Which will declare a method that forces a subclass to implement it

 

package com.dengwen5;public abstract class AbstractClass {abstract void say();} 

 

 

 

package com.dengwen5;public class Test extends AbstractClass{//The type Test must implement the inherited abstract//method AbstractClass.say()/* * Which will declare a method that forces a subclass to implement it? A. Public double methoda();B. Static void methoda (double d1) {}C. Public native double methoda();D. Abstract public void methoda();E. Protected void methoda (double d1){} Answer D强迫子类实现耶，当然是abstract啦。 * * */public static void main(String[] args) {// TODO Auto-generated method stub}@Overridevoid say() {// TODO Auto-generated method stub}}