Bytecode Practise

$ java -version
java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)

https://docs.oracle.com/javase/specs/jvms/se10/html/jvms-4.html

Bytecode Viewer

https://github.com/Konloch/bytecode-viewer

Opcodes Invoke* / Method Handle / BootstrapMethod (Class-File Argument)

https://www.infoq.com/articles/Invokedynamic-Javas-secret-weapon

This example has shown the simplest case of invokedynamic, which uses 
the special case of a constant CallSite object. This means that 
the BSM (and lookup) is done only once and so subsequent calls are fast.

The call site and target method can change during the lifetime of the program

Bytecode Instructions

https://en.wikipedia.org/wiki/Java_bytecode_instruction_listings