How to check whether given string array returns null?

Question

I want to check the condition whether string array gives value or null.

String function:

String rowData[] = (String[]) ArrayUtils.subarray(DataArray, startIndex,
                                         (startIndex + maxColumnCount));

if(rowData not null)
{

}

Value of data array is coming by:

String DataArray[] = request.getParameter("values").split(",");

What would be in if Condition?

What language is this, C# ? OK: Java - Thank you ;-))

Carsten Massmann
– Carsten Massmann

2013-08-07 08:22:03 +00:00
Commented Aug 7, 2013 at 8:22 — Carsten Massmann
– Carsten Massmann, Commented Aug 7, 2013 at 8:22
Refer this stackoverflow.com/questions/2369967/…

Pandiyan Cool
– Pandiyan Cool

2013-08-07 08:25:13 +00:00
Commented Aug 7, 2013 at 8:25 — Pandiyan Cool
– Pandiyan Cool, Commented Aug 7, 2013 at 8:25

Praveen · Accepted Answer · 2013-08-07 08:20:01Z

1

Check the length/size of the array is zero or not

if(DataArray.length != 0)  //something similar to this

answered Aug 7, 2013 at 8:20

Praveen

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1 Comment

Jitendra Khedar Over a year ago

yes, but i wanted to check it with rowData, its working now. Thnks :)

Joop Eggen · Accepted Answer · 2013-08-07 08:24:06Z

0

The request parameter could not have been given and yield null.

String dataArrayParam = request.getParameter("values");
String[] dataArray = dataArrayParam == null?
    new String[0] : dataArrayParam.split(",");

In general it would be:

if (rowData != null) {

BTW. String[] is a more conventional notation, String a[] comes from C compatibility in the early days of Java.

answered Aug 7, 2013 at 8:24

Joop Eggen

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Comments

Master · Accepted Answer · 2013-08-07 08:44:45Z

0

Simply check

if(DataArray != null)
{
     String rowData[] = (String[]) ArrayUtils.subarray(DataArray, startIndex,
                                         (startIndex + maxColumnCount));

     if(rowData not null)
     {

     }
}

answered Aug 7, 2013 at 8:44

Master

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