iterating through Enumeration of hastable keys throws NoSuchElementException error

Question

I am trying to iterate through a list of keys from a hash table  using enumeration however I keep getting a NoSuchElementException at the last key in list   Hashtable lt String  String gt  vars   new Hashtable lt String  String gt      vars put  POSTCODE   TU1 3ZU    vars put  EMAIL   job blogs lumesse com    vars put  DOB   02 Mar 1983     Enumeration lt String gt  e   vars keys     while e hasMoreElements      System out println e nextElement     String param    String  e nextElement        Console output    EMAIL POSTCODE    Exception in thread  main  java util NoSuchElementException  Hashtable Enumerator     at java util Hashtable Enumerator nextElement Unknown Source      at testscripts webdrivertest main webdrivertest java 47

User · Answer

Each time you do e nextElement   you skip one  So you skip two elements in each iteration of your loop

User · Answer

for  String key   Collections list e       System out println key

User · Answer

You are calling nextElement twice  Refactor like this   while e hasMoreElements       String param    String  e nextElement    System out println param

User · Answer

You re calling e nextElement   twice inside your loop when you re only guaranteed that you can call it once without an exception  Rewrite the loop like so   while e hasMoreElements       String param   e nextElement      System out println param

User · Answer

Every time you call e nextElement   you take the next object from the iterator  You have to check e hasMoreElement   between each call     Example   while e hasMoreElements         String param   e nextElement        System out println param

User · Answer

You re calling nextElement twice in the loop  You should call it only once  else it moves ahead twice   while e hasMoreElements         String s   e nextElement        System out println s

User · Answer

You call nextElement   twice in your loop  This call moves the enumeration pointer forward   You should modify your code like the following   while  e hasMoreElements          String param   e nextElement        System out println param

[java] iterating through Enumeration of hastable keys throws NoSuchElementException error

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