静态导入Math类方法。

import static java.lang.Math.*;
//from n o w j a v a . c o m - 时代Java

public class Main 

{

   public static void main(String[] args) 

   {

      System.out.printf("sqrt(900.0) = %.1f%n", sqrt(900.0));

      System.out.printf("ceil(-9.8) = %.1f%n", ceil(-9.8));

      System.out.printf("E = %f%n", E);

      System.out.printf("PI = %f%n", PI);

   } 

}