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
"C:\Program Files\Java\jdk1.8.0_121\bin\java" -server -XX:PermSize=1536M -XX:MaxPermSize=1536m "-javaagent:D:\soft\idea\IntelliJ IDEA 2017.2.2\lib\idea_rt.jar=2916:D:\soft\idea\IntelliJ IDEA 2017.2.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_121\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunmscapi.jar;C:\Program 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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
