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Fail kelas Java ialah sebuah fail dengan sambungan fail .class mengandungi kod bait Java yang boleh dilakukan pada mesin maya Java (JVM).

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ofset bait	saiz	jenis atau nilai	penerangan
0	4 bytes	u1 = 0xCA hex	angka ajaib (CAFEBABE) bagi menentukan fail mengikut format fail kelas
1		u1 = 0xFE hex
2		u1 = 0xBA hex
3		u1 = 0xBE hex
4	2 bait	u2	nombor versi minor bagi format fail kelas yang dipakai
5	2 bait	u2	nombor versi minor bagi format fail kelas yang dipakai
6	2 bait	u2	nombor versi major bagi format fail kelas yang dipakai. Java SE 13 = 57 (0x39 hex), Java SE 12 = 56 (0x38 hex), Java SE 11 = 55 (0x37 hex), Java SE 10 = 54 (0x36 hex),^[1] Java SE 9 = 53 (0x35 hex),^[2] Java SE 8 = 52 (0x34 hex), Java SE 7 = 51 (0x33 hex), Java SE 6.0 = 50 (0x32 hex), Java SE 5.0 = 49 (0x31 hex), JDK 1.4 = 48 (0x30 hex), JDK 1.3 = 47 (0x2F hex), JDK 1.2 = 46 (0x2E hex), JDK 1.1 = 45 (0x2D hex). Maklumat nombor-nombor versi yang lebih awal tercata di nota kaki 1 di The JavaTM Virtual Machine Specification 2nd edition
7	2 bait	u2
8	2 bait	u2	bilangan constant pool, bilangan entri dalam jadual constant pool berikut. This count is at least one greater than the actual number of entries; see following discussion.
9	2 bait	u2
10	cpsize (variable)	table	constant pool table, an array of variable-sized constant pool entries, containing items such as literal numbers, strings, and references to classes or methods. Indexed starting at 1, containing (constant pool count - 1) number of entries in total (see note).
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10+cpsize	2 bytes	u2	access flags, a bitmask
11+cpsize	2 bytes	u2	access flags, a bitmask
12+cpsize	2 bytes	u2	identifies this class, index into the constant pool to a "Class"-type entry
13+cpsize	2 bytes	u2
14+cpsize	2 bytes	u2	identifies super class, index into the constant pool to a "Class"-type entry
15+cpsize	2 bytes	u2
16+cpsize	2 bytes	u2	interface count, number of entries in the following interface table
17+cpsize	2 bytes	u2
18+cpsize	isize (variable)	table	interface table: a variable-length array of constant pool indexes describing the interfaces implemented by this class
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18+cpsize+isize	2 bytes	u2	field count, number of entries in the following field table
19+cpsize+isize	2 bytes	u2	field count, number of entries in the following field table
20+cpsize+isize	fsize (variable)	table	field table, variable length array of fields each element is a field_info structure defined in https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.5
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20+cpsize+isize+fsize	2 bytes	u2	method count, number of entries in the following method table
21+cpsize+isize+fsize	2 bytes	u2
22+cpsize+isize+fsize	msize (variable)	table	method table, variable length array of methods each element is a method_info structure defined in https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.6
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22+cpsize+isize+fsize+msize	2 bytes	u2	attribute count, number of entries in the following attribute table
23+cpsize+isize+fsize+msize	2 bytes	u2
24+cpsize+isize+fsize+msize	asize (variable)	table	attribute table, variable length array of attributes each element is an attribute_info structure defined in https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7
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Rencana ini ialah rencana tunas. Anda boleh membantu Wikipedia dengan mengembangkannya.

Jika anda melihat rencana yang menggunakan templat {{tunas}} ini, gantikanlah dengan templat tunas yang lebih spesifik.

[1] ttp://www.oracle.com/technetwork/java/javase/10-relnote-issues-4108729.html#Remaining

[2] ttps://bugs.openjdk.java.net/browse/JDK-8148785

[1]

[2]

Fail kelas Java

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