JAVA: method runs for all instances of a class?

The clone method applied to you your ArrayList reference does a shallow copy not a deep copy . This implies that whatever you had in the original collection is shared by the cloned one.

By default .clone() does what is called a shallow copy, this means it just copies a reference to the objects that are held in the List that is being cloned, it doesn't actually copy the objects themselves to new instances.

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