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The dialog box class object in java.net is divided into two types: schema-free and schema-free. What is the difference? Ask the prawn for advice ~

2024-09-10 09:28
According to the book, a dialog box with a model only allows the program to respond to events inside the dialog box, while a dialog box without a model allows the program to respond to events inside and outside the dialog box. How do you understand this sentence?
2024-09-10 11:56

The dialog objects in Java can be divided into two types: one with a model and one without a model. Modal dialog objects need to follow certain design patterns, such as radio boxes, check boxes, text boxes, etc. This class provides some methods for the user to choose, such as selecting text, canceling selection, etc. This class usually has the following characteristics: 1. Clear division of responsibilities: Each member, variable, and method in the class has a clear role and a clear object responsible for achieving different functions in the class. 2. Clear interface: This class provides a set of public methods for other classes to implement. 3. It has good expansibility: this class can add new functions as needed, just need to modify the code of this class. The object of the mode-less dialog box class did not follow the design pattern. It simply implemented the function of a dialog box class without considering the needs of other users. This class usually has the following characteristics: 1. No division of responsibilities: The members, variables, and methods of the class have no clear role and no clear object is responsible for implementing the different functions of the class. 2. No interface: There are no public methods in the class that require other classes to implement the class themselves. 3. Difficult to extend: Since the class does not follow the design pattern, adding new functions requires modifying the class code instead of just modifying the method. The object with the dialog box class can better meet the requirements of software development, and has better expansibility and survivability. On the other hand, the object of the modeled dialog box class was more suitable for simple dialog boxes or did not need to consider the needs of other users.

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