Java Math rint() 方法

public class Test {

   public static void main(String args[]) {
      double d = 100.675;
      double e = 100.500;
      double f = 100.200;

      System.out.println(Math.rint(d));
      System.out.println(Math.rint(e));
      System.out.println(Math.rint(f));
   }
}