Dānlìmóshì bǎozhèng yí ge lèi zhǐ yǒu yí ge shílì.
The singleton pattern ensures a class has only one instance.
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One of the 23 GoF (Gang of Four) design patterns. 单例 literally 'single instance' - the pattern forces a class to have exactly one instance globally. Interview-favourite topic in Chinese software engineering.
