public class TestAbstract

{

    public static void main(String[] args)

    {

        System.out.println("Hello World!");

        absDemo.SayHi();

        //new absDemo().SayHello();//TestAbstract.java:7: 错误: absDemo是抽象的; 无法实例化

    }

}

abstract class absDemo

{

    public static void SayHi()

    {

        System.out.println("Hi!");

    }

    public  void SayHello()

    {

        System.out.println("Hello");

    }

}

/*

---------- java ----------

Hello World!

Hi!

Output completed (0 sec consumed) - Normal Termination

*/