sub2.java

接着上次传入一些Java学习中的实验

class Base{
			public Base(){}
			public void println(){System.out.println("The Base of class");}
			}
class Sub1 extends Base{}
class Sub{;}
public class Sub2 extends Sub1{
	public void println(Base b){System.out.println("Base");}
	public void println(Sub1 s){System.out.println("Sub1");}
	public void println(Sub2 s){System.out.println("Sub2");}
	
	public static void main(String args[]){
		Sub2 sub2=new Sub2();
		Base o=new Base();
		Base ps=new Sub2();
		sub2.println(sub2);
		sub2.println(o);
		sub2.println(null);
		if(ps instanceof Base)
		sub2.println(ps);
		else 
		System.out.println("there is no object");
	}
}