class CountingSimple {
    public static void count(int from, int to, int step) {
	int counter = from;
	while (counter < to) {
	    counter = counter + step;
	}
    }
}

Bytecode:

public static void count(int, int, int);
  Code:
   0:   iload_0
   1:   istore_3
   2:   iload_3
   3:   iload_1
   4:   if_icmpge       14
   7:   iload_3
   8:   iload_2
   9:   iadd
   10:  istore_3
   11:  goto    2
   14:  return

  LineNumberTable: 
   line 3: 0
   line 4: 2
   line 5: 7
   line 7: 14

  LocalVariableTable: 
   Start  Length  Slot  Name   Signature
   0      15      0    from       I
   0      15      1    to       I
   0      15      2    step       I
   2      13      3    counter       I
}

class Counting {
    public static void count(int from, int to, int step) {
	int counter = from;
	while (counter < to) {
	    counter = counter + step;
	    System.out.println("counter = " + counter);
	}
    }
}

Bytecode:

public static void count(int, int, int);
  Code:
   0:   iload_0
   1:   istore_3
   2:   iload_3
   3:   iload_1
   4:   if_icmpge       39
   7:   iload_3
   8:   iload_2
   9:   iadd
   10:  istore_3
   11:  getstatic       #2; //Field java/lang/System.out:Ljava/io/PrintStream;
   14:  new     #3; //class java/lang/StringBuilder
   17:  dup
   18:  invokespecial   #4; //Method java/lang/StringBuilder."<init>":()V
   21:  ldc     #5; //String counter = 
   23:  invokevirtual   #6; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   26:  iload_3
   27:  invokevirtual   #7; //Method java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder;
   30:  invokevirtual   #8; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   33:  invokevirtual   #9; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   36:  goto    2
   39:  return

  LineNumberTable: 
   line 3: 0
   line 4: 2
   line 5: 7
   line 6: 11
   line 8: 39

  LocalVariableTable: 
   Start  Length  Slot  Name   Signature
   0      40      0    from       I
   0      40      1    to       I
   0      40      2    step       I
   2      38      3    counter       I
}