Java面向对象程序设计之接口应用(1)

public interface Flyable {
void fly();
}
public interface Talkable {
void talk();
}
public interface Message {
int MAX_SIZE = 4096;
String getMessage();
}

public class Parrot implements Flyable, Talkable {
public void fly() {
System.out.println("Flying like a parrot…");
}
public void talk() {
System.out.println("Hello! I am a parrot!");
}
}
public class TextMessage implements Message {
String message;
public void setMessage(String msg) {
message = msg;
if (message.length() > MAX_SIZE)
message = message.substring(0, MAX_SIZE);
}
public String getMessage() {
return message;
}
}

public interface Const  
ants {
String ROOT = "/root";
int MAX_COUNT = 200;
int MIN_COUNT = 100;
}

public interface RandomColor {
int red = Math.random() * 255;
int green = Math.random() * 255;
int blue = Math.random() * 255;
}

public interface User {
int getAge();
String getName();
String getPassword();
}
public class XMLUser implements User {
// 这里用XML技术实现User接口中的方法
public int getAge() { ... }
public String getName() { ... }
public String getPassword() { ... }
}
public abstract class UserFactory {
public static UserFactory getUserFactory() {
return new XMLUserFactory();
}
public User getUser(String name);
public User getAdmin();
public User createUser(String name, String password, int age);
public void addUser(User user);
public void delUser(User user);
}
public class XMLUserFactory extends UserFactory {
// 这里用XML技术实现的UserFactory的抽象方法
}