上转型对象2.java

一些经典的java程序适合初学者.rar

//上转型对象2
abstract class P
{
	public abstract void f(int x);
	public abstract void g(int x,int y);
	public abstract void h(double x);
}
class S1 extends P
{
	public void f(int x)
	{
		System.out.printf("我是S1的f,%d\n",x);
	}
	public void g(int x,int y)
	{
		System.out.printf("我市S1的g,%d,%d\n",x,y);
	}
	public void h(double x)
	{
		System.out.printf("我是S1的h,%f\n",x);
	}
}
class S2 extends P
{
	public void f(int x)
	{
		System.out.printf("我是S2的f,%d\n",x);
	}
	public void g(int x,int y)
	{
		System.out.printf("我市S2的g,%d,%d\n",x,y);
	}
	public void h(double x)
	{
		System.out.printf("我是S2的h,%f\n",x);
	}
}
class S3 extends P
{
	public void f(int x)
	{
		System.out.printf("我是S3的f,%d\n",x);
	}
	public void g(int x,int y)
	{
		System.out.printf("我是S3的g,%d,%d\n",x,y);
	}
	public void h(double x)
	{
		System.out.printf("我是S3的h,%f\n",x);
	}
}
public class Main
{
	public static void main(String[] args)
 {  int x=10,y=20;
 double z=30;
 	P p;
 	p=new S1();
 	p.f(x);
 	p.g(x,y);
 	p.h(z);
 	p=new S2();
 	p.f(x);
 	p.g(x,y);
 	p.h(z);
 	p=new S3();
 	p.f(x);
 	p.g(x,y);
 	p.h(z);
 }
}