bytecode.txt

// class version 55.0 (55)
// access flags 0x21
public class Main {

  // compiled from: Main.java

  // access flags 0x1
  public <init>()V
   L0
    LINENUMBER 1 L0
    ALOAD 0
    INVOKESPECIAL java/lang/Object.<init> ()V
    RETURN
   L1
    LOCALVARIABLE this LMain; L0 L1 0
    MAXSTACK = 1
    MAXLOCALS = 1

  // access flags 0x9
  public static main([Ljava/lang/String;)V
   L0
    LINENUMBER 4 L0
    ICONST_3
    NEWARRAY T_INT
    DUP
    ICONST_0
    ICONST_1
    IASTORE
    DUP
    ICONST_1
    ICONST_2
    IASTORE
    DUP
    ICONST_2
    ICONST_3
    IASTORE
    ASTORE 1
   L1
    LINENUMBER 6 L1
    ICONST_0
    ISTORE 2
   L2
    ALOAD 1
    ARRAYLENGTH
    ISTORE 3
   L3
   FRAME APPEND [[I I I]
    ILOAD 2
    ILOAD 3
    IF_ICMPGE L4
   L5
    LINENUMBER 7 L5
    GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
    ALOAD 1
    ILOAD 2
    IALOAD
    INVOKEVIRTUAL java/io/PrintStream.println (I)V
   L6
    LINENUMBER 6 L6
    IINC 2 1
    GOTO L3
   L4
    LINENUMBER 10 L4
   FRAME CHOP 2
    ALOAD 1
    ASTORE 2
    ALOAD 2
    ARRAYLENGTH
    ISTORE 3
    ICONST_0
    ISTORE 4
   L7
   FRAME APPEND [[I I I]
    ILOAD 4
    ILOAD 3
    IF_ICMPGE L8
    ALOAD 2
    ILOAD 4
    IALOAD
    ISTORE 5
   L9
    LINENUMBER 11 L9
    GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
    ILOAD 5
    INVOKEVIRTUAL java/io/PrintStream.println (I)V
   L10
    LINENUMBER 10 L10
    IINC 4 1
    GOTO L7
   L8
    LINENUMBER 13 L8
   FRAME CHOP 3
    RETURN
   L11
    LOCALVARIABLE i I L2 L4 2
    LOCALVARIABLE n I L3 L4 3
    LOCALVARIABLE n I L9 L10 5
    LOCALVARIABLE args [Ljava/lang/String; L0 L11 0
    LOCALVARIABLE arr [I L1 L11 1
    MAXSTACK = 4
    MAXLOCALS = 6
}

Main.java

public class Main {

    public static void main(String[] args) {
        int[] arr = new int[]{1, 2, 3};

        for (int i = 0, n = arr.length; i < n; i++) {
            System.out.println(arr[i]);
        }

        for (int n : arr) {
            System.out.println(n);
        }
    }
}