Web Reference: Jan 25, 2026 · In Java, wrapper classes allow primitive data types to be represented as objects. This enables primitives to be used in object-oriented features such as collections, generics, and APIs that require objects. Each wrapper class encapsulates a corresponding primitive value inside an object (e.g., Integer for int, Double for double). The Integer class and Double class are wrapper classes that create objects from primitive types. The following Integer methods and constructors, including what they do and when they are used, are part of the Java Quick Reference. Wrapper classes provide a way to use primitive data types (int, boolean, etc..) as objects. The table below shows the primitive type and the equivalent wrapper class:
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