Java Math round() 方法

public class Test {

   public static void main(String args[]) {
      double d = 100.675;
      double e = 100.500;
      float f = 100;
      float g = 90f;

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