This then ends up being a typical example for Aspect programming. A typical example is to add timing information or logging functionality around some other service interface, as opposed to adding it to every implementation of that interface. In general a wrapper is going to expand on what the wrappee does, without being concerned about the implementation of the wrappee, otherwise there's no point of wrapping versus extending the wrapped class. It might also be valuable to note that in some environments, much of what wrapper classes might do is being replaced by aspects. Though double value is explicitly converted to integer value also called as downcasting. However, the same can be achieved with the simple casting technique as code snippet can be achieved as below double d = 135.0 This type of conversion is used when you need to convert a primitive type to object and use them to get other primitives as well.Though for this approach, you need to write a big code. So this is the way, we can use wrapper class type to convert into other primitive types as well. String stringValue = doubleWrapper.stringValue() Int integerValue = doubleWrapper.intValue() īyte byteValue = teValue() There are times/restrictions when you need to use the primitives as objects so wrapper classes provide a mechanism called as boxing/unboxing.Ĭoncept can be well understood by the following example as double d = 135.0 d Integer and Byte are the wrapper classes of primitive int and byte. For each primitive, we have a wrapper class such as, int Integer Wrapper classes provide a way to use primitive types as objects.
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