Java 代码表示 UML 依赖/泛化/实现/关联/聚合/组合关系
Java UML About 1,806 words依赖 - Dependence
/**
* dependence: 依赖关系
* UserService在类中用到了UserDao, User
*/
public class UserService {
private UserDao userDao;
//可以是构造,也可以用Spring注入
public UserService(UserDao userDao) {
this.userDao = userDao;
}
public void saveUser(User user) {
userDao.save(user);
}
}
public class UserDao {
public void save(User user) {
System.out.println("保存用户");
}
}
public class User {
}
泛化 - Generalization
/**
* Generalization: 泛化关系
* 继承就是一种泛化
* UserService继承了BaseService
*/
public class UserService extends BaseService {
}
public abstract class BaseService {
}
实现 - Implementation
/**
* implementation: 实现关系
* UserServiceImpl实现了UserService
*/
public class UserServiceImpl implements UserService {
}
public interface UserService {
}
关联 - Association
单向一对一关联
/**
* association: 关联关系
* 依赖关系的特例
* 单向一对一关联
* User关联IDCard
*/
public class User {
private IDCard idCard;
}
public class IDCard {
}
双向一对一关联
/**
* association: 关联关系
* 依赖关系的特例
* 双向一对一关联
* User关联IDCard,IDCard中同样关联User
*/
public class User {
private IDCard idCard;
}
public class IDCard {
private User user;
}
聚合 - Aggregation
/**
* aggregation: 聚合关系
* 聚合关系是关联关系的特例
* 整体和部分的关系,整体与部分可以分开
* set方法设置Mouse、Keyboard
*/
public class Computer {
private Mouse mouse;
private Keyboard keyboard;
public void setMouse(Mouse mouse) {
this.mouse = mouse;
}
public void setKeyboard(Keyboard keyboard) {
this.keyboard = keyboard;
}
}
public class Mouse {
}
public class Keyboard {
}
组合 - Composition
/**
* composition: 组合关系
* 整体与部分的关系,但是整体与部分不可以分开
* 直接new
*/
public class Computer {
private Mouse mouse = new Mouse();
private Keyboard keyboard = new Keyboard();
}
public class Mouse {
}
public class Keyboard {
}
Views: 5,004 · Posted: 2019-12-16
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