避免可排序元素列表的类型警告

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class SortableList<T> {
    private List<T> elements;

    public SortableList() {
        elements = new ArrayList<>();
    }

    public void addElement(T element) {
        elements.add(element);
    }

    public void sortList(Comparator<T> comparator) {
        Collections.sort(elements, comparator);
    }

    public List<T> getElements() {
        return elements;
    }
}

// 使用示例
public class Main {
    public static void main(String[] args) {
        SortableList<Integer> numbers = new SortableList<>();
        numbers.addElement(5);
        numbers.addElement(2);
        numbers.addElement(7);
        numbers.addElement(1);

        Comparator<Integer> comparator = (a, b) -> a - b;
        numbers.sortList(comparator);

        List<Integer> sortedNumbers = numbers.getElements();
        System.out.println(sortedNumbers);  // 输出: [1, 2, 5, 7]
    }
}