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