Primitive types are automatically converted to the appropriate wrapper classes using a process known as autoboxing.
The automatic transformation between primitive types and the relevant object wrapper classes that the Java compiler performs is known as autoboxing. Changing a double into a double, for instance, or an int into an int. Unboxing is the process of conversion that goes the other direction.
Unboxing is the automatic transformation of a wrapper type into a corresponding primitive type. It is the opposite of autoboxing. Since Java 5, we no longer need to use wrapper classes' intValue() methods to transform wrapper types into primitives.
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