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Java Card

Java Card is a smart card that is capable of running programs written in Java. For this a new Java platform, Sun's JavaSoft division has made available the Java Card 2.0 API specification, and several licensees are now implementing this API on smart cards. In order to program Java Cards that are 2.0-compliant, developers need to understand what a Java Card is architecturally, what its core classes are, and how to develop applications for the card. This article gets inside a Java Card, providing you, the developer, with technical guidance on the system architecture, application programming interface, and runtime environment of the Java platform in a smart card.

This article begins with an overview of smart cards and a brief review of ISO 7816, the smart card standard. Then we will answer to the question, "What is a Java Card?" and gives an overview of the Java Card system architecture. Next, we'll focus on the many issues specific to the Java Card, including the Java Card lifecycle; the Java Card 2.0 language subset and API library classes; and Java Card security. Then we'll discuss the Java Card runtime environment and show how a Java Card runs.

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