Question

I wanted to store a value from a string array to another string array. But I get “NullPointerException” error with the code below. “imagesSelected” is a string array stored with values inside. But when i wanted to move it into another string array after substring, I get error. I believed is because of the last line of code. I’m not sure how to make it work.

String[] imageLocation;

        if(imagesSelected.length >0){
        for(int i=0;i<imagesSelected.length;i++){
            int start = imagesSelected[i].indexOf("WB/");
            imageLocation[i] = imagesSelected[i].substring(start + 3);
        }
        }

Answer 1

You need to do something like this:

String[] imageLocation = new String[imagesSelected.length];

Otherwise imageLocation will be null.

By the way, you don’t need the if around your loop. It’s completely redundant, as that will be the same logic that will be used at the start of the loop.