问题
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Try to explain Singleton to us？ Is it thread safe？ If no, how to makeit thread safe？
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Try to explain Ioc？
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Try to explain Ioc？
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Try to explain Singleton to us？ Is it thread safe？ If no, how to makeit thread safe？
-
Try to explain Singleton to us？ Is it thread safe？ If no, how to makeit thread safe？
-
Try to explain Ioc？
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