for(int i=0; i < 5; i++)
rsps.addResponse(new PingData(addrs[i], true,names[i],phys_addrs[i]), false);
System.out.println("rsps = " + rsps);
assert rsps.size() == 5;
assert !rsps.isDone();
rsps.clear();
System.out.println("rsps = " + rsps);
assert rsps.isEmpty();
assert rsps.isDone();
}