JCombobox 的空文本字段的错误消息

Question

我创建了一个 JComboBox，以便在创建游戏时将玩家添加到列表中。如果文本字段留空，我正在尝试使用 JOptionPane 显示错误消息我使用以下方法执行此操作。

    btnAddPlayer = new JButton("Add Player");
    btnAddPlayer.addActionListener(new ActionListener() { //This is the layout for the list of points that are possible to achieve
        public void actionPerformed(ActionEvent arg0) {     
            if (txtAddPlayer.equals("")){
                        JOptionPane.showMessageDialog(btnAddPlayer, this, "Please Enter Full Details", NumofAnswers);//THIS IS THE METHOD I TRIED 
                } else {
                    comboBox.addItem(txtAddPlayer.getText());
                }
        }
    });
    btnAddPlayer.setBounds(469, 243, 89, 23);
    panel.add(btnAddPlayer);
    txtAddPlayer = new JTextField();

    txtAddPlayer.setBounds(373, 244, 86, 20);
    panel.add(txtAddPlayer);
    txtAddPlayer.setColumns(10);

我不确定为什么这不起作用。请使用我的代码提供答案。此致，

Answer 1

应该是如果 (textField.gettext().equals(""))

JCombobox 的空文本字段的错误消息

Error message for empty textfield for a JCombo box

java

eclipse

jcombobox