Sort all even numbers in ascending order and then sort all odd numbers in descending order

Input  : 1, 2, 3, 4, 5, 6, 7, 8
Output : 7, 5, 3, 1, 2, 4, 6, 8

Use comparator and sort. While sorting implement the compare method in such way that multiply -1 with odd numbers and compare, so that odd numbers will come in descending order.

Program

import java.util.*;
public class OddEven {
  public static void main(String[] args){
    Integer[] arr = new Integer[]{1,2,3,4,5,6,7,8};
    List<Integer> al = Arrays.asList(arr);
    Collections.sort(al, new IntComparator());
    System.out.println(al);
  }
}
class IntComparator implements Comparator<Integer> {
  public int compare(Integer o1, Integer o2){
    int t1 = o1, t2 = o2;
    if (t1%2 == 1) {
      t1 = t1 * -1;
    }
    if (t2%2 == 1){
      t2 = t2 * -1;
    }
    return t1 - t2;
  }
}