Question

See this piece of code:

import java.util.*;
public class Temp{
    public static void main(String[] args){
        List<int[]> list1 = new ArrayList<int[]>(); //WORKS!
        List<double[]> list2 = new ArrayList<double[]>(); //WORKS!
        //List<double> list3 = new ArrayList<double>(); //DOES NOT WORK
        //List<int> list4 = new ArrayList<int>(); //DOES NOT WORK
    }
}

AFAIK, java generics does not support primitive types, then how is int[] is compiling? How is autoboxing possible here?

Answer 1

int[] and double[] are object types which extend Object They are not primitives.

You cannot auto box with arrays. Only between primitives and their wrappers.