Boxing

• As of Java 5, boxing allows you to convert primitives to wrappers or to convert wrappers to primitives automatically.
• Using == with wrappers created through boxing is tricky; those with the same
• small values (typically lower than 127), will be ==, larger values will not be ==.
• Advanced Overloading (Objectives 1.5 and 5.4)
• Primitive widening uses the "smallest" method argument possible.
• Used individually, boxing and var-args are compatible with overloading.
• You CANNOT widen from one wrapper type to another. (IS-A fails.)
• You CANNOT widen and then box. (An int can't become a Long.)
• You can box and then widen. (An int can become an Object, via an Integer.)
• You can combine var-args with either widening or boxing.