获取List集合中的最大值和最小值

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调用Collections类中的方法

最大值：

public static <T extends Object & Comparable<? super T>> T max(Collection<? extends T> coll) {
  Iterator<? extends T> i = coll.iterator();
  T candidate = i.next();

  while (i.hasNext()) {
    T next = i.next();
    if (next.compareTo(candidate) > 0)
      candidate = next;
  }
  return candidate;
}

最小值：

public static <T extends Object & Comparable<? super T>> T min(Collection<? extends T> coll) {
  Iterator<? extends T> i = coll.iterator();
  T candidate = i.next();

  while (i.hasNext()) {
    T next = i.next();
    if (next.compareTo(candidate) < 0)
      candidate = next;
  }
  return candidate;
}