add bridge DP

Liu Yuning · Liu Yuning · commit dc23a463660a · 2017-05-21T10:07:40.000+08:00
diff --git a/src/designpattern/bridge/Abstraction.java b/src/designpattern/bridge/Abstraction.java
@@ -0,0 +1,58 @@
+package designpattern.bridge;
+
+/**
+ * 
+ * @author liu yuning
+ *
+ */
+public abstract class Abstraction {
+    protected Implementor implementor;// 桥接模式的关键，使得Abstraction聚合Implementor
+    private String name;
+
+    public Abstraction(String name) {
+	this.setName(name);
+    }
+
+    public void setImplementor(Implementor implementor) {
+	this.implementor = implementor;
+    }
+
+    public void operation() {
+	System.out.print("Abstraction-" + this.getName() + ": ");
+	implementor.operation();
+    }
+
+    public String getName() {
+	return name;
+    }
+
+    public void setName(String name) {
+	this.name = name;
+    }
+}
+
+class AbstractionA extends Abstraction {
+
+    public AbstractionA(String name) {
+	super(name);
+    }
+
+    @Override
+    public void operation() {
+	super.operation();
+    }
+
+}
+
+class AbstractionB extends Abstraction {
+
+    public AbstractionB(String name) {
+	super(name);
+    }
+
+    @Override
+    public void operation() {
+	super.operation();
+    }
+
+}
diff --git a/src/designpattern/bridge/BridgeClient.java b/src/designpattern/bridge/BridgeClient.java
@@ -0,0 +1,29 @@
+package designpattern.bridge;
+
+/**
+ * 客户端
+ * 
+ * @author liu yuning
+ *
+ */
+public class BridgeClient {
+    public static void main(String[] args) {
+
+	Abstraction a = new AbstractionA("A");
+	a.setImplementor(new ConcreteImplemtorA());
+	a.operation();
+	a.setImplementor(new ConcreteImplemtorB());
+	a.operation();
+
+	Abstraction b = new AbstractionB("B");
+	b.setImplementor(new ConcreteImplemtorA());
+	b.operation();
+	b.setImplementor(new ConcreteImplemtorB());
+	b.operation();
+
+	// 这样通过使用“组合/聚合复用原则”
+	// 如果继续有AbstractionC ... 或者ConcreteImplemtorC ...
+	// 只需要扩展类即可，不需要修改现有类，符合“开放-封闭”原则
+    }
+
+}
diff --git a/src/designpattern/bridge/Implementor.java b/src/designpattern/bridge/Implementor.java
@@ -0,0 +1,32 @@
+package designpattern.bridge;
+
+/**
+ * 
+ * @author liu yuning
+ *
+ */
+public abstract class Implementor {
+
+    public abstract void operation();
+
+}
+
+class ConcreteImplemtorA extends Implementor {
+
+    @Override
+    public void operation() {
+	System.out.println("ConcreteImplemtorA的方法执行");
+
+    }
+
+}
+
+class ConcreteImplemtorB extends Implementor {
+
+    @Override
+    public void operation() {
+	System.out.println("ConcreteImplemtorB的方法执行");
+
+    }
+
+}
