asked on

convert array items to string seperated with commas

hi guys

this is my code in my backend class

CodeVO[] oldCodes = ((ConVO)Object).getSysCode();
so oldCodes is an array of ids
= [a,b,c,d,e] (for example)

In ConVO , i have

public class ConVO
{
      public CodeVO[] SysCode            = null;

      public CodeVO[] getSysCode() {
            return SysCode;
      }

      public void setSysCode(CodeVO[] SysCode) {
            this.SysCode = SysCode;
      }

}
Now in ConVO, i want to write a method where i have to return a string with all the ids in array 'SysCode'
seperated by comma

something like

public String returnStringIdsSeperatedWithCommas() {
            if (SysCode != null)
            {
                  convert the SysCode array to a string of ids seperated with comma

             return the string;
//so return something like a,b,c,d,e
            }

      }

any ideas greatly appreciated

thanks
J

CEHJ

You can do something like

StringBuilder sb = new StringBuilder();
for (int i = 0;i < SysCode.length - 1;i++) {
	sb.append(SysCode[i]).append(',');
}
sb.append(SysCode[length - 1]);
return sb.toString();

Open in new window

CEHJ

Sorry that should have been

sb.append(SysCode[SysCode.length - 1]);

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jaggernat

ASKER

ok THX. but why do we need >>sb.append(SysCode[SysCode.length - 1]);

CEHJ

>>ok THX. but why do we need >>sb.append(SysCode[SysCode.length - 1]);

Puts in the last element after the last comma

jaggernat

ASKER

ok,, cant we just do

for (int i = 0;i < SysCode.length;i++) {
sb.append(SysCode[i]).append(',');
}

jaggernat

ASKER

ok ,i got it..

thanks

CEHJ

Anything more?

jaggernat

ASKER

yeah, last thing i guess
this is the code
      public String commaSeperatedStrings()
      {
            StringBuilder sb = null;
            if (Codes != null)
            {
                  for (int i = 0;i < SysCode.length- 1;i++)
                  {
                        sb.append(SysCode[i]).append(',');
                  }
                  sb.append(SysCode[SysCode.length - 1]);
            }
            return sb.toString();
      }

but if (Codes != null) is false, it throws null pointer exception. any ideas?

thanks
J

jaggernat

ASKER

sorry , slight change

public String commaSeperatedStrings()
{
StringBuilder sb = null;
if (SysCode != null)
{
for (int i = 0;i < SysCode.length- 1;i++)
{
sb.append(SysCode[i]).append(',');
}
sb.append(SysCode[SysCode.length - 1]);
}
return sb.toString();
}

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CEHJ

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jaggernat

ASKER

thanks

CEHJ

:-)