Thinking in java ： polymorphism

mynameislikaiqiang

于 2015-12-28 00:55:07 发布

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分类专栏： java 文章标签： java

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本文探讨了Java中静态方法与类继承的关系，解释了静态方法如何与类而非对象关联，以及在继承体系中静态方法的表现。此外，还介绍了方法覆盖的原则及构造函数调用的顺序。

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static methods are associated with the class , not with individual objects
public class Base{
public static void say(){
System.out.println(“Base say”);
}
}
}

public class Devide extends Base{
    public static void say(){
        System.out.println("Devide say");
        }
    public static void main(String []args){
        Devide devide = new Base();
        devide.say();
        // output: "Base say"
        }
}

Only non-private methods may be overridden
Orders of constructor calls, base-Class constructor > member initialization > self-Class constructor
key words: Upcast, late-binding, polymorphism, implements, inheritance, abstract