java多态

class Base{ 
     private String name = "base"; 
  
     Base(){ 
         tellName(); 
         printName(name); 
     } 
     public void tellName(){ 
         System.out.println("tell "+ name); 
     } 
     public void printName(String name){ 
         System.out.println("print "+ name); 
     } 
} 
class Drived extends Base{ 
     private String name = "Drived"; 
     Drived(){ 
         tellName(); 
         printName(name); 
     } 
     public void tellName(){ 
         System.out.println("tell "+ name); 
     } 
     public void printName(String name){ 
         System.out.println("print "+ name); 
     } 
} 
public class TestObject { 
     public static void main(String args[]){ 
         new Drived(); 
  
     } 
} 
结果为： 
tell null 
print base 
tell Drived 
print Drived