为什么有2个init方法

 

 

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1.1         因为init(ServletConfig)如果要对他进行重写以便实现自己的初始化逻辑的话，程序员就不能忘记super.init(config)的调用,那就完蛋了.

1.2         重写init的时候请重写不带参数的init方法