設計模式課程 設計模式精講 13-2 享元模式coding

1　　　　代碼演練

1.1　　代碼演練1

 

1　　　　代碼演練

1.1　　代碼演練1

需求：

每週由隨機部門經歷作報告；

 

重點關注：

a　　　　該案例是單例模式和享元模式共同使用

b　　　　外部傳入的department是外部狀態，若是是Manager內部定義一個屬性String類型的ManagerTitile，那麼不管外部傳過來的部門如何變化，這個ManagerTitile不會變化，這個ManagerTitile 稱之爲內部狀態

 

 

uml類圖：

 

員工工廠類：

package com.geely.design.pattern.structural.flyweight;

import java.util.HashMap;
import java.util.Map;

/**
 * 建立員工工廠類，
 * 我第一次作的時候就忘了建立這個類
 */
public class EmployFactory {
    //此處應用了 final修飾 引用成員變量，引用對象的內容能夠修改，可是引用地址不能夠修改
    private static final Map<String,Employee> EMPLOYEE_MAP = new HashMap<String,Employee>(); public static Employee getManager(String department){
        String reportContent = "開始演講報告";

        Employee manager = (Manager) EMPLOYEE_MAP.get(department);
        if(manager==null){
            manager = new Manager(department);
            EMPLOYEE_MAP.put(department,manager);
            System.out.println("建立部門經理"+department);
            reportContent = "開始演講報告";
            ((Manager) manager).setReportContent(reportContent);
            System.out.println("演講報告內容爲："+reportContent);
        }else{
 manager = EMPLOYEE_MAP.get(department);
            System.out.println("從池子裏取部門經理"+department);
            reportContent = "開始演講報告";
            ((Manager) manager).setReportContent(reportContent);
            System.out.println("演講報告內容爲："+reportContent);
        }
        return manager;
    }
}

 

員工接口：

package com.geely.design.pattern.structural.flyweight;

/**
 * 員工接口
 *
 * 管理者和員工類實現該接口
 */
public interface Employee  {
    /**
     * 打印報告
     */
    void report(String department);
}

 

員工類：

package com.geely.design.pattern.structural.flyweight;

import java.util.HashMap;
import java.util.Map;

public class Manager implements Employee {

    //該經理所在部門
   private String department;

    //該經理彙報內容
   private String reportContent;


    public void setReportContent(String reportContent) {
        this.reportContent = reportContent;
    }

    //有參構造方法，輸入部門
    public Manager(String department) {
        this.department = department;
    }

    /**
     * 實現report方法
     *
     * 若是池子裏能取到 該部門的對象，就取，不然，直接建立一個 該部門的對象，並放到從池子裏
     */
    @Override
    public void report(String reportContent){
        this.reportContent = reportContent;
    }
}

 

測試類：

package com.geely.design.pattern.structural.flyweight;

public class Test {
    public static void main(String [] args){
        String [] departmentArray = {"業務部","研發部","管理部"};
        String department = "";
        for (int i = 0;i < 10;i++){
            int departmentNum = (int)(Math.random()*departmentArray.length);
            department =departmentArray[departmentNum];
            Employee manager = EmployFactory.getManager(department);
            manager.report(department);
        }
    }
}

 

打印日誌：

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ng\maven\code\repo\org\redisson\redisson\2.9.0\redisson-2.9.0.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\netty\netty-common\4.1.8.Final\netty-common-4.1.8.Final.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\netty\netty-codec\4.1.8.Final\netty-codec-4.1.8.Final.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\netty\netty-buffer\4.1.8.Final\netty-buffer-4.1.8.Final.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\netty\netty-transport\4.1.8.Final\netty-transport-4.1.8.Final.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\netty\netty-resolver\4.1.8.Final\netty-resolver-4.1.8.Final.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\netty\netty-handler\4.1.8.Final\netty-handler-4.1.8.Final.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\javax\cache\cache-api\1.0.0\cache-api-1.0.0.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\projectreactor\reactor-stream\2.0.8.RELEASE\reactor-stream-2.0.8.RELEASE.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\io\projectreactor\reactor-core\2.0.8.RELEASE\reactor-core-2.0.8.RELEASE.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\org\reactivestreams\reactive-streams\1.0.0\reactive-streams-1.0.0.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\com\fasterxml\jackson\dataformat\jackson-dataformat-yaml\2.6.7\jackson-dataformat-yaml-2.6.7.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\org\yaml\snakeyaml\1.15\snakeyaml-1.15.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\com\fasterxml\jackson\core\jackson-core\2.6.7\jackson-core-2.6.7.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\com\fasterxml\jackson\core\jackson-databind\2.6.7\jackson-databind-2.6.7.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\com\fasterxml\jackson\dataformat\jackson-dataformat-avro\2.9.0\jackson-dataformat-avro-2.9.0.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\org\apache\avro\avro\1.8.1\avro-1.8.1.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\com\thoughtworks\paranamer\paranamer\2.7\paranamer-2.7.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\org\xerial\snappy\snappy-java\1.1.1.3\snappy-java-1.1.1.3.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\org\tukaani\xz\1.5\xz-1.5.jar;F:\xiangmu3\Xin\FuQiang\maven\code\repo\com\sun\faces\jsf-api\1.2\jsf-api-1.2.jar" com.geely.design.pattern.structural.flyweight.Test
建立部門經理業務部
演講報告內容爲：開始演講報告
建立部門經理管理部
演講報告內容爲：開始演講報告
從池子裏取部門經理業務部
演講報告內容爲：開始演講報告
從池子裏取部門經理管理部
演講報告內容爲：開始演講報告
從池子裏取部門經理管理部
演講報告內容爲：開始演講報告
建立部門經理研發部
演講報告內容爲：開始演講報告
從池子裏取部門經理研發部
演講報告內容爲：開始演講報告
從池子裏取部門經理管理部
演講報告內容爲：開始演講報告
從池子裏取部門經理研發部
演講報告內容爲：開始演講報告
從池子裏取部門經理管理部
演講報告內容爲：開始演講報告

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