Assign first element in multidimensional array to one dimensional array

Question

I am trying to add the first element of each array in the two-dimensional array folderArray into a one dimensional array called tempArray as can be seen in the code shown below. However I am getting a null pointer exception from the tempArray. How can I fix this?

    int listLength = folderArray.length;
    String tempArray[] = null;
    for(int x = 0; x<listLength;x++){
        tempArray[x] = folderArray[x][0];
    }

@ZouZou I cant use the tempArray inside the for loop without initializing it to null or else i get an error — user2399782
– user2399782, Commented Mar 31, 2014 at 11:08
But what do you think initializing it to null does? See also stackoverflow.com/questions/218384/… — Alexis C.
– Alexis C., Commented Mar 31, 2014 at 11:16

Aleks G · Accepted Answer · 2014-03-31 11:08:11Z

3

You have to initialise your tempArray before you can assign anything to its elements:

String tempArray[] = new String[listLength];

is a good start (instead of String tempArray[] = null;)

answered Mar 31, 2014 at 11:08

Aleks G

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Rakesh KR · Accepted Answer · 2014-03-31 11:06:38Z

1

Because you are assigning tempArray[] as null

Change it as,
String tempArray[] = new String[listLength];

answered Mar 31, 2014 at 11:06

Rakesh KR

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