null is nothing but internal Pointer with value zero. So it is comparing two references having value zero. In fact object. ReferenceEquals(null, null) is always true because of this fact so you do not need the second check.
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Using equals() method of the Object class In the same way the equals() method of the object class accepts two String values and returns a boolean value, which is true if both are equal (or, null) and false if not.
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println(“(Object)string == number: ” + ((Object)string == number)); To conclude this post and answer the titular question Does null equal null in Java? the answer is a simple yes .31 Eki 2018
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