目录引言1. 获取最近十二个月解释：2. 获取最近十二周解释：3. 获取最近四个季度解释：4. 获取十二个月前的月第一天解释：5. 获取十二周前的周第一天解释：结论引言
I was trying to identify the reason behind constants in Java I have learned that Java allows us to 开发者_运维知识库declare constants by using final keyword.
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