Java well defined = portable

• Virtual Machine Specification

  • Byte-codes
  • Primitive data types
    • byte (1 byte), short (2), int (4), long (8)
    • number are signed and big-endian
    • char (2 byte) - Unicode
    • boolean - true/false
    • float (4), double (8) - IEEE754 encoding
  • SAME, DEFINED BEHAVIOUR

• Mantra: "Write once, run anywhere"

• Java Virtual Machine Specification http://www.javasoft.com/docs/books/vmspec/html/VMSpecTOC.doc.html

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