trjhtr

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();
 

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.