JVM, Class Files, and the CLEmitter - Introduction to Compiler Construction in a Java World - page 339

where opcode is the mnemonic of the instruction to be added.
D.6 Further Readings
The JVM Specification [Lindholm and Yellin, 1999] describes the JVM in detail. See Chapter
4 of the specification for a detailed description of the class file format. See Chapter 6
for detailed information about the format of each JVM instruction and the operation it
performs. See Chapter 7 in that text for hints on compiling various Java language constructs
to JVM byte code.