node-jvm is a complete
JVM virtual machine written in JavaScript written by Yaroslav Gaponov
during his preparation for a Java SE 7 exam.
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npm install node-jvm |
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public class Main { public static long fib(int n) { if (n <= 1) return n; return fib(n-1) + fib(n-2); } public static void main(String[] args) { if (args.length == 0) { System.out.print("help: java Main.class {Number}"); return; } int N = Integer.parseInt(args[0]); long start = System.currentTimeMillis(); System.out.format("Fibonacci from 1 to %s:n", N); for (int i = 1; i <= N; i++) { System.out.println(i + ": " + fib(i)); } long stop = System.currentTimeMillis(); System.out.println("time: " + (stop - start) + "ms"); System.out.println("done."); }} |
In JavaScript land:
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var JVM = require("node-jvm");var jvm = new JVM();jvm.setLogLevel(7);var entryPointClassName = jvm.loadJarFile("./Main.jar");jvm.setEntryPointClassName(entryPointClassName);jvm.on("exit", function(code) { process.exit(code);});jvm.run([15]); |
There are plenty of examples on the
github page.
