Question

I am building an array based off comparing two other arrays. But when I initalize my third array I have to set the length. But that is making my array have null objects in some instances. Is there away I can drop the empty/null postions in the array. See my code so far below:

  private String[]  tags     = new String[] { "Mike", "Bob", "Tom", "Greg" };
  private boolean[] selected = new boolean[tags.length];
  public String[] selected_tags = new String[tags.length];

        for (int i = 0; i < tags.length; i++) {
            if (selected[i] == true){
               selected_tags[i] = tags[i];
            }
        }

I left out the code for the checkboxes that builds the Boolen selected [].

Either way if I only select 2 tags then my selected_tags[] array will be Mike, Bob, Null, Null

I need to get the Null Null out. Thanks in advance!

Answer 1

You can use ArrayList, instead of array.

private String[]  tags     = new String[] { "Mike", "Bob", "Tom", "Greg" };
private boolean[] selected = new boolean[tags.length];
public List<String> selected_tags = new ArrayList<String>();

for (int i = 0; i < tags.length; i++) {
    if (selected[i] == true){
        selected_tags.add(tags[i]);
    } 
}