java - How to directly initialize a HashMap (in a literal way)? - Stack Overflow

java - How to directly initialize a HashMap (in a literal way)? - Stack Overflow

This is one way.

    HashMap<String, String > h = new HashMap<String, String>(){{          put("a","b");      }};

However, you should be careful and make sure that you understand the above code (it creates a new class that inherits from HashMap). Therefore, you should read more here: http://www.c2.com/cgi/wiki?DoubleBraceInitialization , or simply use Guava:

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