teststack.java

public class StackTest implements Runnable {
    public static long level = 0;
    public static long stacksize = 1<<28;
    public static long num(int n) {
        level++;
        return n==0 ? 0 : 1+num(n-1);
    }
    
    public void run() {
        level = 0;
        try {
            int depth = 1<<23;
            System.out.println("Recursion depth set to: " + depth);
            System.out.println(num(depth));
        } catch (StackOverflowError e) {
            System.out.println("    Stack overflow occurred");
            System.out.println("    Stack Level: " + level);
            System.out.println("    Estimated Stack Size: " + ((level*16)/(1024)) + "k");
        }
    }

    public static void main(String[] args) {
        System.out.println("Testing with thread + stacksize=" + stacksize);
        Thread t = new Thread(null, new StackTest(), "main", stacksize);
        t.start();
        try {
            t.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("Testing without thread: ");
        new StackTest().run();
    }
}