设计模式-装饰者模式

一、基本定义

装饰（Decorator）模式又叫做包装模式，其功能是动态地给一个对象添加一些额外的职责。就增加功能来说，装饰模式相比生成子类更为灵活，是继承关系的一个替换方案。装饰模式可以在不创造更多子类的情况下，将对象的功能加以扩展。装饰模式把客户端的调用委派到被装饰类。

二、代码实现

1.创建被修饰的基类(接口)

public interface IComment {
    //定义接口方法
    void print();
}

2.创建被修饰类的实现类

public class comment implements IComment {
    @Override
    public void print() {
        System.out.println("被修饰类的类的实现类。。。");
    }
}

3.创建修饰类的基类(抽象类)

//修饰类基类对象
public abstract class AbstarctComment implements IComment{
    //一定要引入基类对象
    private IComment comment;
    //构造函数
    public AbstarctComment(IComment comment){
        this.comment=comment;
    }
    //复写接口中的方法
    @Override
    public void print() {
        comment.print();
    }
}

image.png

4.写修饰类的子类

public class b1 extends AbstarctComment {

    public b1(IComment comment) {
        super(comment);
    }

    @Override
    public void print() {
        //调用父类的方法,其实是为了调用被修饰类基类的实现类方法
        super.print();
        //调用自己的处理的方法
        this.myPrint();
    }
    void myPrint(){
        System.out.println("修饰类b1的操作...");
    }
}

说明

这里子类为什么要用super(comment)调用父类构造?
因为如果子类没有显示调用父类构造器,则会自动调用父类默认构造器,如果父类没有默认的无参构造器,则子类需要显示调用父类构造函数,并且super()语句必须写在构造函数中第一条，否则编译无法通过。

5.编写测试类

public class test{
    public static void main(String[] args){
        //创建被修饰类对象
        IComment out=new comment();
        //创建修饰类对象
        b1 b=new b1(out);
        b.print();
    }
}

6.运行结果

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er\.m2\repository\org\jetbrains\kotlin\kotlin-stdlib\1.3.11\kotlin-stdlib-1.3.11.jar;C:\Users\User\.m2\repository\org\jetbrains\kotlin\kotlin-stdlib-common\1.3.11\kotlin-stdlib-common-1.3.11.jar;C:\Users\User\.m2\repository\org\jetbrains\annotations\13.0\annotations-13.0.jar;C:\Users\User\.m2\repository\org\jetbrains\kotlin\kotlin-test\1.3.11\kotlin-test-1.3.11.jar;C:\Users\User\.m2\repository\org\jetbrains\kotlin\kotlin-test-common\1.3.11\kotlin-test-common-1.3.11.jar;C:\Users\User\.m2\repository\org\jetbrains\kotlin\kotlin-reflect\1.3.11\kotlin-reflect-1.3.11.jar;C:\Users\User\.m2\repository\org\sonarsource\scanner\maven\sonar-maven-plugin\3.4.0.905\sonar-maven-plugin-3.4.0.905.jar;C:\Users\User\.m2\repository\org\sonatype\plexus\plexus-sec-dispatcher\1.4\plexus-sec-dispatcher-1.4.jar;C:\Users\User\.m2\repository\org\sonatype\plexus\plexus-cipher\1.4\plexus-cipher-1.4.jar;C:\Users\User\.m2\repository\org\codehaus\plexus\plexus-utils\3.0.22\plexus-utils-3.0.22.jar;C:\Users\User\.m2\repository\org\sonarsource\scanner\api\sonar-scanner-api\2.10.0.1189\sonar-scanner-api-2.10.0.1189.jar;C:\Users\User\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\User\.m2\repository\commons-net\commons-net\3.3\commons-net-3.3.jar;C:\Users\User\.m2\repository\com\qcloud\cos_api\5.5.1\cos_api-5.5.1.jar;C:\Users\User\.m2\repository\org\apache\httpcomponents\httpclient\4.5.7\httpclient-4.5.7.jar;C:\Users\User\.m2\repository\org\apache\httpcomponents\httpcore\4.4.11\httpcore-4.4.11.jar;C:\Users\User\.m2\repository\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;C:\Users\User\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\User\.m2\repository\org\bouncycastle\bcprov-jdk15on\1.59\bcprov-jdk15on-1.59.jar;C:\Users\User\.m2\repository\commons-fileupload\commons-fileupload\1.3.1\commons-fileupload-1.3.1.jar;C:\Users\User\.m2\repository\commons-io\commons-io\2.2\commons-io-2.2.jar;C:\Users\User\.m2\repository\com\alibaba\fastjson\1.2.28\fastjson-1.2.28.jar" test.test
被修饰类的类的实现类。。。
修饰类b1的操作...
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=1536M; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=1536m; support was removed in 8.0

Process finished with exit code 0