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1.super 关键字可以理解为:父类的
2.可以用来调用的结构:属性、方法、构造器
3.super调用属性、方法:
* 3.1 我们可以在子类的方法或构造器中。通过使用"super.属性"或"super.方法"的方式,显式的调用
父类中声明的属性或方法。但是,通常情况下,我们习惯省略"super."
* 3.2 特殊情况:当子类和父类中定义了同名的属性时,我们要想在子类中调用
父类中声明的属性,则必须显式的使用"super.属性"的方式,表明调用的是父类中声明的属性。
* 3.3 特殊情况:当子类重写了父类中的方法以后,我们想在子类的方法中调用父类中被重写的方法
时,则必须显式的使用"super.方法"的方式,表明调用的是父类中被重写的方法。
4.super调用构造器:
* 4.1 我们可以在子类的构造器中显式的使用**"super(形参列表)"的方式,调用父类中声明的指定的构造器**
* 4.2 "super(形参列表)"的使用,必须声明在子类构造器的首行!
* 4.3 我们在类的构造器中,针对于"this(形参列表)"或"super(形参列表)"只能二选一,不能同时出现
* 4.4 在构造器的首行,没显式的声明"this(形参列表)“或"super(形参列表)”,则默认调用的是父类中空参的构造器:super()
* 4.5 在子类的多个构造器中,至少一个类的构造器中使用了"super(形参列表)"调用父类中的构造器。(因为最多
有n-1个子类构造器用了this(参数))。
* 如果子类构造器中既未显式调用父类或本类的构造器,且父类中又没有无参的构造器,则编译出错。(因为子类构造器会默认调super())
<>this super区别(面试)总结