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_17_接口作为方法的参数和或返回值 - 走看看

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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_17_接口作为方法的参数和或返回值

接口作为方法的参数和返回值

ArrayList点进去看源码

再点进去看List<E>的源码

我们已经学了多态，就可以使用左父右子

这里的接口又作为参数又作为返回值

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原文地址：https://www.cnblogs.com/wangjunwei/p/11223466.html

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