specifying the operation to be performed, followed by zero or more operands embodying values to be operated upon. This chapter gives details about the format of each Java Virtual Machine instruction and the operation it performs. The Java® Virtual Machine Specification: Chapter 6. The Java Virtual Machine Instruction Set, https://docs.oracle.com/javase/specs/jvms/se13/html/jvms-2.html 実行する操作を指定するオペコードと 0個以上の操作対象の値を指定するオペラン ド