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NetRexx and java byte arrays problem.

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Jason Monroe Martin
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NetRexx and java byte arrays problem.

Jason Monroe Martin
I do not understand why these two programs do not give the same results
     and each do not give the same results every time.

They both give one general answer all the time and then
     all of a sudden they give a odd result.

Maybe, I am not understanding how to do byte arrays in NetRexx or Java.

In both versions I get [B@e53108 lots of times and then for some reasons
     I get [B@f62373 (Maybe OS or Java  Bug; Using Sun Java on xubuntu 10.10)

In the NetRexx version System.out.println and say always agree.

 From the code, are they not basically the same program?


Java Program and Sample Outputs :

public class Main {


     public void test() {

         byte[] SALT = new byte[20];

         SALT[0]=(byte)(int)41;
         SALT[1]=(byte)(int)61;
         SALT[2]=(byte)(int)73;
         SALT[3]=(byte)(int)66;
         SALT[4]=(byte)(int)65;
         SALT[5]=(byte)(int)20;
         SALT[6]=(byte)(int)44;
         SALT[7]=(byte)(int)66;
         SALT[8]=(byte)(int)65;
         SALT[9]=(byte)(int)72;
         SALT[10]=(byte)(int)66;
         SALT[11]=(byte)(int)65;
         SALT[12]=(byte)(int)20;
         SALT[13]=(byte)(int)44;
         SALT[14]=(byte)(int)61;
         SALT[15]=(byte)(int)72;
         SALT[16]=(byte)(int)74;
         SALT[17]=(byte)(int)69;
         SALT[18]=(byte)(int)65;
         SALT[19]=(byte)(int)73;

         System.out.println(SALT);
         System.out.println(SALT[0]);
         System.out.println(SALT[1]);
         System.out.println(SALT[2]);
         System.out.println(SALT[3]);
         System.out.println(SALT[4]);
         System.out.println(SALT[5]);
         System.out.println(SALT[6]);
         System.out.println(SALT[7]);
         System.out.println(SALT[8]);
         System.out.println(SALT[9]);
         System.out.println(SALT[10]);
         System.out.println(SALT[11]);
         System.out.println(SALT[12]);
         System.out.println(SALT[13]);
         System.out.println(SALT[14]);
         System.out.println(SALT[15]);
         System.out.println(SALT[16]);
         System.out.println(SALT[17]);
         System.out.println(SALT[18]);
         System.out.println(SALT[19]);
     }

     public static void main(String[] args) {
         new Main().test();
     }
}

Couple of sample outputs for Java:

monroe@janitor:~/bugorhelp$ java Main
[B@e53108
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73
monroe@janitor:~/bugorhelp$ java Main
[B@f62373
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73

NetRexx Program and Sample Outputs : (Has extra System.out.println(SALT) statement)

SALT = byte[] byte[20]

SALT[0]=byte 41
SALT[1]=byte 61
SALT[2]=byte 73
SALT[3]=byte 66
SALT[4]=byte 65
SALT[5]=byte 20
SALT[6]=byte 44
SALT[7]=byte 66
SALT[8]=byte 65
SALT[9]=byte 72
SALT[10]=byte 66
SALT[11]=byte 65
SALT[12]=byte 20
SALT[13]=byte 44
SALT[14]=byte 61
SALT[15]=byte 72
SALT[16]=byte 74
SALT[17]=byte 69
SALT[18]=byte 65
SALT[19]=byte 73

System.out.println(SALT)
say SALT
say SALT[0]
say SALT[1]
say SALT[2]
say SALT[3]
say SALT[4]
say SALT[5]
say SALT[6]
say SALT[7]
say SALT[8]
say SALT[9]
say SALT[10]
say SALT[11]
say SALT[12]
say SALT[13]
say SALT[14]
say SALT[15]
say SALT[16]
say SALT[17]
say SALT[18]
say SALT[19]

Couple of sample outputs for NetRexx:


monroe@janitor:~/bugorhelp$ java isalt
[B@e53108
[B@e53108
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73
monroe@janitor:~/bugorhelp$ java isalt
[B@f62373
[B@f62373
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73

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Kermit Kiser
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Re: NetRexx and java byte arrays problem.

Kermit Kiser
Jason -

When you attempt to print an object that does not have a well defined string format, such as an entire array, the toString call is going to fall-back to the basic Object class toString method which generates a string based on the object type and the hashcode for the object. The type signature for a byte array is "[B" and here is what the docs for the Object hashCode method say:

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)

If I understand that correctly, the hex code portion of the output will depend on the memory location of the object which can change between runs.

Hope that helps,

-- Kermit


On 11/10/2011 8:46 AM, Jason Monroe Martin wrote:
I do not understand why these two programs do not give the same results
    and each do not give the same results every time.

They both give one general answer all the time and then
    all of a sudden they give a odd result.

Maybe, I am not understanding how to do byte arrays in NetRexx or Java.

In both versions I get [B@e53108 lots of times and then for some reasons
    I get [B@f62373 (Maybe OS or Java  Bug; Using Sun Java on xubuntu 10.10)

In the NetRexx version System.out.println and say always agree.

From the code, are they not basically the same program?


Java Program and Sample Outputs :

public class Main {


    public void test() {

        byte[] SALT = new byte[20];

        SALT[0]=(byte)(int)41;
        SALT[1]=(byte)(int)61;
        SALT[2]=(byte)(int)73;
        SALT[3]=(byte)(int)66;
        SALT[4]=(byte)(int)65;
        SALT[5]=(byte)(int)20;
        SALT[6]=(byte)(int)44;
        SALT[7]=(byte)(int)66;
        SALT[8]=(byte)(int)65;
        SALT[9]=(byte)(int)72;
        SALT[10]=(byte)(int)66;
        SALT[11]=(byte)(int)65;
        SALT[12]=(byte)(int)20;
        SALT[13]=(byte)(int)44;
        SALT[14]=(byte)(int)61;
        SALT[15]=(byte)(int)72;
        SALT[16]=(byte)(int)74;
        SALT[17]=(byte)(int)69;
        SALT[18]=(byte)(int)65;
        SALT[19]=(byte)(int)73;

        System.out.println(SALT);
        System.out.println(SALT[0]);
        System.out.println(SALT[1]);
        System.out.println(SALT[2]);
        System.out.println(SALT[3]);
        System.out.println(SALT[4]);
        System.out.println(SALT[5]);
        System.out.println(SALT[6]);
        System.out.println(SALT[7]);
        System.out.println(SALT[8]);
        System.out.println(SALT[9]);
        System.out.println(SALT[10]);
        System.out.println(SALT[11]);
        System.out.println(SALT[12]);
        System.out.println(SALT[13]);
        System.out.println(SALT[14]);
        System.out.println(SALT[15]);
        System.out.println(SALT[16]);
        System.out.println(SALT[17]);
        System.out.println(SALT[18]);
        System.out.println(SALT[19]);
    }

    public static void main(String[] args) {
        new Main().test();
    }
}

Couple of sample outputs for Java:

monroe@janitor:~/bugorhelp$ java Main
[B@e53108
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73
monroe@janitor:~/bugorhelp$ java Main
[B@f62373
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73

NetRexx Program and Sample Outputs : (Has extra System.out.println(SALT) statement)

SALT = byte[] byte[20]

SALT[0]=byte 41
SALT[1]=byte 61
SALT[2]=byte 73
SALT[3]=byte 66
SALT[4]=byte 65
SALT[5]=byte 20
SALT[6]=byte 44
SALT[7]=byte 66
SALT[8]=byte 65
SALT[9]=byte 72
SALT[10]=byte 66
SALT[11]=byte 65
SALT[12]=byte 20
SALT[13]=byte 44
SALT[14]=byte 61
SALT[15]=byte 72
SALT[16]=byte 74
SALT[17]=byte 69
SALT[18]=byte 65
SALT[19]=byte 73

System.out.println(SALT)
say SALT
say SALT[0]
say SALT[1]
say SALT[2]
say SALT[3]
say SALT[4]
say SALT[5]
say SALT[6]
say SALT[7]
say SALT[8]
say SALT[9]
say SALT[10]
say SALT[11]
say SALT[12]
say SALT[13]
say SALT[14]
say SALT[15]
say SALT[16]
say SALT[17]
say SALT[18]
say SALT[19]

Couple of sample outputs for NetRexx:


monroe@janitor:~/bugorhelp$ java isalt
[B@e53108
[B@e53108
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73
monroe@janitor:~/bugorhelp$ java isalt
[B@f62373
[B@f62373
41
61
73
66
65
20
44
66
65
72
66
65
20
44
61
72
74
69
65
73

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Jason Monroe Martin
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Re: NetRexx and java byte arrays problem.

Jason Monroe Martin
Thanks, I did not understand that it happens that way. I was worried there was a bug I would have trouble isolating.



On 11/10/2011 04:46 PM, Kermit Kiser wrote:
Jason -

When you attempt to print an object that does not have a well defined string format, such as an entire array, the toString call is going to fall-back to the basic Object class toString method which generates a string based on the object type and the hashcode for the object. The type signature for a byte array is "[B" and here is what the docs for the Object hashCode method say:

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)

If I understand that correctly, the hex code portion of the output will depend on the memory location of the object which can change between runs.

Hope that helps,

-- Kermit




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