• 概念：指一个对象应该对其他对象保持最少的了解，又叫最少知道原则，尽量降低类与类之间的耦合度

    • 强调： 只和朋友交流，不和陌生人说话

    事例一：

    改造前：

    1. public class project{}
    1. public class TeamLeader{
    2.     public void checkNumberOfProjects(List<Project> projects){
    3.         System.out.println("目前已发布的项目数量: "+projects.size())
    4.     }
    5. }
    1. public class Boss{
    2.     public void commandCheckProject(TeamLeader teamLeader){
    3.         List<Project> projects = new ArrayList<Project>();
    4.         for(int i=0; i<20; i++){
    5.             projects.add(new Project());
    6.         }
    7.         teamLeader.checkNumberOfProjects(projects);
    8.     }
    9. }

    改造后：

    1. public class TeamLeader{
    2.     public void checkNumberOfProjects(){
    3.         List<Project> projects = new ArrayList<Project>();
    4.         for(int i=0; i<20; i++){
    5.             projects.add(new Project());
    6.         }
    7.         System.out.println("目前已发布的项目数量: "+projects.size())
    8.     }
    9. }
    1. public class Boss{
    2.     public void commandCheckProject(TeamLeader teamLeader){
    3.         teamLeader.checkNumberOfProjects();
    4.     }
    5. }