static的好外是个啥
大家知道static是在数据区存储的，那么在写类的时候都写成静态的不就行了，为啥还要写动态生成类的写法呢，他们都有什么优缺点呢？
------解决思路----------------------
静态是相对动态的
如果都是静态，那就只用共性，没有个性了
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