使用比较器时相同类型的不兼容类型错误

Question

我有一个名为Interval的通用类>

package com.test;

//import statements

public class Interval<T extends Comparable<? super T>> {

    private boolean isStartInclusive;
    private T start;
    private T end;
    private boolean isEndInclusive;

    //Constructors

    //Getter and Setters

    //ToString

    //Hashcode and Equals

    //A public static method that returns comparator for use by other classes
    public static <T extends Comparable<? super T>> Comparator<Interval<T>> getIntervalComparator() {
        return (o1, o2) -> {
            //comparing logic that returns -1 or 1 or 0
        };
    }

}
[每当我使用此Comparator对List<Interval<T>>进行排序时，它都起作用。 

List<Interval<T>> intervalsList1 = getIntervalsList();
intervalsList1.sort(Interval.getIntervalComparator());
但是当我这样做时>
List<Interval<T>> intervalsList1 = getIntervalsList1();
List<Interval<T>> intervalsList2 = getIntervalsList2();

Interval<T> interval1 = intervalsList1.get(i);
Interval<T> interval2 = intervalsList2.get(i);

int compareOneVsTwo = Interval.getIntervalComparator().compare(interval1, interval2); //line 85
我说错了
Error:(85, 76) java: incompatible types: com.test.Interval<T> cannot be converted to com.test.Interval<T>
即使我这样做
Interval<Integer> integerInterval1 = new Interval<>(true, 1, 2, true);
Interval<Integer> integerInterval2 = new Interval<>(true, 4, 5, true);
int compareOneVsTwo = Interval.getIntervalComparator().compare(integerInterval1, integerInterval2); //line 115
我收到此错误：
Error:(115, 72) java: incompatible types: com.test.Interval<java.lang.Integer> cannot be converted to com.test.Interval<T>
我不明白是什么原因导致了此编译错误。 Interval类内部的比较器不是自然排序顺序，而是多个类出于自身目的进行排序时使用的顺序。

我有一个称为Interval package com.test的通用类； //导入语句公共类Interval > {private boolean isStartInclusive;私人...

Answer 1

如果将语句分为两个独立的语句，它将起作用：

Comparator<Interval<T>> compareOneVsTwo = Interval.getIntervalComparator();
compareOneVsTwo.compare(interval1, interval2);

// or in the integer case:
Comparator<Interval<Integer>> compareOneVsTwo = Interval.getIntervalComparator();
compareOneVsTwo.compare(interval1, interval2);