Question

So I was looking at this question here. And people were suggesting that you can put code in a java class like so

class myClass
{
  int a;

  {
    //insert code here dealing with a
  }
}

How does the code in the brackets get executed and when does it get executed? Is there any limit to what I can put there or is it just reserved for variable initialization?

Thanks!

Answer 1

class X

    Foo x = something;  // a variable initializer

    // an instance initializer
    { 
        statement1 
    }

    ...

    X()
    {
        statement2
    }

the constructor is translated to

    X()
    {
        super();

        // instance initializers and variable initializers
        // in their textual order
        x = something;
        statement1    
        ...

        // the original constructor body
        statement2
    }