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2018-11-02-构造方法的继承.html
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<p>如果子类没有构造方法，则它继承超类无参数的构造方法； 如果子类有构造方法，那么在创建子类的对象时，则将先执行继承下来的超类的构造方法，然后再执行自己的构造方法。 对于超类中包含有参数的构造方法，子类可以通过在自己的构造方法中使用super关键字来引用，而且必须是子类构造方法中的第一条语句。 用super调用超类的构造方法：super([参数列表])</p>
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