Question

当点击JOptionPane中的按钮时，我需要一种编写一些代码来处理事件的方法。我实际上正在使用JOptionPane插入用户名和密码，如果单击正确和确定按钮，JOptionPane将消失，父JFrame保持活动状态，如果单击取消按钮，程序将退出。我的示例代码仅显示JOptionpane并单击任何按钮才会关闭它 `JPanel panel = new JPanel（）; panel.setLayout（new GridLayout（4,1））; //创建带文本的标签（用户名） JLabel用户名=新JLabel（“用户名”）;

    //Create a label with text (Password)
    JLabel password = new JLabel("Password");

    //Create text field that will use to enter username
    JTextField textField = new JTextField(12);

    //Create password field that will be use to enter password
    JPasswordField passwordField = new JPasswordField(12);

    //Add label with text (username) into created panel
    panel.add(username);

    //Add text field into created panel
    panel.add(textField);

    //Add label with text (password) into created panel
    panel.add(password);

    //Add password field into created panel
    panel.add(passwordField);

    //Show JOptionPane that will ask user for username and password
    JOptionPane.showConfirmDialog(mainFrame, panel, "Enter username and password", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);`

Answer 1

这些对话框返回int值，该值可解释为以下值之一：

YES_OPTION
NO_OPTION
CANCEL_OPTION
OK_OPTION
CLOSED_OPTION

例如，

final int option = JOptionPane.showConfirmDialog(mainFrame, panel, "Enter username and password", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
if(option == JOptionPane.OK_OPTION){
    // OK was pressed. Now do stuff.
}
else if(option == JOptionPane.CANCEL_OPTION){
    // Cancel was pressed. Now do stuff.
}

Answer 2

Javadoc救援：

返回：

指示用户选择的选项的int

将结果与JOptionPane（OK_OPTION，CANCEL_OPTION，CLOSED_OPTION等中定义的常量进行比较。

如何处理JOptionPane.showConfirmDialog中的选项类型

2 个答案: