Question

I am trying to implement array of Horizontal panels in GWT as follows:

HorizontalPanel[] hp = new HorizontalPanel[5];
VerticalPanel vp = new VerticalPanel();

for(i=0;i<5;i++) {
      hp[i].add(new Label("hello"));
      vp.add(hp[i]);
}

but it gives NullPointerException in 1st line of loop .

Where am i wrong ?
How to implement this in GWT ?

Answer 1

Initializing an array doesn’t initialize the elements of the array. To go this route you need to do this:

hp[i] = new HorizontalPanel();