Discuss / Java / 打卡～～
Back

打卡～～

Topic source

保持热爱

#12 Created at ... [Delete] [Delete and Lock User]

obstract 都声明在class Income前面了，Income不是抽象类是什么？你以前白，现在也白

🌙

#13 Created at ... [Delete] [Delete and Lock User]

就是多态，理解多态就行，Income 确实是 抽象类，不过，具体实现，还是看运行期间的类型

🌙

#14 Created at ... [Delete] [Delete and Lock User]

为什么抽象类可以创建数组-CSDN社区

🌙

#15 Created at ... [Delete] [Delete and Lock User]

Java抽象类不能实例化但是可以作为数组元素_追梦的蚂蚁。的博客-CSDN博客

Avenue

#16 Created at ... [Delete] [Delete and Lock User]

因为new 才是实例化，= 只是引用。。。

Lyon

#17 Created at ... [Delete] [Delete and Lock User]

那个人"obtract"都来了,笑死我了

  • 1
  • 2

Reply