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public class Platypus {
String name;
Platypus(String input) {
   name = input;
   }
Platypus() {
   this("John/Mary Doe");
   }
public static void main(String args[]) {
   Platypus p1 = new Platypus("digger");
      Platypus p2 = new Platypus();
    }
}
    ÔÚÉÏÃæµÄ´úÂëÖУ¬ÓÐ2¸ö²»Í¬²ÎÊýÁбíµÄ¹¹ÔìÆ÷¡£µÚÒ»¸ö¹¹ÔìÆ÷£¬¸øÀàµÄ³ÉÔ±name¸³Öµ£¬µÚ¶þ¸ö¹¹ÔìÆ÷£¬µ÷ÓõÚÒ»¸ö¹¹ÔìÆ÷£¬¸ø³ÉÔ±±äÁ¿nameÒ»¸ö³õʼֵ "John/Mary Doe".
×¢Ò⣺¾¡¹Ü¿ÉÒÔÓÃthisµ÷ÓÃÒ»¸ö¹¹ÔìÆ÷£¬µ«È´²»Äܵ÷ÓÃÁ½¸ö¡£´ËÍ⣬±ØÐ뽫¹¹ÔìÆ÷µ÷ÓÃÖÃÓÚ×îÆðʼλÖ㬷ñÔò±àÒë»á³ö´í¡£
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class Mammal1{
     void getBirthInfo() {
        System.out.println("born alive.");
   }
}
class Platypus2 extends Mammal {
    void getBirthInfo() {
       System.out.println("hatch from eggs");
       System.out.print("a mammal normally is ");
        super.getBirthInfo();
   }
}
public class TestMammal{ 
   public static void main(String[] args){
      Platypus2 pl = new Platypus2();
   }
}
 
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