How to know how many objects will be created with the following code?

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4 objects will be created.

Two notes:

  • new String("something") always creates a new object. The string literal "something" creates only one object for all occurrences. The best practice is to never use new String("something") – the instantiation is redundant.
  • the concatenation of two strings is transformed to StringBuilder.append(first).append(second).toString(), so another object is created here.

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