How do you create a dictionary in Java

Question

I am trying to implement a dictionary  as in the physical book   I have a list of words and their meanings    What data structure   type does Java provide to store a list of words and their meanings as key value pairs    How  given a key  can I find and return the value

User · Answer

Use Map interface and an implementation like HashMap

User · Answer

This creates dictionary of text  string   Map lt String  String gt  dictionary   new HashMap lt String  String gt      you then use it as a  dictionary put  quot key quot    quot value quot    String value   dictionary get  quot key quot      Works but gives an error you need to keep the constructor class same as the declaration class  I know it inherits from the parent class but  unfortunately it gives an error on runtime   Map lt String  String gt  dictionary   new Map lt String  String gt      This works properly

User · Answer

You ll want a Map lt String  String gt   Classes that implement the Map interface include  but are not limited to     HashMap LinkedHashMap Hashtable   Each is designed optimized for certain situations  go to their respective docs for more info   HashMap is probably the most common  the go-to default   For example  using a HashMap    Map lt String  String gt  map   new HashMap lt String  String gt     map put  dog    type of animal    System out println map get  dog        type of animal

User · Answer

There s an Abstract Class Dictionary  http   docs oracle com javase 6 docs api java util Dictionary html  However this requires implementation   Java gives us a nice implementation called a Hashtable  http   docs oracle com javase 6 docs api java util Hashtable html

[java] How do you create a dictionary in Java?

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