策略模式

Folgerjun · web-flow · commit 5e364013286b · 2018-03-12T10:50:13.000+08:00
策略模式
diff --git a/java-des/src/com/java/design/strategy/CalculateStrategy.java b/java-des/src/com/java/design/strategy/CalculateStrategy.java
@@ -0,0 +1,13 @@
+package com.java.design.strategy;
+
+/**
+ * 计算接口
+ * 
+ * @author Administrator
+ *
+ */
+public interface CalculateStrategy {
+
+	void calculatePrice(Integer km);
+
+}
diff --git a/java-des/src/com/java/design/strategy/Strategy.java b/java-des/src/com/java/design/strategy/Strategy.java
@@ -0,0 +1,43 @@
+package com.java.design.strategy;
+
+/**
+ * 公交计算策略
+ * 
+ * @author Administrator
+ *
+ */
+public class Strategy implements CalculateStrategy {
+
+	private String name;
+
+	public Strategy(String name) {
+		this.name = name;
+	}
+
+	@Override
+	public void calculatePrice(Integer km) {
+
+		Integer priceTot = 0;
+
+		if (name == "公交") {
+			int extraTotal = km - 10;
+			int extraFactor = extraTotal / 5;
+			int fraction = extraTotal % 5;
+			int price = 1 + extraFactor * 1;
+			priceTot = fraction > 0 ? ++price : price;
+		} else if (name == "地铁") {
+			if (km <= 6) {
+				priceTot = 3;
+			} else if (km > 6 && km < 12) {
+				priceTot = 4;
+			} else if (km < 22 && km > 12) {
+				priceTot = 5;
+			} else if (km < 32 && km > 22) {
+				priceTot = 6;
+			} else {
+				priceTot = 7;
+			}
+		}
+		System.out.println(name + "坐" + km + "公里需要" + priceTot + "元 ...");
+	}
+}
diff --git a/java-des/src/com/java/design/strategy/StrategyPattern.java b/java-des/src/com/java/design/strategy/StrategyPattern.java
@@ -0,0 +1,21 @@
+package com.java.design.strategy;
+
+/**
+ * 策略模式 -----> 策略模式属于对象的行为模式。其用意是针对一组算法，将每一个算法封装到具有共同接口的独立的类中，从而使得它们可以相互替换。
+ * 策略模式使得算法可以在不影响到客户端的情况下发生变化
+ * 
+ * @author Administrator
+ *
+ */
+public class StrategyPattern {
+
+	public static void main(String[] args) {
+
+		TranficCalculator tranficCalculator = new TranficCalculator();
+		// 设置计算策略
+		// 计算价格
+		tranficCalculator.calculatePrice(new Strategy("地铁"), 10);
+
+	}
+
+}
diff --git a/java-des/src/com/java/design/strategy/TranficCalculator.java b/java-des/src/com/java/design/strategy/TranficCalculator.java
@@ -0,0 +1,13 @@
+package com.java.design.strategy;
+
+public class TranficCalculator {
+
+	CalculateStrategy calculateStrategy;
+
+	public void calculatePrice(CalculateStrategy calculateStrategy, Integer km) {
+
+		this.calculateStrategy = calculateStrategy;
+		calculateStrategy.calculatePrice(km);
+	}
+
+}
