Kod bait Java

Kod bait Java ialah set arahan bagi mesin maya Java (JVM). Setiap arahan terdiri daripada opkod yang bersaiz satu bait dan mungkin diikuti oleh kendalian (operand).[1] Tidak kesemua 256 opkod digunapakai, di mana 51 daripadanya disimpan untuk kengunaan masa depan dan 3 lagi disimpan secara kekal untuk digunakan oleh pelaksanaan JVM.

Contoh

Sebagai contoh, kod Java berikut:

outer:
for (int i = 2; i < 1000; i++) {
    for (int j = 2; j < i; j++) {
        if (i % j == 0)
            continue outer;
    }
    System.out.println (i);
}

mungkin diterjemah oleh pengkompil Java kepada kod bait berikut, dengan tanggapan bahawa kod di atas diletakkan di dalam sebuah kaedah:

0:   iconst_2
1:   istore_1
2:   iload_1
3:   sipush  1000
6:   if_icmpge       44
9:   iconst_2
10:  istore_2
11:  iload_2
12:  iload_1
13:  if_icmpge       31
16:  iload_1
17:  iload_2
18:  irem
19:  ifne    25
22:  goto    38
25:  iinc    2, 1
28:  goto    11
31:  getstatic       #84; // Field java/lang/System.out:Ljava/io/PrintStream;
34:  iload_1
35:  invokevirtual   #85; // Method java/io/PrintStream.println:(I)V
38:  iinc    1, 1
41:  goto    2
44:  return

Rujukan

  1. ^ "Bytecode basics" (dalam bahasa Inggeris). JavaWorld. 1996-09-01. Dicapai pada 2019-03-18.

Pautan luar

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