JDK5新特性之一----静态导入

package staticEx;

   public class TranscendentalConstants {

     public static final double PI = 3.14159;

     public static final double E = 2.71828;

   }

public class IrrationalConstants {

     public static final double SQRT_TWO = 1.414;

     public static final double SQRT_THREE = 1.732;

   }

//在类中导入静态变量和方法

package staticEx;

   import static staticEx.IrrationalConstants.SQRT_TWO;

   import static staticEx.IrrationalConstants.SQRT_THREE;

   import static staticEx.TranscendentalConstants.PI;

   public class ConstantsWithStaticImport {

     public static double sinPiOverFour() {

       return SQRT_TWO / 2;

     }

     public static void main(String[] args) {

       System.out.println("Pi is approximately " + PI);

       System.out.println("The sin of Pi/4 is about " +

         sinPiOverFour());

     }

   }