Flash operation steps using singleton mode

php editor Baicao introduces you to the steps of using singleton mode in Flash. The singleton pattern is a commonly used design pattern that ensures that a class has only one instance. In Flash, using singleton mode can realize global shared resources and improve code reusability and performance. This article will give you a detailed introduction to the steps of using the singleton pattern in Flash to help you better understand and apply this design pattern. Follow our steps to make your Flash development more efficient and convenient!

1. Create a class named Example and save it in a fixed folder.

2. Define a static private variable isopen, the type is Boolean data, and set the initial value to true.

3. Define the constructor of class Example.

4. Use the if statement to make a judgment. If the value of isopen is true, execute the if statement body.

5. Output the test data for executing the if statement body and use the trace method to implement it.

6. Set the value of isopen to false so that the program cannot call the constructor for the second time.

7. Finally, when the constructor is called again, the prompt message [Unable to create instance] is displayed.

8. Create a new flash document and save it in the same folder as the class. This example is [Implementation of Singleton Mode].

9. Create a new code layer, open the action panel, and enter the code to create an Example class instance p1.

10. Run the program. In the window output box, a prompt message is output, indicating that the constructor was successfully called for the first time.

11. Enter the statement and create an instance p2 again.

12. Test program, prompt message that the second instance cannot be created, we successfully implemented the singleton mode.

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