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迪米特原则

• 定义：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
• 优点：降低类之间的耦合

public class Course {
   }

public class TeamLeader {
       public void checkNumOfCourses(List
   
     courses) {
           System.out.println("course num is " + courses.size());    }}
   

public class Boss {
       public void countCheck(TeamLeader teamLeader) {
           ArrayList
   
     courses = new ArrayList<>();        for (int i = 0; i < 20; i++) {
               courses.add(new Course());        }        teamLeader.checkNumOfCourses(courses);    }}
   

public class Test {
       public static void main(String[] args) {
           Boss boss = new Boss();        TeamLeader teamLeader = new TeamLeader();        boss.countCheck(teamLeader);    }}

类图：

public class Boss {
       public void countCheck(TeamLeader teamLeader) {
           teamLeader.checkNumOfCourses();    }}

public class TeamLeader {
       public void checkNumOfCourses() {
           ArrayList
   
     courses = new ArrayList<>();        for (int i = 0; i < 20; i++) {
               courses.add(new Course());        }        System.out.println("course num is " + courses.size());    }}
   

类图：

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