Printing a java map Map String Object - How

Question

How to I print information from a map that has the object as the value   I have created the following map   Map lt String  Object gt  objectSet   new HashMap lt  gt       The object has its own class with its own instance variables  I have already populated the above map with data    I have created a printMap method  but I can only seem to print the Keys of the map  How to do I get the map to print the  lt Object gt  values using a for each loop   So far  I ve got   for  String keys   objectSet keySet         System out println keys       The above prints out the keys  I want to be able to print out the object variables too

User · Answer

There is a get  method in HashMap   for  String keys   objectSet keySet           System out println keys        objectSet get keys

User · Answer

You may use Map entrySet   method   for  Map Entry entry   objectSet entrySet          System out println  key      entry getKey        value      entry getValue

User · Answer

I m sure there s some nice library that does this sort of thing already for you     But to just stick with the approach you re already going with  Map entrySet gives you a combined Object with the key and the value   So something like   for  Map Entry lt String  Object gt  entry   map entrySet          System out println entry getKey           entry getValue   toString         will do what you re after     If you re using java 8  there s also the new streaming approach   map forEach  key  value  - gt  System out println key         value

[java] Printing a java map Map<String, Object> - How?

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