printing content of string array java

Question

I would like to say that I have an 1 day experience with java,therefore if its a bit easy question, sorry about that.

Now, I want to show my piece of code .

I have a string array like :

String [] attributeNames[4];

I've read 4 name each of which are 64 bytes from binary file and store them into this array. (attribute name contain null-ended string max 64 byte) And then I want to print my attributeNames array and their length however, If I write :

for(int i=0;i<attributeNames2.length;i++){
    System.out.println(
        attributeNames2[i] +
        " length: "+attributeNames2[i].length()
    );
}

I got only

pathway             
shortest_path
path_length
avg_neighbour_number

as a result . Length are not printed but If I write

for(int i=0;i<attributeNames2.length;i++){
    System.out.println(
        "length:"+attributeNames2[i].length() + 
        "names:"+ attributeNames2[i]
    );
}

I got

length: 64 pathway
length: 64 shortest_path
length: 64 path_length
length: 64 avg_neighbour_number

I wonder why ? Is there anyone to help me ?

In your first attempt you are creating a 2-Dimensional array.. — TheLostMind
– TheLostMind, Commented Jan 6, 2014 at 12:20
The output does not correspond to the code (which does not compile) - show you real code. — assylias
– assylias, Commented Jan 6, 2014 at 12:20
@TheLostMind does "string[] identifier[x];" compile to "string[][x] identifier"? (Genuine question as I've never written Java) — Jamie Taylor
– Jamie Taylor, Commented Jan 6, 2014 at 12:21
@TheGost Yes, It's just a hint to correct the line. :) As I wont take a step to correct it, because it may be your actual code. — Suresh Atta
– Suresh Atta, Commented Jan 6, 2014 at 12:22
@JamieTaylor - Yes... String [] attributeNames[] is same as String[][] attributeNames.. — TheLostMind
– TheLostMind, Commented Jan 6, 2014 at 12:25

zessx · Accepted Answer · 2014-01-06 12:24:22Z

1

Your loop seems ok, problem probably lies in a way you are creating the array. The right way is

String[] attributeNames2 = new String[4];
attributeNames2[0] = "pathway";
//and so on

Or you can create static array which seems to me sufficient in your case

String[] array = {"pathway", "shortest_path", "and so on"};

edited Jan 6, 2014 at 12:24

zessx

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answered Jan 6, 2014 at 12:23

Petr Mensik

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1 Comment

TheGost Over a year ago

attributeNames[0] will not be just "pathway", instead,since I read 64 bytes. from pathway to 64 bytes there will be whitespaces. I need to remove them I think

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