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Update： 接口和抽象类的区别是什么 #36

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Snailclimb merged 1 commit into from
Oct 17, 2018
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Update： 接口和抽象类的区别是什么 #36

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2 changes: 1 addition & 1 deletion Java相关/Java基础知识.md
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Expand Up @@ -225,7 +225,7 @@ String 中的对象是不可变的，也就可以理解为常量，线程安全

## 17. 接口和抽象类的区别是什么

1. 接口的方法默认是 public，所有方法在接口中不能有实现，抽象类可以有非抽象的方法
1. 接口的方法默认是 public，所有方法在接口中不能有实现(Java 8 开始接口方法可以有默认实现），抽象类可以有非抽象的方法
2. 接口中的实例变量默认是 final 类型的，而抽象类中则不一定
3. 一个类可以实现多个接口，但最多只能实现一个抽象类
4. 一个类实现接口的话要实现接口的所有方法，而抽象类不一定
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