import java.util.Arrays; public class Demo3 { public static void main(String[] args) { NonComparable[] a = new NonComparable[3]; a[0] = new NonComparable(true); a[1] = new NonComparable(false); a[2] = new NonComparable(false); System.out.println( Arrays.toString(a) ); SelectionSort.sort(a); // Does not work for non Comparable System.out.println( Arrays.toString(a) ); } }