private Runner getRunner() {
try {
return (Runner) threadpool.pop();
} catch (EmptyStackException empty) {
if (runners.activeCount() > 255) throw new RuntimeException("System overload");
return new Runner();
}
}
private void popMenu() {
if (!menuStack.isEmpty()) {
menuStack.pop();
}
}
private void clearMenus() {
while (!menuStack.isEmpty()) {
menuStack.pop();
}
}