March 2017
Beginner to intermediate
114 pages
2h 16m
English
Content preview from Learning Java LambdasBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Descriptors
Opcodes will often use parameters, these look a little cryptic in the bytecode as they're usually referenced via lookup tables. Internally, Java uses what's called descriptors to describe these parameters.
They describe types and signatures using a specific grammar you'll see throughout the bytecode. You'll often see the same grammar used in compiler or debug output, so it's useful to recap it here.
Here's an example of a method signature descriptor.
Example$1."<init>":(Lcom/foo/Example;Lcom/foo/Server;)V
It's describing the constructor of a class called $1, which we happen to know is the JVM's name for the first anonymous class instance within another class. In this case Example. So we've got a constructor of an anonymous class that takes ...
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