content"// Singleton// Intent: ""Ensure a class only has one instance, and provide a global// point of access to it"". // For further information, read ""Design Patterns"", p127, Gamma et al.,// Addison-Wesley, ISBN:0-201-63361-2 相关文章： 2021-10-02 2021-10-18 2022-01-09 2022-03-02 2021-06-23 2022-12-23 2021-07-08 2021-12-15