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深拷贝和浅拷贝
source link: https://juejin.im/post/5beb93de6fb9a049c30ac9ee
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定义深拷贝、浅拷贝 不要相信其他人说的什么拷贝一层的是浅拷贝，如果拷贝后不影响原来对象内容的就是深拷贝，如果影响就是浅拷贝 深拷贝一般不考虑基本数据类型(除了Object之外的)，因为基本数据类型的简单的赋值就是深拷贝,所以在说深拷贝的时候只说引用数据类型
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