面向过程的扇入及扇出:
扇入:是指直接调用该模块的上级模块的个数。即:called by个数 (在McCabe 里度量名称为Fan in)
扇出:该模块直接调用的下级模块的个数。即:calls to 个数(在McCabe 里度量名称为Fan out)
面向对象的扇入及扇出:
扇入:派生类的数量:即一个子类继承的父类个数。通俗的讲即有多个个父类产生了此子类。(在McCabe 里度量名称为Fan in)
扇出:由一个类衍生出类的数量:即一个父类产生的子类个数。(在McCabe 里度量名称为NOC)
实例代码:
父类:People.java
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 public class People { 2 private String name; 3 private int age; 4 5 public People(String myName,int myAge){ 6 this.name = myName; 7 this.age = myAge; 8 } 9 10 public void eat(){ 11 System.out.println("I am eating"); 12 } 13 14 public void sleep(){ 15 System.out.println("I am sleep"); 16 } 17 18 public void doWork(){ 19 this.eat(); 20 this.sleep(); 21 System.out.println("I am goto work"); 22 } 23 24 }
子类1:Students.java
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 public class Students extends People{ 2 private String mySchool; 3 4 public Students(String myName, int myAge, String mySchool) { 5 super(myName, myAge); 6 // TODO Auto-generated constructor stub 7 this.mySchool = mySchool; 8 } 9 10 public void goSchool(){ 11 this.doWork(); 12 System.out.println("I am goto school"); 13 } 14 }
子类2:Worker.java
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 public class Worker extends People{ 2 private String address; 3 4 public Worker(String myName, int myAge,String address) { 5 super(myName, myAge); 6 // TODO Auto-generated constructor stub 7 this.address = address; 8 } 9 10 public void doJob(){ 11 this.doWork(); 12 System.out.println("I am goto job"); 13 } 14 }
主类:Famly.java
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
public class Famly { public static void main(String[] args) { // TODO Auto-generated method stub Students stu = new Students("xx",15,"qinghua"); Worker wor = new Worker("yy",35,"tonghuashun"); stu.goSchool(); wor.doWork(); } }
使用McCabe分析的类调用关系图:
People父类产生了子类Students 及Worker,故People类的扇出NOC为2,Students及Worker类的扇入Fan in为1。
McCabe度量信息截图如下:
使用McCabe分析模块调用关系图如下:
doWork方法调用了eat方法及sleep方法,故doWork方法的扇出为2,因doWork方法也调用了类方法system.out.println故:doWork的扇出为3;
同理eat方法及sleep方法的扇入为1,扇出为1。
使用McCabe分析如下:
针对eat模块扇入扇出分析如下:
针对doWork模块扇入扇出分析如下: