一、享元模式 1.享元模式定义：为了避免大量拥有相同内容的小类重复创建，而使大家共享一个类的模式。Flyweight享元设计模式实质是运用一个简单工厂方法模式，外加一个单类模式实现细粒度原件的共享。
2.享元模式的UML
3.享元模式示例
class Book{ private String title; private float price; private Author author; public String getTitle(){ return title; } public float getPrice(){ return price; } public Author getAuthor(){ return author; } } //将Author作者类设计为可共享的享元 class Author{ //内部状态 private String name; public String getName(){ return name; } public Author(String name){ this.name = name; } } //享元工厂 public class AuthorFactory{ private static Map<String, Author> authors = new HashMap<String, Author>(); public static Author getAuthor(String name){ Author author = authors.get(name); if(author == null){ author = new Author(name); authors.put(name, author); } return author; } }