java.util.Collections.max() Comparator 方法

package com.codingdict;

import java.util.*;

public class CollectionsDemo {
   public static void main(String args[]) {

      // create link list object
      LinkedList<Integer> list = new LinkedList<Integer>();

      // populate the list  
      list.add(-18);  
      list.add(40);  
      list.add(-45);  
      list.add(12);

      // comparing using natural ordering
      System.out.println("Max val: " + Collections.max(list,null));          
   }  
}