為什么我的需要實現(xiàn)這么多的方法？？是因為jdk1.8？

package?com.choosecourse;

import?java.util.Comparator;
import?java.util.function.Function;
import?java.util.function.ToDoubleFunction;
import?java.util.function.ToIntFunction;
import?java.util.function.ToLongFunction;

public?class?StuComparator?implements?Comparator<Student>?{

	@Override
	public?int?compare(Student?arg0,?Student?arg1)?{
		//?TODO?Auto-generated?method?stub
		return?0;
	}

	@Override
	public?static?<T,?U?extends?Comparable<??super?U>>?Comparator<T>?comparing(
			Function<??super?T,???extends?U>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T,?U>?Comparator<T>?comparing(
			Function<??super?T,???extends?U>?arg0,?Comparator<??super?U>?arg1)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T>?Comparator<T>?comparingDouble(
			ToDoubleFunction<??super?T>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T>?Comparator<T>?comparingInt(ToIntFunction<??super?T>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T>?Comparator<T>?comparingLong(ToLongFunction<??super?T>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T?extends?Comparable<??super?T>>?Comparator<T>?naturalOrder()?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T>?Comparator<T>?nullsFirst(Comparator<??super?T>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T>?Comparator<T>?nullsLast(Comparator<??super?T>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?static?<T?extends?Comparable<??super?T>>?Comparator<T>?reverseOrder()?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?Comparator<Student>?reversed()?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?Comparator<Student>?thenComparing(Comparator<??super?Student>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?<U?extends?Comparable<??super?U>>?Comparator<Student>?thenComparing(
			Function<??super?Student,???extends?U>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?<U>?Comparator<Student>?thenComparing(
			Function<??super?Student,???extends?U>?arg0,
			Comparator<??super?U>?arg1)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?Comparator<Student>?thenComparingDouble(
			ToDoubleFunction<??super?Student>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?Comparator<Student>?thenComparingInt(
			ToIntFunction<??super?Student>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

	@Override
	public?Comparator<Student>?thenComparingLong(
			ToLongFunction<??super?Student>?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?null;
	}

}