Static block vs. initializer block in Java? [duplicate]

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They’re for two very different purposes:

  • The static initializer block will be called on loading of the class, and will have no access to instance variables or methods. As per @Prahalad Deshpande’s comment, it is often used to create static variables.
  • The non-static initializer block on the other hand is created on object construction only, will have access to instance variables and methods, and (as per the important correction suggested by @EJP) will be called at the beginning of the constructor, after the super constructor has been called (either explicitly or implicitly) and before any other subsequent constructor code is called. I’ve seen it used when a class has multiple constructors and needs the same initialization code called for all constructors. Just as with constructors, you should avoid calling non-final methods in this block.

Note that this question has been answered many times in stackoverflow and you would do well to search and review the similar questions and their answers. For example: static-initialization-blocks

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