获取List集合中最大值的方法

public static void main(String args[]) 
     {        //Double[] num = { 45.1,45.2 };
              List dlist=new ArrayList();
              dlist.add(45.1);
              dlist.add(45.2);
              dlist.add(110.22);
              Double max = (Double)dlist.get(0);     
              Double min = (Double)dlist.get(0); 
            for (int i = 0; i < dlist.size(); i++) {          
                      if (min > (Double)dlist.get(i)) min = (Double)dlist.get(i);   
                       if (max < (Double)dlist.get(i)) max = (Double)dlist.get(i);        
               }        
                        System.out.println("max的值为" + max + "min的值为" + min);    
      }