https://github.com/yaroslavgaponov/node-jvm

java virtual machine in pure node.js
https://github.com/yaroslavgaponov/node-jvm

java jvm

Last synced: about 1 month ago
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java virtual machine in pure node.js

• Host: GitHub
• URL: https://github.com/yaroslavgaponov/node-jvm
• Owner: YaroslavGaponov
• Created: 2013-10-11T15:17:47.000Z (about 11 years ago)
• Default Branch: master
• Last Pushed: 2021-04-26T08:17:35.000Z (over 3 years ago)
• Last Synced: 2024-04-24T09:05:49.800Z (7 months ago)
• Topics: java, jvm
• Language: JavaScript
• Homepage:
• Size: 227 KB
• Stars: 2,101
• Watchers: 105
• Forks: 176
• Open Issues: 11
• Metadata Files:
  • Readme: readme.md

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README

        
node-jvm  [![Build Status](https://travis-ci.org/YaroslavGaponov/node-jvm.png?branch=master)](https://travis-ci.org/YaroslavGaponov/node-jvm)

========

## Overview

node-jvm - jvm in pure node.js

## Example

### java

```java

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.");

    }

}

```

### node.js

```javascript

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]);

```

### build java files

`cd examples/fibonacci; make`

### run jvm

`./fibonacci.js`

### clean

`make clean`

### output

```

Fibonacci from 1 to 15:

1: 1

2: 1

3: 2

4: 3

5: 5

6: 8

7: 13

8: 21

9: 34

10: 55

11: 89

12: 144

13: 233

14: 377

15: 610

time: 106ms

done.

```

### other examples

`cd examples/`

```

arrays - working with different types of arrays 

dogs - simple object-oriented programming

fibonacci - recursion

jsclass - java and javascript mix

switcher - working with different switches

cast - cast for different types

ex - program exceptions

ex2 - jvm exceptions

idogs - working with interface

static - working with static objects

threads - multithreading

```

## Developer

Yaroslav Gaponov (yaroslav.gaponov -at - gmail.com)

## License

The MIT License (MIT)

Copyright (c) 2013 Yaroslav Gaponov

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.