add Strategy Pattern

22.StrategyPattern/2.Code/Context.h

@@ -0,0 +1,44 @@
+#ifndef __CONTEXT_H__
+#define __CONTEXT_H__
+
+#include "Strategy.h"
+#include <stdio.h>
+
+// ÉÏÏÂÎÄÀà
+class Context
+{
+public:
+	Context(){
+		arr = NULL;
+		N = 0;
+	}
+	Context(int iArr[], int iN){
+		this->arr = iArr;
+		this->N = iN;
+	}
+	void setSortStrategy(Strategy* iSortStrategy){
+		this->sortStrategy = iSortStrategy;
+	}
+	void sort(){
+		this->sortStrategy->sort(arr, N);
+		printf("Êä³ö£º ");
+		this->print();
+	}
+	void setInput(int iArr[], int iN){
+		this->arr = iArr;
+		this->N = iN;
+	}
+	void print(){
+		for (int i = 0; i < N; i++){
+			printf("%3d ", arr[i]);
+		}
+		printf("\n");
+	}
+
+private:
+	Strategy* sortStrategy;
+	int* arr;
+	int N;
+};
+
+#endif // __CONTEXT_H__

22.StrategyPattern/2.Code/Strategy.h

@@ -0,0 +1,87 @@
+#ifndef __STRATEGY_H__
+#define __STRATEGY_H__
+
+#include <stdio.h>
+
+// 抽象策略类
+class Strategy
+{
+public:
+	Strategy(){}
+	virtual void sort(int arr[], int N) = 0;
+};
+
+// 具体策略：冒泡排序
+class BubbleSort :public Strategy
+{
+public:
+	BubbleSort(){
+		printf("冒泡排序\n");
+	}
+	void sort(int arr[], int N){
+		for (int i = 0; i<N; i++)
+		{
+			for (int j = 0; j<N - i - 1; j++)
+			{
+				if (arr[j]>arr[j + 1]){
+					int tmp = arr[j];
+					arr[j] = arr[j + 1];
+					arr[j + 1] = tmp;
+				}
+			}
+		}
+	}
+};
+
+// 具体策略：选择排序
+class SelectionSort :public Strategy
+{
+public:
+	SelectionSort(){
+		printf("选择排序\n");
+	}
+	void sort(int arr[], int N){
+		int i, j, k;
+		for (i = 0; i<N; i++)
+		{
+			k = i;
+			for (j = i + 1; j<N; j++)
+			{
+				if (arr[j] < arr[k]){
+					k = j;
+				}
+			}
+			int temp = arr[i];
+			arr[i] = arr[k];
+			arr[k] = temp;
+		}
+	}
+};
+
+// 具体策略：插入排序
+class InsertSort :public Strategy
+{
+public:
+	InsertSort(){
+		printf("插入排序\n");
+	}
+	void sort(int arr[], int N){
+		int i, j;
+		for (i = 1; i<N; i++)
+		{
+			for (j = i - 1; j >= 0; j--)
+			{
+				if (arr[i]>arr[j]){
+					break;
+				}
+			}
+			int temp = arr[i];
+			for (int k = i - 1; k > j; k--){
+				arr[k + 1] = arr[k];
+			}
+			arr[j + 1] = temp;
+		}
+	}
+};
+
+#endif

22.StrategyPattern/2.Code/main.cpp

@@ -0,0 +1,28 @@
+#include "Context.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+	Context* ctx = new Context();
+	int arr[] = { 10, 23, -1, 0, 300, 87, 28, 77, -32, 2 };
+	ctx->setInput(arr, sizeof(arr)/sizeof(int));
+	printf("输入：");
+	ctx->print();
+
+	// 冒泡排序
+	ctx->setSortStrategy(new BubbleSort());
+	ctx->sort();
+
+	// 选择排序
+	ctx->setSortStrategy(new SelectionSort());
+	ctx->sort();
+
+	// 插入排序
+	ctx->setSortStrategy(new InsertSort());
+	ctx->sort();
+
+	printf("\n\n");
+	system("pause");
+	return 0;
+}

README.md

@@ -98,3 +98,7 @@ Jungle设计模式系列
 24.设计模式（二十四）——状态模式
 
 博客地址：https://blog.csdn.net/sinat_21107433/article/details/102966121
+
+25.设计模式（二十五）——策略模式
+
+博客地址：https://blog.csdn.net/sinat_21107433/article/details/102984862