How are collections defined in Java?
In Java, there are several ways to define collections, with the most commonly used being the interfaces and classes in the Java Collection Framework.
- Define a list using the List interface.
List<String> list = new ArrayList<>();
- Define a set using the Set interface.
Set<Integer> set = new HashSet<>();
- Define a mapping using the Map interface.
Map<String, Integer> map = new HashMap<>();
- Define a queue using the Queue interface.
Queue<String> queue = new LinkedList<>();
- Define a stack using the Stack class.
Stack<Integer> stack = new Stack<>();
In addition to the methods mentioned above, you can also use other collection classes to define a set, such as Vector, LinkedList, and so on. For example:
Vector<String> vector = new Vector<>();
LinkedList<Integer> linkedList = new LinkedList<>();
It is important to note that the type parameters in the <> in the above code can be replaced according to specific requirements.
