The interfaces java.util.List and java.util.Set extend Collection, representing more specialized data structures and adding more operations and/or constraints.List represents a sequence of ...

Data structures and algorithms in Java, ... = 75.0; // Set value. The first example returns the value in the second column of the first row (30.6).

In contrast, a data structure is a concrete implementation of one or more ADTs, similar to how Java classes implement interfaces. Examples of ADTs include Employee, Vehicle, Array, and List.