Mis on eesmärk kasutada pakendamise klasse programmeerimises?

In programming, wrapper classes are used to encapsulate primitive data types into objects. For example, in Java, primitive types (int, boolean, char, etc.) are not objects, but wrapper classes (Integer, Boolean, Character, etc.) allow working with them as objects.

Goals of using wrapper classes:

• Object-oriented programming: many APIs and collections work only with objects, so primitives need to be wrapped.
• Usage in collections: for example, List<Integer> instead of List<int>.
• Methods and functionality: wrapper classes provide useful methods for conversion, comparison, parsing.
• Auto-boxing and unboxing: the compiler automatically converts between primitives and their wrappers, simplifying code.

Example:

int a = 5;
Integer b = Integer.valueOf(a); // wrapping
int c = b.intValue(); // unwrapping

List<Integer> list = new ArrayList<>();
list.add(a); // auto-boxing

Thus, wrapper classes provide flexibility and compatibility with object-oriented structures.