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最新推荐文章于 2025-01-06 18:04:26 发布

leagalhigh

最新推荐文章于 2025-01-06 18:04:26 发布

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分类专栏：算法设计模式

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来自九章算法:

C++的代码:

class Solution {
public:
    static Solution * instance;
    Solution(){}

    static Solution* getInstance();
};
Solution* Solution::getInstance(){
    if (NULL == instance) {
        //Lock();
        if (NULL == instance) {
            instance = new Solution();
        }
        //UnLock();
    }
    return instance;
}
Solution * Solution::instance = NULL;

Java代码:

class Solution {
    public static Solution instance = null;
    
    public static Solution getInstance() {
        if(instance == null){
            instance = new Solution();
        }
        return instance;
        // write your code here
    }
};

python代码:

class Solution:
    instance = None
    @classmethod
    def getInstance(cls):
        if cls.instance is None:
            cls.instance = Solution()
        return cls.instance