Question

在JComboBox中检查重复项目并删除它们的最佳方法是什么？在我所研究过的任何地方，Java都没有真正回答这个问题。基本上，当我使用观察者模式刷新我的JComboBox时，它会在更新时复制项目。我已经尝试了删除所有项目并将其重新放入的路线，但这会在修改项目信息时导致问题（需要很长时间才能完整解释）。

public void setCustomers()
{

 for (Customer curr : Main.getNewCustomerList().getCustomers())
{

    customerCombo.addItem(curr);

}


}


public void setDetails()
{
Customer selected = (Customer) customerCombo.getSelectedItem();
if(selected != null)
{
forenameText.setText(selected.getForename());
surnameText.setText(selected.getSurname());
costperkgText.setText(String.valueOf(selected.getDeliveryCost()));
line1Text.setText(String.valueOf(selected.getColAddress().getAddressLine1()));
line2Text.setText(String.valueOf(selected.getColAddress().getAddressLine2()));
cityText.setText(String.valueOf(selected.getColAddress().getCity()));
postcodeText.setText(String.valueOf(selected.getColAddress().getPostcode()));

}
else 
{
    ClearText();
}
}

public void ammendDetails()
{
Customer selected = (Customer) customerCombo.getSelectedItem();
if(selected != null)
{
selected.setForename(forenameText.getText());
selected.setSurname(surnameText.getText());
System.out.print(costperkgText.getText());
selected.setDeliveryCost(Double.valueOf(costperkgText.getText()));
Address newAddress = new Address(line1Text.getText(), line2Text.getText(), cityText.getText(), postcodeText.getText());
selected.setColAddress(newAddress);


}
else
{
  ClearText();        
}

}

 public void ClearText()
{
forenameText.setText("");
surnameText.setText("");
costperkgText.setText("");
line1Text.setText("");
line2Text.setText("");
cityText.setText("");
postcodeText.setText("");
}


@Override
public void update()
{
setCustomers();
}

Answer 1

试试这个

  public void setCustomers(){

        customerCombo.removeAllItems();

        for (Customer curr : Main.getNewCustomerList().getCustomers()){

                 customerCombo.addItem(curr);

        }


    }

删除重复项JComboBox

1 个答案: