使用 lambda 和自定义 Comparator 类的排序列表不起作用

Question

I am trying to sort List of Objects that by their name using lambda and custom comparator class "VirusSorter" but its doing nothing i dont know why Main code

List<Virus> tmpVir = new ArrayList<>(OuterClass.getSvi_virusi());
        tmpVir.stream()
                .sorted(new VirusSorter())
                .forEach(System.out::println);

Comparator class:

class VirusSorter  implements Comparator<Virus> {

    @Override
    public int compare(Virus o1, Virus o2) {

        if(o1.getNaziv().compareTo(o2.getNaziv().toUpperCase()) == 1)
        {
            return 1;
        }
        else if(o1.getNaziv().compareTo(o2.getNaziv().toUpperCase()) == -1)
        {
            return -1;
        }
        else
            return 0;
    }
}

Answer 1

The compare inputs are o2.getNaziv().toUpperCase() and o1.getNaziv() (without a call to make it upper case), so it's never comparing like with like.

Try something like

public int compare(Virus o1, Virus o2) {
    return o1.getNaziv().compareToIgnoreCase(o2.getNaziv());
}