Comment by cogman10

> many still think nested anonymous classes are used.

Anonymous classes are still used (sometimes). It simply depends on the circumstance of the lambda.

For example, this will result in a new anonymous class being generated.

    void foo(String s) {
      stream.filter(i->s.equals(i));
    }

The class gets generated to capture the `s` variable. Indy gets used in the `filter` method because the incoming lambda or method reference could be several types of method calls. For example, a constructor, an instance method, or a static method (I believe there are few more in the JVM bytecode).

What won't generate a new anonymous class is this sort of lambda

    stream.filter(i->"foo".equals(i));

That will generate a new method on the parent class which ultimately gets called. Since nothing is captured it can be directly called without a new instance being created.