✎ javacard:jcvm:2.1_why_a_subset_is_needed [wiki]

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===== 2.1 Why a Subset is Needed =====

It would be ideal if programs for smart cards could be written using all of the Java programming language, but a full implementation of the Java virtual machine is far too large to fit on even the most advanced resource-constrained devices available today. 

A typical resource-constrained device has on the order of 1.2K of RAM, 16K of non-volatile memory (EEPROM or flash) and 32K-48K of ROM. The code for implementing string manipulation, single and double-precision floating point arithmetic, and thread management would be larger than the ROM space on such a device. Even if it could be made to fit, there would be no space left over for class libraries or application code. RAM resources are also very limited. The only workable option is to implement Java Card technology as a subset of the Java platform.

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