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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
	}
 
		public abstract class MetricFunction<T extends MetricFunction> {
 
		    public abstract double NDerv(int dervIndex, List<Double> evalPoint);
 
		}
 
		public static class NumericMetricFunction extends MetricFunction {
 
		    public double NDerv(int dervIndex, List<Double> evalPoint) {
 
		        //Do something...
		        double answer = 0.;
 
		        return answer;
		    }
		}
}

Main.java:21: error: NumericMetricFunction is not abstract and does not override abstract method NDerv(int,List) in Ideone.MetricFunction
		public static class NumericMetricFunction extends MetricFunction {
		              ^
Main.java:23: error: name clash: NDerv(int,List<Double>) in NumericMetricFunction and NDerv(int,List<Double>) in Ideone.MetricFunction have the same erasure, yet neither overrides the other
		    public double NDerv(int dervIndex, List<Double> evalPoint) {
		                  ^
2 errors

Standard output is empty