What are the three categories of java design patterns?

Java design patterns are divided into three categories: creational patterns, structural patterns and behavioral patterns. Detailed introduction: 1. Creation mode, which involves the creation of objects, and mainly focuses on how to simplify the creation of objects by encapsulating the creation process of objects; 2. Structural mode, which involves the combination of classes or objects, and focuses on How to enhance the combination ability of classes by simplifying the relationship between classes and objects; 3. Behavioral model, which involves the collaboration of behaviors between algorithms and objects, mainly focusing on how to simplify the design of software by coordinating the behavior of objects, etc. wait.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Java design patterns are divided into three categories: creational patterns, structural patterns and behavioral patterns.

1. Creation-based mode: This mode involves the creation of objects, mainly focusing on how to simplify the creation of objects by encapsulating the creation process of objects. Common creational patterns include singleton pattern, factory pattern, builder pattern, prototype pattern, etc.

2. Structural pattern: This pattern involves the combination of classes or objects. It mainly focuses on how to enhance the combination ability of classes by simplifying the relationship between classes and objects. Common structural patterns include proxy mode, bridge mode, decorator mode, flyweight mode, etc.

3. Behavioral pattern: This pattern involves the collaboration of behaviors between algorithms and objects. It mainly focuses on how to simplify the design of software by coordinating the behavior of objects. Common behavioral patterns include observer pattern, strategy pattern, template method pattern, state pattern, etc.

These design patterns are widely used in software development. They can help developers better understand and design software systems and improve the reusability, flexibility and maintainability of code.

The main difference between structural patterns and behavioral patterns is reflected in their different focuses.

1. Structural pattern mainly focuses on how to organize classes or objects into larger structures according to a certain layout. It deals with the composition of classes and objects and how to enhance the compositional capabilities of classes by simplifying these relationships. GoF (Gang of Four, referring to the four authors of the book "Design Patterns") provides 7 structural patterns such as proxy, adapter, bridge, decoration, appearance, flyweight, and combination.

2. Behavioral patterns mainly focus on how classes or objects cooperate with each other to complete tasks that cannot be completed by a single object alone, and how to allocate responsibilities. It involves the collaboration of behaviors between algorithms and objects and aims to simplify the design of software by coordinating the behavior of objects. GoF provides 11 behavioral patterns such as template methods, strategies, commands, chain of responsibility, status, observers, mediators, iterators, visitors, memos, interpreters, etc.

In general, structural patterns focus on the static relationship structure between objects, while behavioral patterns focus on dynamic behavioral interactions between objects. In actual software design, these two patterns are usually used in combination to achieve a design that is both reasonable and efficient.

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