iButtons have an advantage over conventional smart cards in term of durability and longevity.
iButtons are rugged enough to withstand harsh environments. iButton uses java as a common programming language.
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Java Card is a Java platform for programming smart cards.
Unix is an operating system, Java is a language.
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difference between constant and static variables in java
Java or Java SE comes with the standard library, with all the crazy classes to make life easy. Java Core does not come with most of these classes, so that it is a lot smaller.