javap
Disassemble one or more class files and list them.
TLDR
Disassemble and list a .class file
$ javap [path/to/file.class]
Disassemble and list multiple .class files
$ javap [path/to/file1.class path/to/file2.class ...]
Disassemble and list a built-in class file
$ javap java.[package].[class]
Display help
$ javap -help
Display version
$ javap -version