桥梁模式（Bridge Pattern）

   桥梁模式的用意是“将抽象化与实现化脱耦，使得二者可以独立地变化”。

示例

1、结构图

 

 

2、java代码

Abstraction抽象类：

package bridge.abstraction;

import bridge.implementor.Implementor;
public abstract class Abstraction {
 protected Implementor imp;
 public void operation(){
  imp.operationImp();
 }
}

 

RefinedAbstraction类：

package bridge.abstraction;

import bridge.implementor.Implementor;
public class RefinedAbstraction extends Abstraction{
 public RefinedAbstraction(Implementor imp){
  this.imp = imp;
 }
 public void operation(){
  System.out.println("================START===================");
  super.operation();
  System.out.println("================STOP===================");
 }
}

 

Implementor抽象类：

package bridge.implementor;

abstract public class Implementor {
 abstract public void operationImp();
}

 

ConcreteImplementor类：

package bridge.implementor;

public class ConcreteImplementor extends Implementor{
 public void operationImp() {
  System.out.println("ConcreteImplementor operate......");
 }
}

 

Client类：

package bridge;

import bridge.abstraction.Abstraction;
import bridge.abstraction.RefinedAbstraction;
import bridge.implementor.ConcreteImplementor;
import bridge.implementor.Implementor;
public class Client {
 public static void main(String args[]){
  Implementor imp = new ConcreteImplementor();
  Abstraction abstraction = new RefinedAbstraction(imp);
  abstraction.operation();
 }
}