package pair1;

import java.time.LocalDate;

public class PairTester1 {
    public static void main(String[] args) {
        LocalDate[] birthdays = {
                LocalDate.of(1906, 12, 9),
                LocalDate.of(1815, 12, 10),
                LocalDate.of(1910, 6, 22),
        };
        Pair<LocalDate> mm = ArrayAlg.minmax(birthdays);
        System.out.println("min=" + mm.getFirst());
        System.out.println("max=" + mm.getSecond());
    }
}

class ArrayAlg {
    
    public static <T extends Comparable> Pair<T> minmax(T[] a) {
        if(a==null || a.length==0) return null;
        T min = a[0];
        T max = a[0];
        for(int i=1; i<a.length; i++) {
            if(min.compareTo(a[i])>0) min = a[i];
            if(max.compareTo(a[i])<0) max = a[i];
        }
        return new Pair<>(min, max);
    }
}

Java核心技术卷一上的代码，但是就是在Pair<LocalDate> mm = ArrayAlg.minmax(birthdays);出现编译错误