How can I store StringBuilder value in a String

Question

I would like to get StringBuilder's value in a String variable:

        String strName = detailArrayListFromDB.get(i).getName();
        int dbQty = detailArrayListFromDB.get(i).getQuantity();
        double dbTotal = detailArrayListFromDB.get(i).getTotal();

        Log.d("Name::--", strName);
        Log.d("QTY::--", ""+dbQty);
        Log.d("TOTAL::--", ""+dbTotal);

        StringBuilder strBuilder = new StringBuilder();
        strBuilder.append("Name: "+strName);
        strBuilder.append("Qty:" +dbQty);
        strBuilder.append("Total:" +dbTotal);
        String str = strBuilder.toString();
        Log.d("stringBuilder:", str);

And Log shows:

D/Name::--(20881): Mobile
D/QTY::--(20881): 1
D/TOTAL::--(20881): 20000.0
D/stringBuilder:(20881): Name: MobileQty:1Total:20000.0

D/Name::--(20881): Laptop
D/QTY::--(20881): 1
D/TOTAL::--(20881): 30000.0
D/stringBuilder:(20881): Name: LaptopQty:1Total:30000.0

This is what, I would like to get output:

D/stringBuilder:(20881): Name: Mobile Qty:1 Total:20000.0, Name: Laptop Qty:1 Total:30000.0

I do not get where the problem is - you actually get exactly what you are expecting - you just have to append spaces between data components — Chaosit, Aug 19 '15 at 09:46
don't use the String's concatenation. Call append more times — Blackbelt, Aug 19 '15 at 09:46
If you want to have all Items in one String, use the `strBuilder`again in a loop with no new initialization of it. — MrT, Aug 19 '15 at 09:47
@Oreo, you already have a loop, initialize the StringBuilder outside of it and call `toString()` after the loop. — Chaosit, Aug 19 '15 at 09:49
@Oreo as for downvotes - it's simple: here high-quality and well researched questions are appreciated. This one is neither. — Chaosit, Aug 19 '15 at 09:51
You might have deeper problems, if you're using 6 lines of code to log something out... Firstly, it is not actually faster to use stringbuilder than just string concatenation (see http://stackoverflow.com/questions/1532461/stringbuilder-vs-string-concatenation-in-tostring-in-java) . Secondly, I 'd suggest to look at a logging framework, google slf4j — drrob, Aug 19 '15 at 09:54
I think this is quite simple. You just need to create a StringBuilder and use a loop to append all info you would like to log to your builder. Then you will have the result you want. — Kenny Tai Huynh, Aug 19 '15 at 09:54

score 2 · Accepted Answer · answered Aug 19 '15 at 09:52

To enter a Loop do for example this:

       StringBuilder strBuilder = new StringBuilder();
      for(int i = 0; i < <waht u need>; i++){
            String strName = detailArrayListFromDB.get(i).getName();
            int dbQty = detailArrayListFromDB.get(i).getQuantity();
            double dbTotal = detailArrayListFromDB.get(i).getTotal();

            Log.d("Name::--", strName);
            Log.d("QTY::--", ""+dbQty);
            Log.d("TOTAL::--", ""+dbTotal);


            strBuilder.append(" Name: "+strName);
            strBuilder.append(" Qty:" +dbQty);
            strBuilder.append(" Total:" +dbTotal);
    }
    String str = strBuilder.toString();
    Log.d("stringBuilder:", str);

Except, I'm assuming that to log into a single line, you need to lose the three Log.d calls i.e. Log.d("Name::--") etc. — drrob, Aug 19 '15 at 10:02

score 1 · Answer 2 · answered Aug 19 '15 at 09:51

A StringBuilder is just a way to concat strings together. It doesnt add formatting you have to do that yourself. For example:

strBuilder.append("Name: "+strName + " ");
strBuilder.append("Qty:" +dbQty + " ");
strBuilder.append("Total:" +dbTotal + ", ");

How can I store StringBuilder value in a String

2 Answers2