如何强制在java中覆盖一个方法？
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How to force a method to be overridden in java?
提问by Hari Menon
I have to create a lot of very similar classes which have just one method different between them. So I figured creating abstract class would be a good way to achieve this. But the method I want to override (say, method foo()) has no default behavior. I don't want to keep any default implementation, forcing all extending classes to implement this method. How do I do this?
我必须创建许多非常相似的类，它们之间只有一种不同的方法。所以我认为创建抽象类将是实现这一目标的好方法。但是我想覆盖的方法（比如方法 foo()）没有默认行为。我不想保留任何默认实现，强制所有扩展类实现此方法。我该怎么做呢？
采纳答案by Pablo Santa Cruz
You need an abstractmethod on your base class:
您的基类需要一个抽象方法：
public abstract class BaseClass {
public abstract void foo();
}
This way, you don't specify a default behavior andyou force non-abstract classes inheriting from BaseClassto specify an implementation for foo.
这样，您无需指定默认行为，而是强制继承自的非抽象类BaseClass为foo.
回答by Sean Patrick Floyd
Just make the method abstract.
只需将方法抽象化即可。
This will force all subclasses to implement it, even if it is implemented in a super class of the abstract class.
这将强制所有子类实现它，即使它是在抽象类的超类中实现的。
public abstract void foo();
回答by vitaut
Make this method abstract.
使这个方法abstract。
回答by Buhake Sindi
If you have an abstract class, then make your method (let's say fooabstract as well)
如果您有一个抽象类，那么请创建您的方法（也可以说是抽象类foo）
public abstract void foo();
Then all subclasses will have to override foo.
然后所有子类都必须覆盖foo.
回答by Jens Hoffmann
Just define foo() as an abstract method in the base class:
只需将 foo() 定义为基类中的抽象方法：
public abstract class Bar {
abstract void foo();
}
See The Java? Tutorials (Interfaces and Inheritance)for more information.
看到Java？教程（接口和继承）了解更多信息。
