Test Byte Code

Java Source:

public class Test {
    public static void main(String[] args)
    {
        int x; // declare x
        int y=4; // declare and assign y
        y++; // change y
        String s; // declare s
        //
        x=28;
        s="Hello world!";
    }
}


Byte Code:

$ javap -c -l Test.class
Compiled from "Test.java"
public class Test {
  public Test();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return
    LineNumberTable:
      line 1: 0
    LocalVariableTable:
      Start  Length  Slot  Name   Signature
          0       5     0  this   LTest;

  public static void main(java.lang.String[]);
    Code:
       0: iconst_4
       1: istore_2
       2: iinc          2, 1
       5: bipush        28
       7: istore_1
       8: ldc           #2                  // String Hello world!
      10: astore_3
      11: return
    LineNumberTable:
      line 5: 0
      line 6: 2
      line 9: 5
      line 10: 8
      line 11: 11
    LocalVariableTable:
      Start  Length  Slot  Name   Signature
          0      12     0  args   [Ljava/lang/String;
          8       4     1     x   I
          2      10     2     y   I
         11       1     3     s   Ljava/lang/String;
}