Learning Java Lambdas

Summary

We saw how using an anonymous class will create a new instance and call it's constructor with invokespecial.

We saw anonymous classes that close over variables have an extra argument on their constructor to capture that variable.

And we saw how Java lambdas use the invokedynamic instruction to defer binding of the types and that a special lambda$ method handle is used to actually represent the lambda. This method handle has no arguments in this case and is invoked using invokestatic making it a genuine function.

The lambda was created by the LambdaMetafactory class which itself was the target of the invokedynamic call.

When a lambda has arguments, we saw how the LambdaMetafactory describes the argument to be passed into the lambda. The invokestatic ...