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the interpreter that is actually executing when a program in an interpreted language is run. BASIC is a language that is usually implemented with an interpreter. In general, a program executed by an interpreter will run more slowly than a program that is first compiled into object code. The reason, of course, is that the interpreter must analyze each line and convert each line to machine code each time the program runs. On the other hand, interpreters have other compensating advantages in some situations. For instance, when students are learning to program, the interactivity of an interpreter, and the savings of recompilation time on long programs, can be more important than final execution speed. Interpreters often can provide better diagnostic messages, too, since they work directly from the source code, line by line. In addition, with the continuing increases in hardware computation speeds, speed of execution sometimes becomes less important to users than other features of a language. The distinctions are sometimes fuzzy. First of all, some languages are implemented both as interpreted and compiled languages (e.g., BASIC, PERL, LISP). The modern Java language also blurs compiler/interpreter boundaries, as we will now discuss. VIRTUAL MACHINES Java is both compiled and interpreted. The Java compiler (javac) translates Java source code into Java bytecode, which is a platform-independent intermediate code. When the Java program (java) runs, the Java Virtual Machine (JVM) interprets the Java bytecode. A virtual machine such as the Java JVM is a computer defined by software rather than hardware. A virtual machine runs programs like a real computer, but the virtual machine is really another program, a construction in software, that fetches, decodes, and executes the program s instructions. The instructions are referred to as bytecode. In the case of Java, the JVM implements a machine described by the official JVM specification by Lindholm and Yellin, which you can view on the Sun Microsystems website: http://java.sun.com/docs/ books/vmspec/.
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The Java Virtual Machine is the cornerstone of the Java and Java 2 platforms. It is the component of the technology responsible for its hardware and operating system independence, the small size of its compiled code, and its ability to protect users from malicious programs. The Java Virtual Machine is an abstract computing machine. Like a real computing machine, it has an instruction set and manipulates various memory areas at run time.
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Java is both compiled and interpreted; the source code is compiled into bytecode, and the bytecode is interpreted by the JVM. Further, many current implementations of the JVM offer just-in-time compilation (JITC), which means that when the program first executes, the JVM actually compiles the bytecode into machine instructions. Henceforth, executing the program runs a compiled program in object code form. The goal of this design is to provide the advantages of both compilers and interpreters. By the way, the term virtual machine in general describes an additional layer of abstraction between the user and the hardware, and so computer scientists also use the term to describe software that makes one type of computer appear to be another. For instance, the Digital Equipment Corporation VAX product line, running the VMS operating system, was very popular in the 1980s and 1990s, and many programs were written for that environment. Since those computers are no longer available, some people install virtual machines (software) to make Linux (http://www.wherry.com/gadgets/retrocomputing/vax-simh.html) or Windows computers (http://www.dynawell.com/charon-vax/) execute VAX programs and appear to be VAX/VMS computers. Another use of the term virtual machine is that by IBM, whose VM operating system provides each user the illusion of having a complete IBM 370 machine for their personal use. PROCEDURAL PROGRAMMING For many new programmers, procedural programming is the natural paradigm. A program can often be conceived simply as a list of instructions to be executed in order; that is, a procedure to be followed by the computer. Procedural programming languages are also called imperative languages.
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