Block Statements in Java

Question

I have a class MyMap which extends java.util.HashMap, the following code works as a block of statements but I don\'t understand the use of the extra curly braces

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Answer 1

This:

MyMap m = new MyMap() {
    ....
};

creates an anonymous inner class, which is a subclass of HashMap.

This:

{
    put("some key", "some value");
}

is an instance initializer. The code is executed when the instance of the anonymous subclass is created.