v.java.bak

java课件及例程有一些PPT及一些例程

class A
{
    int x=3;
    public void m()
    {
        System.out.println("the x of A is "+x);
    }
}
class V extends A
{
    double x=20.67;  //也可定义为其它类型，如double x;
    public void m()
    {
        System.out.println("the x of V is "+x);
        System.out.println("the x of superclass is "+super.x);
        super.m();
    }

    public static void main(String[] args)
    {
        V b = new V();
        b.m();    	
    }
}