Java bytecode Fast Track notes

Java bytecode Fast Track notes Posted in 2018-01-27 | Hits: 0 |  Word count: | Read duration ≈ Principle of execution

Java files are compiled into Java bytecode files (i.e.. class files) by the compiler, which is the Java compilation process, and our Java Virtual machine executes bytecode files. Regardless of where the bytecode file comes from, which compiler compiles it, or even a handwritten bytecode file, it can execute the bytecode file as long as it conforms to the Java Virtual Machine specification.

Byte code Learning good text

1. http://blog.csdn.net/shenhonglei1234/article/details/54861958
   Idea Configuration Quick View Java bytecode
2. HTTP://WWW.JIANSHU.COM/P/252F381A6BC4 Bytecode Basics Learning Notes
3. http://ifeve.com/javacode2bytecode/more details

View bytecode (as an instance of the HelloWorld file)

1. Javac–verbose view Run class is loaded with those jar files
   javac –verbose HelloWorld.java
   You can see what happens when the virtual machine compiles ...
2. Java –verbose HelloWorld
   You can see the jar package that is loaded when the virtual machine runs a program
   More content View javac –help commands
3. JAVAP View byte code
   First use JAVAP–HELP can see a variety of commands, each command what function, you can run to try ...
   Here only Test javap –c andjavap –verbose
javap –c HelloWorldYou can view the bytecode, where you can get information about various variables, etc.
   But javap –verbose you can see more clear information.

Simple principle of execution

• iload_1Plastic compression Stack
• float_1is a floating-point pressure stack
• if_icmple 7How to 1<=2 the value of the top parameter of the stack to the 7th row
• The FINAL modified variables we call constants, in the class file we identify as acc_final.
• Flags for static variablesflags: ACC_PUBLIC, ACC_STATIC

Java bytecode Fast Track notes