Java ceil() 方法

public class Test {

   public static void main(String args[]) {
      double d = -100.675;
      float f = -90;    

      System.out.println(Math.ceil(d));
      System.out.println(Math.ceil(f));

      System.out.println(Math.floor(d));
      System.out.println(Math.floor(f));
   }
}