Java泛型

public class Pair<T, U> {
    private T first;
    private U second;
    public Pair(T first, U second) {
        this.first = first;
        this.second = second;
    }
    public T getFirst() {
        return first;
    }
    public U getSecond() {
        return second;
    }
    public void setFirst(T first) {
        this.first = first;
    }
    public void setSecond(U second) {
        this.second = second;
    }
    public static <T> Pair<T, T> createPair(T first, T second) {
        return new Pair<T, T>(first, second);
    }
    public static <T extends Comparable<T>> T max(T[] array) {
        if (array == null || array.length == 0) {
            return null;
        }
        T max = array[0];
        for (int i = 1; i < array.length; i++) {
            if (array[i].compareTo(max) > 0) {
                max = array[i];
            }
        }
        return max;
    }
}