5例子6.txt

java电子版源码 java电子版源码

class A
{
     int x,y;
     A()
     {
        x=100;
        y=200;
     }
     A(int x,int y)
     {
        this.x=x;
        this.y=y;
     } 
}
class B extends A
{
     int z;
     B(int x,int y)
     {
        super(x,y);
        z=300; 
     }
     B()
     {
        z=800; 
     }
     public void f()
     {
        System.out.printf("x=%d,y=%d,z=%d\n",x,y,z);
     }
}
class Example
{    
     public static void main(String args[])
     {
         B b1=new B(10,20);
         b1.f(); 
         B b2=new B();
         b2.f();          
     }  
}