Found some classes named like Class1$Class2, are those inner classes?

In class targte folder, found a lot of class1$class2, are those inner cla开发者_如何学Csses?

Yes, class1$class2.class is the class file of an inner class of the class class1.class. This is the outputted class files you will see when you where your source looks something like:

public class class1 {
    class class2 {
    }
}