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purechamploo/gist:56acb2f654cde585654993d8c82f325e

Created August 25, 2019 11:20
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自己写了一个app，在造数据进行测试时，发生了一件升起的事情
如下图：
b是由a-i*86399999得到，二者均为long类型
但发现在86399999这个数字后如果不加l，会发生以下事件
b居然比a大！
我是这样发现的：一开始我并没有加L，后面猜测会不会是long和int加减的问题，遂在86399999后加了这个L
注释一下：86399999是一天24小时总共的时间戳，我为了生成每天的数据弄的这个值
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