TestAbstract

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
*/