Java多态

package day20161008;

class BaseClass {
	
	public int book = 6;
	
	public void base() {
		System.out.println("father base");
	}
	
	public void test() {
		System.out.println("father test");
	}
}

public class TestsubClass extends BaseClass{

	public String  book = "book";
	
	public void base() {
		System.out.println("son base");
	}
	
	public void sub() {
		System.out.println("son sub");
	}
	
	public static void main(String[] args ){
		
		BaseClass baseClass = new BaseClass();
		System.out.println(baseClass.book);
		baseClass.base();
		baseClass.test();
		
		TestsubClass testsubClass = new TestsubClass();
		System.out.println(testsubClass.book);
		testsubClass.base();
		testsubClass.test();
		testsubClass.sub();
		
        BaseClass ploymophicBc = new TestsubClass();  
        System.out.println(ploymophicBc.book);  
        ploymophicBc.base();  
        ploymophicBc.test(); 

	}
	
}

/*6
father base
father test
book
son base
father test
son sub
6
son base
father test*/

 

来源：http://cakin24.iteye.com/blog/2327956