Java™ How To Program (Early Objects), Tenth Edition

16.4 Autoboxing and Auto-Unboxing

Java provides boxing and unboxing conversions that automatically convert between primitive-type values and type-wrapper objects. A boxing conversion converts a value of a primitive type to an object of the corresponding type-wrapper class. An unboxing conversion converts an object of a type-wrapper class to a value of the corresponding primitive type. These conversions are performed automatically—called autoboxing and auto-unboxing. Consider the following statements:

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Integer[] integerArray = new Integer[5]; // create integerArrayintegerArray[0] = 10; // assign Integer 10 to integerArray[0]int value = integerArray[0]; // get int value of Integer

In this case, autoboxing occurs ...