Curriculum design patterns Design patterns succinctly 24-2 intermediary model coding

1 Code Walkthrough

1.1 Code Walkthrough 1

 

 

 

 

1 Code Walkthrough

1.1 Code Walkthrough 1

demand:

Cattle course back qq discussion groups Li X after each person to send a message, others can see

 

 

Note :( personal development did not notice the place)

processing regarding a message (e.g., sensitive verification information, etc.), can be placed in the intermediary, user need not encapsulated.

b qq group chat rooms and this process usually mediator (such applications more), the relationship may be more complex.

The spread between c class by themselves, see the user class;

 

 

uml 类图:

 

 

 

Test categories:

package com.geely.design.pattern.behavioral.mediator;

/**
 * Created by geely
 */
public class Test {
    public static void main(String[] args) {
        User geely = new User("Geely");
        User tom= new User("Tom");

        geely.sendMessage(" Hey! Tom! Let's learn Design Pattern");
        tom.sendMessage("OK! Geely");
    }


}

 

 

 

 

qq group messaging classes:

package com.geely.design.pattern.behavioral.mediator;

import java.util.Date;

/**
 * Created by geely
 * / 
Public  class studygroup {
 
   / ** 
     * core method, the user will send a message, sent by the mediator to 
     * /
     public  static  void showMessage (the User User, String Message) {
        System.out.println(new Date().toString() + " [" + user.getName() + "] : " + message);
    }
}

 

 

 

User categories:

package com.geely.design.pattern.behavioral.mediator;

/**
 * Created by geely
 */
public class User {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public User(String name) {
        this.name = name;
    }

    / ** 
      * to pass over his own 
      * /
     public voidsendMessage (the Message String) {
        StudyGroup.showMessage(this, message);
    }
}

 

 

Print log:

Tue Mar 03 05:51:45 CST 2020 [Geely] :  Hey! Tom! Let's learn Design Pattern
Tue Mar 03 05:51:45 CST 2020 [Tom] : OK! Geely

Process finished with exit code 0