Generic comparitive array selection sort

Question

My code works, but my IDE is giving me warnings for unchecked method invocation. I have found useful information about Comparable arrays here. I have found useful information about unchecked method invocation here. Despite this, I just can't figure out how to please my IDE. My intention is to have the method selectionSort sort an array of either Integers or Doubles using compareTo.

import java.util.Arrays;
class Main{
 public static void main(String[] args){
 Comparable[] data0 = {2, 8, -39, 904, 8, 0};
 Comparable[] data1 = {1.1, -5.68, 4.39, -0.01, 5.59};
 System.out.printf("Unsorted array: %s%n%n", Arrays.toString(data0));
 selectionSort(data0);
 System.out.printf("%nSorted array: %s%n", Arrays.toString(data0));
 System.out.printf("Unsorted array: %s%n%n", Arrays.toString(data1));
 selectionSort(data1);
 System.out.printf("%nSorted array: %s%n", Arrays.toString(data1));
 }
 private static <T extends Comparable<T>> void selectionSort(T[] data){
 for(int i = 0; i < data.length - 1; ++i){
 int smallest = i;
 for(int index = i + 1; index < data.length; ++index){
 if (data[smallest].compareTo(data[index]) > 0){
 smallest = index;
 }
 }
 swap(data, i, smallest);
 printPass(data, i + 1, smallest);
 }
 }
 private static <T> void swap(T[] data, int first, int second){
 T temporary = data[first];
 data[first] = data[second];
 data[second] = temporary;
 }
 private static <T> void printPass(T[] data, int pass, int index){
 System.out.printf("after pass %2d: ", pass);
 for(int i = 0; i < index; ++i){
 System.out.printf("%s ", data[i]);
 }
 System.out.printf("%s* ", data[index]);
 for(int i = index + 1; i < data.length; ++i){
 System.out.printf("%s ", data[i]);
 }
 System.out.printf("%n ");
 for (int j = 0; j < pass; j++){
 System.out.printf("-- ");
 }
 System.out.println();
 }
}

Answer 1

When I put this into IntelliJ with my default settings I already get a warning on the Comparable[] data0 declaration.

Raw use of parameterized class

Changing the array declarations to these:

Integer[] data0 = {2, 8, -39, 904, 8, 0};
Double[] data1 = {1.1, -5.68, 4.39, -0.01, 5.59};

solved both warnings.