JAVA值得注意继承简单例子..

class Base{
	int i = 47;
	private int f(){ 
		System.out.println("Base f()");
		System.out.println(this);
		return i ;
	} 
	int g(){ 
		System.out.println("Base g()");  
		System.out.println(this);   // this Derived@...
		return f() ;  
	}
	int k(){
		return i ;
	}
}
class Derived extends Base {
	int i = 27;
	int f(){
		return i ;
	}
}
public class Test{
	public static void main(String[] args){
		Base d = new Derived(); 
		System.out.println(d);  //Derived@..   
		System.out.println(d.k()); // print  47 
		System.out.println(d.g()); // print 47;
	}
}