同时覆盖具有泛型异常和泛型类型的方法

Question

我在覆盖接口中声明的方法时遇到了一些问题，该方法使用泛型参数作为其异常，并使用泛型作为其参数之一。为了说明，我编写了以下代码接口

package test;

import java.lang.IllegalArgumentException;
import java.util.List;

interface Interfaz {

    <ARGUMENT_EXCEPTION extends IllegalArgumentException> String metodoA(String[] params) throws ARGUMENT_EXCEPTION;

    <ARGUMENT_EXCEPTION extends IllegalArgumentException> String metodoB(List<String> params) throws ARGUMENT_EXCEPTION;

    <ARGUMENT_EXCEPTION extends IllegalArgumentException> String metodoC(List<String> params) throws ARGUMENT_EXCEPTION;

}

class Implementadora implements Interfaz {
        //This overrides metodoA correctly
        @Override
    public String metodoA(String[] params) throws IllegalArgumentException {
                throw new IllegalArgumentException("ex");
        }

    //This one won't override metodoB, however
    @Override
    public String metodoB(List<String> params) throws IllegalArgumentException {
                throw new IllegalArgumentException("ex");
        }

    //Ugly workaround (with unchecked cast)
    @Override
    public <ARGUMENT_EXCEPTION extends IllegalArgumentException> String metodoC(List<String> params) throws ARGUMENT_EXCEPTION {
                throw (ARGUMENT_EXCEPTION)new IllegalArgumentException("ex");
        }
}

通过javac运行，我得到

Line: 14
Implementadora is not abstract and does not override abstract method metodoB(java.util.List) in Interfaz

Line: 23
name clash: metodoB(java.util.List) in Implementadora and metodoB(java.util.List) in Interfaz have the same erasure, yet neither overrides the other

Line: 22
method does not override or implement a method from a supertype

请注意，在接口中，metodoA和metodoB之间的唯一区别在于它们的参数。

为什么Implementadora（Implementadora）的metodoB（metodoB）（代码）不重写Interfaz（代码），但重写metodoB（代码）的方式是一样的？

Answer 1

您不能期望字符串在方法A和方法B中返回，请查看您的接口，这里是编译的版本

class Implementadora implements Interfaz {

@Override
public <ARGUMENT_EXCEPTION extends IllegalArgumentException> String metodoA(String[] params)
        throws ARGUMENT_EXCEPTION {
    // TODO Auto-generated method stub
    return null;
}

@Override
public <ARGUMENT_EXCEPTION extends IllegalArgumentException> String metodoB(List<String> params)
        throws ARGUMENT_EXCEPTION {
    // TODO Auto-generated method stub
    return null;
}

@Override
public <ARGUMENT_EXCEPTION extends IllegalArgumentException> String metodoC(List<String> params)
        throws ARGUMENT_EXCEPTION {
    // TODO Auto-generated method stub
    return null;
}
    //This overrides metodoA correctly

}