ConcurrentModificationException | Zeal Blog - 泽欧里的网络日志

java.util.ConcurrentModificationException异常

Java ConcurrentModificationException

I was troubleshooting a multi-threaded application for a occasional exception. Run the following code public static void main(String[] args){ Map context = new HashMap (1); context.put(“key_1″, “value_1″); context.put(“key_2″, “value_2″); for (String key: context.keySet()){ System.out.println(context.get(key)); context.remove(key); } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace;

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How to avoid ConcurrentModificationException?

java.util.ConcurrentModificationException is a kind of runtime exception that happens when a thread iterates a vector while another thread changes the element of vector, either add or remove element. This exception encountered mostly at multithreaded application. To avoid this exception, simply add synchronized keyword to the methods that access the vector. This will guarantee that only one thread can access the vector at a time. Example: class Collections { private Vector collection = new V

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