标签：职位 nbsp .repo ide main repo manage 情况 interface
一个项目中有Employee类型，该类型是个大类型，下分为Engineer类型和Manager类型。比方一个人开始是Engineer类型，后来升职了，变成了Manager的角色，这种情况，应该如何建模更好一些。
变继承关系为组成关系，方便扩展。
定义一个Role的接口：
public interface Role { void doWork(); }
定义Employee类型：
public class Employee { private final String name; private final int salary; private Role role; public Employee(String name, int salary, Role role) { this.name = name; this.salary = salary; this.role = role; } public String getName() { return name; } public int getSalary() { return salary; } public Role getRole() { return role; } public void setRole(Role role) { this.role = role; } @Override public String toString() { return "Employee{" + "name=‘" + name + ‘\‘‘ + ", salary=" + salary + ", role=" + role + ‘}‘; } public void doWork(){ this.role.doWork(); } }
定义Engineer类型：
public class Engineer implements Role { @Override public void doWork() { System.out.println("Doing Engineer work."); } @Override public String toString() { return "Engineer"; } }
定义Manager类型：
import java.util.ArrayList; import java.util.List; public class Manager implements Role { private List<Employee> reporters; public Manager(List<Employee> reporters) { this.reporters = new ArrayList<>(reporters); } @Override public void doWork() { System.out.println("Dispatching work."); Employee employee = selectReporter(); employee.doWork(); } private Employee selectReporter() { return reporters.get(0); } @Override public String toString() { return "Manager"; } }
最后进行测试，将“陈驰”的角色由Engineer变成Manager ：
import java.util.Arrays; public class Test { public static void main(String[] args) { Employee employee1 = new Employee("陈驰", 20000, new Engineer()); Employee employee2 = new Employee("魏印福", 20000, new Engineer()); System.out.println(employee1); System.out.println(employee2); System.out.println("Employee1:"); employee1.doWork(); System.out.println("Employee2:"); employee2.doWork(); System.out.println("职位升迁......"); employee1.setRole(new Manager(Arrays.asList(employee2))); System.out.println(employee1); System.out.println(employee2); System.out.println("Employee1:"); employee1.doWork(); System.out.println("Employee2:"); employee2.doWork(); } }
查看测试结果：
标签：职位 nbsp .repo ide main repo manage 情况 interface
原文地址：https://www.cnblogs.com/DarrenChan/p/10344040.html
