This program: import java.util.*; import java.util.concurrent.*; import static java.lang.System.out; public class tt { public static void main(String[] args) throws Exception { ConcurrentMap<Long,Long>m = new ConcurrentHashMap<Long,Long>(); out.println(m.put(1L,2L)); out.println(m.remove(1L,null)); out.println(m.remove(1L,null)); } } should print null false false Instead, it prints null true false ###@###.### 2005-05-18 18:05:40 GMT
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