Animal.java

public class Animal {     String name;      public void setName(String name) {         this.name = name;     }      public String getName() {         return this.name;     } } 

Predator.java

public interface Predator {     public String getName(); } 

Tiger.java

public class Tiger extends Animal implements Predator {  } 

Lion.java

public class Lion extends Animal implements Predator {  } 

ZooKeeper.java

public class ZooKeeper {         public void feed(Predator predator) {         System.out.println("feed "+predator.getName());     }      public static void main(String[] args) {         Tiger tiger = new Tiger();         tiger.setName("tiger");          Lion lion = new Lion();         lion.setName("lion");          ZooKeeper zooKeeper = new ZooKeeper();         zooKeeper.feed(tiger);         zooKeeper.feed(lion);     } }---------------------------소스코드입니다.