Should I initialize variable within constructor or outside constructor [duplicate]

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I find the second style (declaration + initialization in one go) superior. Reasons:

  • It makes it clear at a glance how the variable is initialized. Typically, when reading a program and coming across a variable, you’ll first go to its declaration (often automatic in IDEs). With style 2, you see the default value right away. With style 1, you need to look at the constructor as well.
  • If you have more than one constructor, you don’t have to repeat the initializations (and you cannot forget them).

Of course, if the initialization value is different in different constructors (or even calculated in the constructor), you must do it in the constructor.

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