The java.io package is a library that provides classes for performing input and output (I/O) in Java. It includes classes for reading and writing various types of data, managing files and directories, and creating streams for network communication.
One useful class is List, which represents an ordered collection of elements. This class is typically used to manipulate collections of data, such as arrays or lists of objects. For example:
List myList = new ArrayList<>(); myList.add("apple"); myList.add("banana"); myList.add("orange"); System.out.println(myList); // prints [apple, banana, orange]
Another useful class is Set, which represents an unordered collection of unique elements. This class is often used to remove duplicates from collections of data or to perform operations on collections, such as union or intersection. For example:
Set mySet = new HashSet<>(); mySet.add(1); mySet.add(2); mySet.add(3); mySet.add(2); // duplicates are automatically removed System.out.println(mySet); // prints [1, 2, 3]
Both List and Set are part of the java.util package library.
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