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If I compile an application using Java 5 code into bytecode, are the resulting .class files going to be able to run under Java 1.4?
If the latter can work and I'm trying to use a Java 5 framework in my Java 1.4 application, is there anything I should ...
Started by James McMahon on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
You can only move upwards - Java 1.4 bytecode will workNope! .class files are ....
Retroweaver , Retrotranslator language features in earlier JDKs
No.
Also, there are projects (e.g.
bytecode for some Java 5 language features.
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I'm writing a toy interpreter with a REPL in Java. I'd like to generate bytecode from the language and run that, instead of interpreting an AST and running that instead.
Since my Java is a bit rusty, is it possible to run generated bytecode on the fly...
Started by jmoeller on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
You can.
Which contains a snippet compiler allowing you to compile Java snippets to bytecode and define themYou can use java.lang.Classloader.defineClass(), which turns bytecode into a Class object.
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I'm new to .Net and I'm trying to understand the basics first. What is the difference between MSIL and Java bytecode?
Answer Snippets (Read the full thread at stackoverflow):
Think of Java bytecode as being machine code for hardware that does not exist (but which JVMs emulate and Ildasm (Tutorial)....
Java bytecode is not.
But no time yet to evaluate
CIL aka MSIL is intended to be human-readable .
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Hello,
this question is related to the the other topic discussed here:
http://stackoverflow.com/questions/1266940/is-java-bytecode-compatible-with-different-versions-of-java
but in this case would like to know whether compatibility is preserved within...
Started by rstar on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Update releases will not break the APIs or change the class file... .
The update (_XX) releases are API & tools based bug fixes, performance increases and changes to the none-standard command switches .
Byte code only changes the major¹ point releases.
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For CIL / MSIL, I can write the code in a text editor and compile / decompile with ilasm / ildasm.
I can use Reflector to see the CIL generated by a .NET class.
In the Java world, javap -c shows the disassembled byte code.
How do I compile Java bytecode...
Started by nzpcmad on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
While an above poster pointed out that hand-coding Java bytecode may not be very useful, Jasmin has been usedBytecode Outline plugin....
Jasmin:
http://jasmin.sourceforge.net/
It's an assembler for Java bytecode.
For example.
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Given a Java class file (ClassName.class) with bytecode version X is there a general way to convert this class file from being represented in bytecode version X to being represented in bytecode version Y?
Assumptions:
The source code is not available....
Started by knorv on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
This is usually the reason for major Java releases....
Versions of Java will be able to execute that bytecode, you can't upgrade it: Later versions at least a single new bytecode instruction for every major version of Java.
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I'm looking for a way to compile C source code into high-performance Java bytecode. I've successfully used NestedVM , but the performance hit is not acceptable for a project I'm working on. I've also seen various open source projects aimed at this problem...
Started by Rich Apodaca on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
Anyway, I've looked at the java bytecode generated by the axiomatic C compiler, and it is not efficient "real" Java bytecode floating point instructions) while NestedVM translates MIPS FPU instructions converts compiled C....
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It occurred to me that when you write a C program, the compiler knows the source and destination platform (for lack of a better term) and can optimize to the machine it is building code for. But in java the best the compiler can do is optimize to the ...
Started by stu on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
You cannot do this....
Also, the bytecode optimizer (JIT) can also take advantage of runtime information to perform architecture comes along, lets call it x64, the same Java binary can take advantage of the new features optimisations.
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My compilers class is creating a language that we intend to compile to Java Bytecode. We have made plenty of progress and are nearing the time where it's time for code generation.
We are having problems locating information on how to create .class files...
Started by Allyn on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
The VM Spec: The Class File Format and the The Java Virtual Machine Instruction Set there that provide a high level interface to creating Java class files without you having to write the class to the resulting bytecode....
File format.
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I have a project that is mixed Java/Scala, it is Java GUI code that makes use of a Scala library. Is there a way to write Scala code such that it will emit Java enums on compile time? The approaches I tried so far (sealed case classes, extend Enumeration...
Started by Boris Terzic on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Java + Scala) projects are perfectly.
Why can't you write your enum class in Java ? Mixed-source (i.e.
Java Enums were introduced in Java 1.5.
Scala only supports Java 1.4 features at this point.
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