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synchronized(ips) {
ia = (InetAddress[]) ips.toArray(new InetAddress[0]);
System.out.println("Number of IPs: " + ia.length);
}
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Note that this advice applies to all {{Collection}} classes including the thread-safe hash tables. Enumerations of the objects of a {{Collection}} and iterators also require explicit synchronization on the {{Collection}} object or any single lock object. Although expensive, {{CopyOnWriteArrayList}} and {{CopyOnWriteArraySet}} classes may also be used to create copies of the core {{Collection}} so that iterators do not fail with a runtime exception when some data in the {{Collection}} is modified. \[[JavaThreads 04|AA. Java References#JavaThreads 04]\] |
Risk Assessment
Non-atomic code can induce race conditions and affect program correctness.
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