无法从文本字段Java获取文本

Question

I have encounter a problem with my if else statement. I can't execute my if else statement. Actually the program should get the text from the text field and then convert to integer and validate whether the item id is found or not.

below is my partial coding:

Integer itmID = new Integer(inputItemID.getText());
  Integer brwID = new Integer(inputBorrowerID.getText());
  Item itm = parent.getItems().get(itmID);
  Borrower brw = parent.getBorrowers().get(brwID);
  if (itm == null) {
      JOptionPane.showMessageDialog(this, "Item ID not found","Error", JOptionPane.ERROR_MESSAGE);
    return;
  }

Answer 1

You are retrieving item like Item itm = parent.getItems().get(itmID); , i assume that getItems() is some kind of collection . You are getting itm = null because your getItems() doesn't contain any item with given itemId.