useconstru.java

来自「java课件及例程有一些PPT及一些例程」· Java 代码 · 共 46 行

class A
{ 

        int x;
        A()
        {
            x=3;
        }
        A(int ax)
        {
            x=ax;
        }
}
class B extends A
{
    double d; 
    B()
    {
        d=0;
    }
    B(double dx)
    {
        
        d=dx;
    } 
    B(int i,double dx)
    {
    	this(dx);
    	//super(i);
    	
    	x=i;
    	//d=dx;
    }
}
public class UseConstru{
    public static void main(String[] args)
    {
        B b1 = new B();
        B b2 = new B(4.7);
        B b3 = new B(6,5.0);
        System.out.println("b1.x= "+b1.x+", b1.d= "+b1.d);
        System.out.println("b2.x= "+b2.x+", b2.d= "+b2.d);
        System.out.println("b3.x= "+b3.x+", b3.d= "+b3.d);
        b2 = b1;
    }	
}//UseConstru.java