桥接模式
介绍
Bridge 模式又叫做桥接模式，是构造型的设计模式之一。Bridge模式基于类的最小设计原则，通过使用封装，聚合以及继承等行为来让不同的类承担不同的责任。它的主要特点是把抽象（abstraction）与行为实现（implementation）分离开来，从而可以保持各部分的独立性以及应对它们的功能扩展。
架构图
角色和职责
Client
- Bridge模式的使用者
Abstraction
- 抽象类接口（接口或抽象类**）**
0 维护对行为实现（Implementor）的引用
Refined Abstraction
- Abstraction子类
Implementor
- 行为实现类接口 (Abstraction接口定义了基于Implementor接口的更高层次的操作)
ConcreteImplementor
- Implementor子类
架构衍进过程：
1.
类关系不好把握。
2.
3.
代码；
java
package com.darian.pattern_23._15_Bridge.eg3;
public interface Engine {
void installEngine();
}package com.darian.pattern_23._15_Bridge.eg3;
public interface Engine {
void installEngine();
}java
package com.darian.pattern_23._15_Bridge.eg3;
public class Engine2000 implements Engine {
public void installEngine() {
System.out.println("Engine2000...installEngine.......");
}
}package com.darian.pattern_23._15_Bridge.eg3;
public class Engine2000 implements Engine {
public void installEngine() {
System.out.println("Engine2000...installEngine.......");
}
}java
package com.darian.pattern_23._15_Bridge.eg3;
public class Engine2200 implements Engine{
public void installEngine() {
System.out.println("Engine2200...installEngine.......");
}
}package com.darian.pattern_23._15_Bridge.eg3;
public class Engine2200 implements Engine{
public void installEngine() {
System.out.println("Engine2200...installEngine.......");
}
}java
package com.darian.pattern_23._15_Bridge.eg3;
public abstract class Car {
private Engine engine;
public Car(Engine engine) {
this.engine = engine;
}
public Engine getEngine() {
return engine;
}
public void setEngine(Engine engine) {
this.engine = engine;
}
public abstract void installEngine();
}package com.darian.pattern_23._15_Bridge.eg3;
public abstract class Car {
private Engine engine;
public Car(Engine engine) {
this.engine = engine;
}
public Engine getEngine() {
return engine;
}
public void setEngine(Engine engine) {
this.engine = engine;
}
public abstract void installEngine();
}java
package com.darian.pattern_23._15_Bridge.eg3;
public class Bus extends Car{
public Bus(Engine engine) {
super(engine);
}
public void installEngine() {
System.out.print("Bus......installEngine......");
this.getEngine().installEngine();
}
}package com.darian.pattern_23._15_Bridge.eg3;
public class Bus extends Car{
public Bus(Engine engine) {
super(engine);
}
public void installEngine() {
System.out.print("Bus......installEngine......");
this.getEngine().installEngine();
}
}java
package com.darian.pattern_23._15_Bridge.eg3;
public class Jeep extends Car {
public Jeep(Engine engine) {
super(engine);
}
public void installEngine() {
System.out.print("Jeep....installEngine......");
this.getEngine().installEngine();
}
}package com.darian.pattern_23._15_Bridge.eg3;
public class Jeep extends Car {
public Jeep(Engine engine) {
super(engine);
}
public void installEngine() {
System.out.print("Jeep....installEngine......");
this.getEngine().installEngine();
}
}java
package com.darian.pattern_23._15_Bridge.eg3;
public class MainClass {
public static void main(String[] args) {
Engine engine2000 = new Engine2000();
Engine engine2200 = new Engine2200();
Car car1 = new Bus(engine2000);
car1.installEngine();
Car car2 = new Bus(engine2200);
car2.installEngine();
Car jeep1 = new Jeep(engine2000);
jeep1.installEngine();
Car jeep2 = new Jeep(engine2200);
jeep2.installEngine();
}
}package com.darian.pattern_23._15_Bridge.eg3;
public class MainClass {
public static void main(String[] args) {
Engine engine2000 = new Engine2000();
Engine engine2200 = new Engine2200();
Car car1 = new Bus(engine2000);
car1.installEngine();
Car car2 = new Bus(engine2200);
car2.installEngine();
Car jeep1 = new Jeep(engine2000);
jeep1.installEngine();
Car jeep2 = new Jeep(engine2200);
jeep2.installEngine();
}
}c
Bus......installEngine......Engine2000...installEngine.......
Bus......installEngine......Engine2200...installEngine.......
Jeep....installEngine......Engine2000...installEngine.......
Jeep....installEngine......Engine2200...installEngine.......Bus......installEngine......Engine2000...installEngine.......
Bus......installEngine......Engine2200...installEngine.......
Jeep....installEngine......Engine2000...installEngine.......
Jeep....installEngine......Engine2200...installEngine.......例子
- 给人接不同的骨头，
- 手机换不同容量的电池。