What are the advantages of applying design patterns in Java framework?

Advantages of design pattern application in Java framework

Design pattern is a universal solution widely used in software development, which improves the reliability of the code. Reusability, scalability and maintainability. In the Java framework, the use of design patterns is particularly important because it provides the foundation needed to build robust and scalable applications.

Advantages:

• ##Reusability: The design pattern abstracts common problems into reusable components, avoiding code duplication and redundancy. This improves the maintainability of the application.
• Scalability: Design patterns provide ways to extend an existing code base, making it easier to meet changing needs and avoiding hard-coding and coupling problems.
• Flexibility: The design pattern supports modularity and loose coupling, allowing components to be developed and maintained independently of other components, enhancing the adaptability of the application.
• Code simplicity: Design patterns simplify complex code, making it easier to understand and debug, improving development efficiency.
• Understandability: The design pattern uses clearly named interfaces and classes, making the code intent easier to understand by developers, and promoting the readability and maintainability of the code.

Practical case:

Singleton design pattern is used to ensure that there is only one instance of a class. The following is sample code using the Singleton pattern:

public class Singleton {
    private static Singleton instance;

    private Singleton() {}

    public static Singleton getInstance() {
        if (instance == null) {
            synchronized (Singleton.class) {
                if (instance == null) {
                    instance = new Singleton();
                }
            }
        }
        return instance;
    }
}

Singleton class uses a double-checked locking mechanism to ensure that only one instance is created, thus achieving Singleton mode.

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