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 } @Override void say() { // TODO Auto-generated method stub } }