图形用户界面

Question

假设我们有一个 class 存储学生对象列表。还有另一个 class 使用图形用户界面要求用户创建学生对象。

我试过这样做

public class Database {

    private List<Student> students;

    public Database {
        students = new ArrayList<Student>();
    }


    public void addStudent() {
        StudentDialog dialog = new StudentDialog();
        dialog.setVisible(true)
        students.add(dialog.getStudent());
    }

}

public class StudentDialog extends JDialog {

    private JTextField field;

    public StudentDialog(Frame owner) {
        super(owner);
        field = new JTextField();
    }

    public Student getStudent {
        return new Student(field.getText());
    }

}

public class Student {

    private String name;

    public Student(String name){
        this.name = name;
    }
}

但是，这不起作用，因为用户需要时间来输入学生。达到我的目标最惯用的方法是什么？明确地说，我希望能够使用 addStudent 方法随意添加学生。

Answer 1

When the addStudent method is called, it finishes before the user enters any data in the text field

要使对话框停止当前代码的执行直到关闭，您需要将对话框设置为模态。将 setModal(true) 添加到对话框构造函数

public class StudentDialog extends JDialog {

    private JTextField field;

    public StudentDialog(Frame owner) {
        super(owner);
        setModal(true);
        field = new JTextField();
        // I assume you're actually adding this text field to the dialog
    }

    public Student getStudent {
        return new Student(field.getText());
    }

}

您可以只使用 JOptionPane 而不是

有关详细信息，请参阅 How to Make Dialogs

图形用户界面

Graphical User Interfaces

java

swing

jdialog

idioms