()
{
public void innerMethod()
{
getOuter().hashCode();
}
};
}
};
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