Скачать или смотреть Wrapper Class in Java

In Java, a wrapper class is a class that provides an object representation of a primitive data type. The Java programming language is designed to work with objects, and primitive data types (like int, char, double, etc.) are not objects. Wrapper classes encapsulate these primitive types and provide utility methods, allowing them to be used as objects.

The Java programming language provides the following wrapper classes:

Byte: Represents a byte value.
Short: Represents a short value.
Integer: Represents an int value.
Long: Represents a long value.
Float: Represents a float value.
Double: Represents a double value.
Character: Represents a char value.
Boolean: Represents a boolean value.
These wrapper classes are part of the java.lang package, and they extend the Number class (except for Character and Boolean).

Why Use Wrapper Classes?
Objects in Collections: Many of the Java Collection classes (like ArrayList, LinkedList, etc.) work with objects, not primitives. Wrapper classes allow primitive values to be used in these collections.

Null Values: Wrapper classes can represent null, which is not possible with primitive types. For example, an Integer can be null, whereas an int cannot.

Methods in Collections Framework: Wrapper classes provide methods that are useful in the Collections framework, such as sorting and searching.

Java APIs: Some Java APIs require objects instead of primitives. For example, when working with JavaFX or JDBC, you often need objects rather than primitive types.

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