有没有一种方法可以在一个类中对不同类型的列进行分组

public class GroupBy<T> {
    private List<T> list;
    
    public GroupBy(List<T> list) {
        this.list = list;
    }
    
    public <K> Map<K, List<T>> groupBy(Function<T, K> keyExtractor) {
        Map<K, List<T>> result = new HashMap<>();
        
        for (T item : list) {
            K key = keyExtractor.apply(item);
            result.computeIfAbsent(key, k -> new ArrayList<>()).add(item);
        }
        
        return result;
    }
}

List<String> stringList = Arrays.asList("apple", "banana", "orange", "apple");
GroupBy<String> stringGroupBy = new GroupBy<>(stringList);
Map<String, List<String>> stringResult = stringGroupBy.groupBy(Function.identity());
System.out.println(stringResult);

List<Integer> integerList = Arrays.asList(1, 2, 3, 4, 5, 1, 2);
GroupBy<Integer> integerGroupBy = new GroupBy<>(integerList);
Map<Integer, List<Integer>> integerResult = integerGroupBy.groupBy(Function.identity());
System.out.println(integerResult);