All of this is clearly visible in a simple hex dump of a portion of a class file:
CA FE BA BE 00 00 00 2E 00 1E 0A 00 08 00 11 0A ................
00 03 00 12 07 00 13 0A 00 03 00 14 08 00 15 0A ................
00 03 00 16 07 00 17 07 00 18 01 00 06 3C 69 6E .............
69 74 3E 01 00 03 28 29 56 01 00 04 43 6F 64 65 it>...()V...Code
01 00 0F 4C 69 6E 65 4E 75 6D 62 65 72 54 61 62 ...LineNumberTab
6C 65 01 00 0D 63 68 65 63 6B 50 61 73 73 77 6F le...checkPasswo
72 64 01 00 15 28 4C 6A 61 76 61 2F 6C 61 6E 67 rd...(Ljava/lang
2F 53 74 72 69 6E 67 3B 29 5A 01 00 0A 53 6F 75 /String;)Z...Sou
72 63 65 46 69 6C 65 01 00 14 50 61 73 73 77 6F rceFile...Passwo
72 64 43 68 65 63 6B 65 72 2E 6A 61 76 61 0C 00 rdChecker.java..
09 00 0A 0C 00 19 00 1A 01 00 10 6A 61 76 61 2F ...........java/
6C 61 6E 67 2F 53 74 72 69 6E 67 0C 00 09 00 1B lang/String.....
01 00 08 71 63 76 77 7C 75 79 6C 0C 00 1C 00 1D ...qcvw|uyl.....
01 00 0F 50 61 73 73 77 6F 72 64 43 68 65 63 6B ...PasswordCheck
65 72 01 00 10 6A 61 76 61 2F 6C 61 6E 67 2F 4F er...java/lang/O
62 6A 65 63 74 01 00 08 67 65 74 42 79 74 65 73 bject...getBytes
01 00 04 28 29 5B 42 01 00 05 28 5B 42 29 56 01 ...()[B...([B)V.
00 06 65 71 75 61 6C 73 01 00 15 28 4C 6A 61 76 .
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