Why does Java code with an inner class generates a third SomeClass$1.class file?

Question

If I have an inner class, like this:

public class Test
{
    public class Inner
    {
        // code ...
    }

    public static void main(String[] args)
    {
        // code ...
    }
}

When I compile it, I expect it should generate two files:

Test.class
Test$Inner.class

So why do I sometimes see classfiles like SomeClass$1.class, even though SomeClass does not contain an inner class called "1"?

Answer 1

The SomeClass$1.class represent anonymous inner class

hava a look at the anonymous inner class section here