在抽象类java中调用非抽象方法 [英] calling non abstract method in abstract class java

问题描述

我有3节课。这似乎是基本问题。但我不能通过谷歌搜索找到答案。

I have 3 classes. It seems basic question. But I can'nt find answer by googling.

public abstract class Test {

    void t1()
    {
        System.out.println("super");

    }

}
 public class concret extends Test{

    void t1()
    {
        System.out.println("child");

    }
    void t2()
    {
        System.out.println("child2");

    }

}

public class run {
    public static void main(String[] args) {
        Test t=new concret();

        t.t1();
    }

}

如何调用抽象类t1方法？由于我无法从抽象类创建对象，如何在抽象类中调用t1？
谢谢。

How do I call abstract class t1 method? Since I cant create object from abstract class how do I call t1 in abstract class? Thank you.

推荐答案

要么创建一个不覆盖的具体类方法，或在 覆盖方法的具体类中，您可以调用 super.t1（）。例如：

Either you create a concrete class which doesn't override the method, or within a concrete class which does override the method, you can call super.t1(). For example:

void t1()
{
    super.t1(); // First call the superclass implementation
    System.out.println("child");
}

如果您只有一个覆盖方法的对象实例，你不能从类的外部调用原始方法，因为这会破坏封装...覆盖的目的是替换原始方法的行为。

If you've only got an instance of an object which overrides a method, you cannot call the original method from "outside" the class, because that would break encapsulation... the purpose of overriding is to replace the behaviour of the original method.

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