阶段1 语言基础+高级_1-3-Java语言高级_02-继承与多态_第7节内部类_18_发红包案例_分析...

傷城~ 2021-11-23 22:44 164阅读 0赞

![87548-20190722000216398-1077956985.png][]  
  
![87548-20190722000216215-258864298.png][]  
接口里面只有一个divide方法，除法的意思  
![87548-20190722000216331-1362148678.png][]  
  
![87548-20190722000216269-1808356291.png][]  
  
这是一个图形界面，此处不做研究。  
![87548-20190722000216207-1531915868.png][]  
  
它是一个抽象的类  
![87548-20190722000216347-224408031.png][]  
  
新建MyRed类实现红包的接口  
![87548-20190722000216464-1184610308.png][]  
Alt+回车。默认选择第一项，  
![87548-20190722000216301-1260408491.png][]  
  
里面只有一个构造方法，没有无参的构造  
![87548-20190722000216431-1677943628.png][]  
所以在子类中一定要调用父类有参数的构造方法  
![87548-20190722000216366-1768092496.png][]  
  
![87548-20190722000216370-1962372355.png][]  
  
![87548-20190722000216446-1486157802.png][]  
  
![87548-20190722000216412-716712141.png][]  
  
![87548-20190722000216503-1443445210.png][]  
  
点击谁谁谁  
![87548-20190722000216475-1779017878.png][]  
  
![87548-20190722000216455-932462527.png][]  
需要自己做的三件事情  
![87548-20190722000216479-125539070.png][]

转载于:https://www.cnblogs.com/wangjunwei/p/11223496.html

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[87548-20190722000216370-1962372355.png]: /images/20211122/fa901111352547bfb06fa534cc457977.png
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[87548-20190722000216412-716712141.png]: /images/20211122/656857939e2b4137836a1beacb886ae4.png
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[87548-20190722000216455-932462527.png]: /images/20211122/8c170b73fb2e468da23749397133b244.png
[87548-20190722000216479-125539070.png]: /images/20211122/ef4a87a437b74bccb627061ce1ac0601.png