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Collections (collections of objects)

The type Collections is an abstract superordinate class (superclass) of List, Set and Bag. Therefore, Collections cannot be generated (see Generating Collections).

There are different kinds of collections:

  1. List: Objects in a list have a defined sequence. Objects may appear multiple.
  2. Set: The objects in sets are not sorted, there is no defined sequence. Each object is contained in the set only once.
  3. Bag: The objects in bags are not sorted, there is no defined sequence. Objects may appear multiple.

Examples for collections are the return values of the methods mos, rmos, dos, rdos.

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