1.

2.加法操作类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

//加法操作类
public class AddOperation : Operation
{
//重写父类方法
public override double GetResult()
{
double dReult = 0;
dReult = m_dNumberA + m_dNumberB;
return dReult;
}
}

3.减法操作类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

//减法操作类
public class SubOperation : Operation
{
//重写父类方法
public override double GetResult()
{
double dReult = 0;
dReult = m_dNumberA - m_dNumberB;
return dReult;
}
}

4.乘法操作类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
///

5.公共类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Operation
{
public double m_dNumberA;
public double m_dNumberB;
//虚方法提供子类重写
public virtual double GetResult()
{
double dResult = 0;
return dResult;
}

}

public class OperationFactory
{
public Operation CreateOperate(string str)
{
Operation operation = null;
switch (str)
{
case "+":
operation = new AddOperation ();
break;
case "-":
operation = new SubOperation();
break;
case "*":
operation = new RideOperation();
break;
default:
break;
}
return operation;
}
}

6.使用

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class OperateTest : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
OperationFactory factory = new OperationFactory();
Operation operation = factory.CreateOperate("+");
operation.m_dNumberA = 5;
operation.m_dNumberB = 2;
double addResult = operation.GetResult();
Debug.Log("加:" + addResult);
Operation Suboperation = factory.CreateOperate("-");
Suboperation.m_dNumberA = 10;
Suboperation.m_dNumberB = 2;
double subResult = Suboperation.GetResult();
Debug.Log("减:" + subResult);
Operation Rideoperation = factory.CreateOperate("*");
Rideoperation.m_dNumberA = 2;
Rideoperation.m_dNumberB = 2;
double rideResult = Rideoperation.GetResult();
Debug.Log("乘:" + rideResult);

    //1+(1+2)+(1+2+3)+...+(1+2+3+...+10)之和  
    int i = 1, j = 1, s = 0, s1 =0;  
    while (j<=10)  
    {  
        while (i<=j)  
        {  
            s += i;  
            i++;  
        }  
        s1 += s;  
        j++;  
    }  
    Debug.Log(s1);

}

}

7.打印结果

8.好用的代码块

单例模式  代码如下

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
///

// Update is called once per frame  
void Update()  
{  
    if (Input.GetMouseButtonDown(0))  
    {  
        //向缓存池中拿东西  
        PoolManager.GetInstance().GetObj("Cube");  
    }  
    if (Input.GetMouseButtonDown(1))  
    {  
        PoolManager.GetInstance().GetObj("Sphere");  
    }  
    Debug.Log(PoolManager.GetInstance().pool1Dic.Count);  
}  

//创建字段存储容器  
public Dictionary<string, List<GameObject>> pool1Dic = new Dictionary<string, List<GameObject>>();

private GameObject poolObj;  
//取得游戏物体  
public GameObject GetObj(string name)  
{  
    GameObject obj = null;  
    //ContainsKey判断是否包含指定的“键名”  
    //.count 获得符合条件的个数  
    if (pool1Dic.ContainsKey(name) && pool1Dic\[name\].Count > 0)  
    {  
        //取得List中的第一个  
        obj = pool1Dic\[name\]\[0\];  
        //移除第零个(这样才能允许同时创建多个物体)  
        //这样才是真正的“拿出来”  
        pool1Dic\[name\].RemoveAt(0);  
    }  
    else  
    {  
        //缓存池中没有该物体，我们去目录中加载  
        //外面传一个预设体的路径和名字，我内部就去加载它  
        //Resources类允许你从指定的路径查找或访问资源(api)  
        obj = GameObject.Instantiate(Resources.Load<GameObject>(name));  
        //创建对象后，将对象的名字与池中名字相符  
        obj.name = name;  
    }  
    //让物体显示出来  
    obj.SetActive(true);  
    obj.transform.parent = null;  
    return obj;  
}

//外界返还游戏物体  
public void PushObj(string name, GameObject obj)  
{  
    if (poolObj == null)  
    {  
        poolObj = new GameObject("Pool");

    }  
    //将这个物体设置父亲为空物体  
    obj.transform.parent = poolObj.transform;

    //让物体失活  
    obj.SetActive(false);  
    //里面有记录这个键（有这个抽屉）  
    if (pool1Dic.ContainsKey(name))  
    {  
        pool1Dic\[name\].Add (obj);  
    }  
    //未曾记录这个键（没有这个抽屉）  
    else  
    {  
        pool1Dic.Add(name, new List<GameObject>() { obj });  
    }  
}  

//放回去  
void Push()  
{  
    PoolManager.GetInstance().PushObj(transform.name, this.gameObject);  
}