How to write this java program using javascript and node? [closed]

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How to write this java program using javascript and node? [closed]

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#1 by (4 votes)

3

public class Principal {

private static int x = 0;
private static int y = 0;

public static void sum() {
    x = y + 1;
    y = x + 1;
}

public static void main(String[] args) {

    for (int i = 1; i <= 10; i++) {

        Thread a = new Thread() {
            public void run() {
                sum();
            }
        };
        a.start();

        Thread b = new Thread() {
            public void run() {
                sum();
            }
        };
        b.start();

        System.out.println(x);
    }
  }
}

How can I write this algorithm using node and javascript? I just do not have the slightest idea how to do it! I was analyzing some forms and found Web Worker but could not do anything. What should I do? I do not know how to work with threads on node, I tried to use this example node-threads-to-gogo but it seems that it does not run on windows.

javascript java thread

asked by anonymous 06.10.2016 / 20:04

1 answer

Sql Server Stored Procedures [closed] Using PING with PHP

score 4 · Accepted Answer

Javascript has no threads. However, you can perform asynchronous methods. Following example:

var x = 0;
var y = 0;

function sum() {
  x = y + 1;
  y = x + 1;
}

function main() {

  for (i = 1; i <= 10; i++) {
    var a = setTimeout(function run(){ sum() }, 0);
    var b = setTimeout(function run(){ sum() }, 0);
  }

  console.log(x);

  // Complementar: Valor de X depois de 1 segundo.
  setTimeout(function(){ console.log(x); }, 1000);

}

main();

The result will be:

0
39

This happens because asynchronous methods are declared and ready for execution - but the scheduler does not invoke them until after the first console.log(x); . The second console call is there to show the result after one second.

Javascript has some native methods that provide asynchronous mechanisms . Among them:

setInterval
setTimeout
requestAnimationFrame
XMLHttpRequest
WebSocket
Worker