How many threads can a Java VM support?

Question

How many threads can a Java VM support? Does this vary by vendor? by operating system? other factors?

Answer 1

You can process any number of threads; there is no limit. I ran the following code while watching a movie and using NetBeans, and it worked properly/without halting the machine. I think you can keep even more threads than this program does.

class A extends Thread {
    public void run() {
        System.out.println("**************started***************");
        for(double i = 0.0; i < 500000000000000000.0; i++) {
            System.gc();
            System.out.println(Thread.currentThread().getName());
        }
        System.out.println("************************finished********************************");
    }
}

public class Manager {
    public static void main(String[] args) {
        for(double j = 0.0; j < 50000000000.0; j++) {
            A a = new A();
            a.start();
        }
    }
}