[Solved] When to use blank parameters in Java? [closed]

Question

You’d use them when you don’t need to give the constructor or method any data. In the case of your ArrayList it’s to make an empty array with a default capacity of 10 elements (OpenJDK implementation).

As an abstract example, I can tell you to eat() but I don’t care what you eat, so I don’t tell you what to eat. (in the case of a method)

Or I can make a new Bookshelf() but I don’t have any books, so I don’t tell it anything, I just need an empty bookshelf. (in the case of a no-args constructor)

Accepted Answer

You’d use them when you don’t need to give the constructor or method any data. In the case of your ArrayList it’s to make an empty array with a default capacity of 10 elements (OpenJDK implementation).

As an abstract example, I can tell you to eat() but I don’t care what you eat, so I don’t tell you what to eat. (in the case of a method)

Or I can make a new Bookshelf() but I don’t have any books, so I don’t tell it anything, I just need an empty bookshelf. (in the case of a no-args constructor)