add ARC content
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@ -65,4 +65,9 @@ Person类有一个构造函数,此构造函数为实例的name属性赋值并
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reference3 = reference1
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现在这个Person类实例已经有三个强引用了。
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<<<<<<< HEAD
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=======
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(未完待续)
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>>>>>>> add ARC content
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