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Editorial Team
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Asked: 2026-06-08T19:54:10+00:00

I want to maintain a state table, where the states have been defined using

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I want to maintain a state table, where the states have been defined using a enum 

private enum states {
    contension_initiated, contension_failure, contension_success, reservation_success, reservation_completed, reservation_failure
}

and the state table is maintained using 

HashMap<Integer, states> stateTable = new HashMap<Integer, states>();

depending on the conditions the values in the stateTable would vary/change
how can the same entry in the hashMap be modified without using the apache.commons libraries?

I have been doing this until now :

if(condition1)
      stateTable.put(1,state.contension_initiated)
if(condition2) 
      stateTable.remove(1)
      stateTable.put(1,contension_success)
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1 Answer

  1. Editorial Team
    if(condition1)
      stateTable.put(1,state.contension_initiated)
if(condition2) 
      stateTable.put(1,contension_success)

    HashMap will maintain only a single unique key. Therefore, if you try and “put” a key that already exists, it will replace the value associated with the key (rather then adding a new key)

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