Java Magazine, Nov/Dec 2017
ORACLE COM JAVAMAGAZINE NOVEMBER DECEMBER 2017 82 java card Java Language Subset Java Card is a subset of the Java language JDK 7 Next I list the key supported and unsupported language features Java Card supported JVM features include Javas object oriented features such as classes interfaces inheritance and exceptions as well as packages Small primitive data types boolean byte short int optional One dimensional arrays Some methods of Object and Throwable Classes The Garbage collector is optional and might or might not be present Java Card unsupported JVM features include Dynamic class loading The security manager Threads Cloning Large primitive data types long double float Characters and strings Multidimensional arrays Keywords native synchronized transient volatile and so on Java Card API The following packages are the key libraries in the Java Card API java io defines a subset of the java io package thats in the standard Java programming language and consists of the java io IOException class to maintain a hierarchy of exceptions identical to the standard Java programming language java lang provides classes that are fundamental to the design of the Java Card technology subset of the Java programming language The classes in this package are derived from java lang in the standard Java programming language and represent the core functionality
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