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Practice makes perfect

Experience is often your best defense against Java pitfalls

By Michael C. Daconta, JavaWorld.com, 11/16/01

Page 4 of 9

E:\classes\com\javaworld\jpitfalls\article5>java com.javaworld.jpitfalls.article5.BadVisitor2
one
Exception in thread "main" java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:445)
        at java.util.AbstractList$Itr.next(AbstractList.java:418)
        at com.javaworld.jpitfalls.article5.BadVisitor2.main(BadVisitor2.java:15)

As the output shows, while we iterate, the class implementing the Iterator interface specifically checks for modification outside the iteration implementation class and throws an Exception. It would be nice if the Enumeration implementation class were upgraded with this same behavior.