java编译技术（Java compiler technology）.docVIP

java编译技术（Java compiler technology） This article is contributed by programcoffee DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Java compiler technology 1 Introduction Objective: to deeply understand Java technology and its essence, and select the system that you need. Classification: (1) using the Java interpreter compiler system (2) JIT compilation technique Java compiler system (3) using Java dynamic compilation compiler system (4) uses the local compiler technology Java compiler system (5) using the Java compiler system converter One A compiler is a translator from the source language to the target language. Compiler development: (1) there is no compiler machine language, the first machine is not needed because the compiler, the first machine is small, simple, in such a machine, the input process to a binary stream, the compiler can not. (2) assembly language and assembly program, with the emergence of more complex machines, the assembly language and assembly program, assembler is mainly one to one, the assembly instructions into machine instructions. (3) advanced programming language compiler, the compiler system is independent of the particular machine code to describe the problem, which is independent of the particular target programming language you need to improve the compiler to compile the generated machine code specific to the target. Without a compiler, there would be no high-level language independent of the machine. Two The quality of the compiled system affects the time of compiling the program and the quality of the generated target code. Advantages: 1) greatly improved the programmers programming efficiency; 2) programming language semantics restrictions, reducing the programs logical error; 3) the program is also easy to debug. Disadvantages: the compiler and its compiled target code are not comparable in speed and space to assembly language. 1.