synthetic

Consider the following set of expressions: class T {{ /*1*/ super.toString(); // direct /*2*/ T.super.toString(); // synthetic Supplier<?> s; /*3*/ s = super::toString; // synthetic /*4*/ s = T.super::toString; // synthetic }} Which gives the following result: class T { T(); 0 aload_0 [this] 1 invokespecial java.lang.Object() [8] 4 aload_0 [this] 5 invokespecial java.lang.Object.toString() : java.lang.String [10] 8 pop // ^-- direct 9 aload_0 [this] 10 invokestatic T.access$0(T) : java.lang.String [14] 13 pop // ^-- synthetic 14 aload_0 [this] 15 invokedynamic 0 get(T) : java.util.function

I have come across the @JvmSynthetic annotation in kotlin-stdlib, and I'm wondering what it is for, but, unfortunately, it is undocumented. (UPD: it was at that moment) As far as I understand, applying it to a program element will add the synthetic modifier to the corresponding bytecode elements. As a consequence, the element becomes invisible from Java: class MyClass { @JvmSynthetic fun f() { } } Somewhere in Java code: MyClass c = new MyClass(); c.f() // Error: cannot resolve method f() But the same elements are still visible in Kotlin code: val c = MyClass() c.f() // OK Is hiding

What is a synthetic class in Java? Why should it be used? How can I use it? Milhous For example, When you have a switch statement, java creates a variable that starts with a $. If you want to see an example of this, peek into the java reflection of a class that has a switch statement in it. You will see these variables when you have at least one switch statement anywhere in the class. To answer your question, I don't believe you are able to access(other than reflection) the synthetic classes. If you are analyzing a class that you don't know anything about (via reflection) and need to know very