159 lines
3.1 KiB
Java
159 lines
3.1 KiB
Java
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## 桥接（Bridge）
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### Intent
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将抽象与实现分离开来，使它们可以独立变化。
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### Class Diagram
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- Abstraction：定义抽象类的接口
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- Implementor：定义实现类接口
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/2a1f8b0f-1dd7-4409-b177-a381c58066ad.png"/> </div><br>
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### Implementation
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RemoteControl 表示遥控器，指代 Abstraction。
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TV 表示电视，指代 Implementor。
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桥接模式将遥控器和电视分离开来，从而可以独立改变遥控器或者电视的实现。
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```java
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public abstract class TV {
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public abstract void on();
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public abstract void off();
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public abstract void tuneChannel();
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}
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```
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```java
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public class Sony extends TV {
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@Override
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public void on() {
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System.out.println("Sony.on()");
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}
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@Override
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public void off() {
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System.out.println("Sony.off()");
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}
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@Override
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public void tuneChannel() {
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System.out.println("Sony.tuneChannel()");
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}
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}
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```
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```java
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public class RCA extends TV {
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@Override
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public void on() {
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System.out.println("RCA.on()");
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}
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@Override
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public void off() {
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System.out.println("RCA.off()");
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}
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@Override
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public void tuneChannel() {
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System.out.println("RCA.tuneChannel()");
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}
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}
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```
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```java
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public abstract class RemoteControl {
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protected TV tv;
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public RemoteControl(TV tv) {
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this.tv = tv;
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}
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public abstract void on();
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public abstract void off();
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public abstract void tuneChannel();
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}
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```
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```java
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public class ConcreteRemoteControl1 extends RemoteControl {
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public ConcreteRemoteControl1(TV tv) {
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super(tv);
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}
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@Override
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public void on() {
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System.out.println("ConcreteRemoteControl1.on()");
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tv.on();
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}
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@Override
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public void off() {
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System.out.println("ConcreteRemoteControl1.off()");
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tv.off();
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}
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@Override
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public void tuneChannel() {
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System.out.println("ConcreteRemoteControl1.tuneChannel()");
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tv.tuneChannel();
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}
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}
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```
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```java
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public class ConcreteRemoteControl2 extends RemoteControl {
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public ConcreteRemoteControl2(TV tv) {
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super(tv);
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}
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@Override
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public void on() {
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System.out.println("ConcreteRemoteControl2.on()");
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tv.on();
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}
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@Override
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public void off() {
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System.out.println("ConcreteRemoteControl2.off()");
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tv.off();
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}
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@Override
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public void tuneChannel() {
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System.out.println("ConcreteRemoteControl2.tuneChannel()");
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tv.tuneChannel();
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}
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}
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```
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```java
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public class Client {
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public static void main(String[] args) {
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RemoteControl remoteControl1 = new ConcreteRemoteControl1(new RCA());
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remoteControl1.on();
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remoteControl1.off();
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remoteControl1.tuneChannel();
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RemoteControl remoteControl2 = new ConcreteRemoteControl2(new Sony());
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remoteControl2.on();
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remoteControl2.off();
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remoteControl2.tuneChannel();
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}
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}
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```
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### JDK
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- AWT (It provides an abstraction layer which maps onto the native OS the windowing support.)
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- JDBC
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