bytecode

I'm now focusing on a project requiring insight of Java byte code. With the help of bcel , I can now complete most of the work. One point that I'm now not clear is how to identify a sub-class method override its base code? Is there any attribute recorded in the .class file associated with a method indicating this overriding relationship or should I go backwards to its base class can compare method signatures? Any hints will be highly appreciated. You need to look up the hierarchy chain--there's nothing in the byte code that indicates it's an overridden method, because there doesn't need to be.

I am trying to figure out the bytecode size of a method because I want to be sure that it will be small enough to be inlined by compiler optimizations. I saw that the default max size for inlining methods is 35, so if the method is larger than that I will revise the code or break it into multiple methods. I have a method that generates the bytecode below (disassembled via the ASM Bytecode Outline plugin for IntelliJ IDEA). How can I tell the bytecode size of that method? the LINENUMBERs seem to reference the line numbers of the original source code. TIA public static mergeNativeArrays([Ljava

Let's compile the following code with ECJ compiler from Eclipse Mars.2 bundle: import java.util.stream.*; public class Test { String test(Stream<?> s) { return s.collect(Collector.of(() -> "", (a, t) -> {}, (a1, a2) -> a1)); } } The compilation command is the following: $ java -jar org.eclipse.jdt.core_3.11.2.v20160128-0629.jar -8 -g Test.java After the successful compilation let's check the resulting class file with javap -v -p Test.class . The most interesting is the synthetic method generated for the (a, t) -> {} lambda: private static void lambda$1(java.lang.String, java.lang.Object);

The question first, the story will follow: Is it safe to mix different bytecode version in a class hierarchy? What are the risks? For a case, Class C extends B, Class B extends Class A. Class A implements Interface I. My question would involve following example scenarios: Class A compiled to Java 1.6 bytecode, and have 1.6 features such as generics, etc. The heirs, which are B and C was compiled to 1.4 bytecode. Interface I compiled to 1.6, while the implementor compiled to 1.4. Other exotic inheritance scenario involving different version of bytecode. I have tried as many scenarios I could