ArrayList Limit to hold 10 Values

Question

I am using an ArrayList within my code which gets populated by a EditText field but I am wanting to limit the ArrayList so it can only

Answer 1

ArrayList doesn't have a way of limiting the size; you could extend it to include a limit:

public class FixedSizeLimitedArrayList extends ArrayList<Object> {
  @Override
  public boolean add(Object o) {

      int n=10;
      if (this.size() < n) {
          return super.add(o);
      }
      return false;
  }
}

Other options include:

• Use an array, which is limited.
• Modify the code that uses the list to enforce the limit (e.g. ArrayList Limit to hold 10 Values)
• Find a list implementation that has a limit (some examples listed here): Any way to set max size of a collection?

Answer 2

In your handler method:

if(playerList.size() < 10) {
   // playerList.add
} else {
   // do nothing
}

Edit: Your mistake is here:

if(playerList.size() < 10) {

    Button confirm = (Button) findViewById(R.id.add);
    confirm.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
    EditText playername = (EditText) findViewById(R.id.userinput);
    playerList.add(playername.getText().toString());
    adapter.notifyDataSetChanged();
    playername.setText("");

    }});
} else {
       // do nothing
}

You should check the size inside the onClickListener, not outside:

    Button confirm = (Button) findViewById(R.id.add);
    confirm.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            EditText playername = (EditText) findViewById(R.id.userinput);
            if(playerList.size() < 10) {
               playerList.add(playername.getText().toString());
               adapter.notifyDataSetChanged();
               playername.setText("");
            } else {
                // do nothing
            }
        }
     });

Answer 3

If you don't have control over the function that adds elements to the list, you might want to override the ArrayList add.

public class MySizeLimitedArrayList extends ArrayList<Object> {
  @Override
  public boolean add(Object e) {
      if (this.size() < 10) {
          return super.add(e);
      }
      return false;
  }
}

Answer 4

You modify you setter method like this.

private static ArrayList<String> playerList = new ArrayList<String>();

public boolean addToPlayerList(String input) {
   if (playerList.size() < 10) {
      playerList.add(input);
      return true;   
   } else {
      return false;
   }
}

Or

You can extend ArrayList and create your own customized class.

public class MyArrayList extends ArrayList {
  @Override
  public boolean add(String input) {
      if (this.size() < 10) {
          return super.add(input);
      } else {
          return false;
      }
  }
}