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E - Element (在集合中使用因为集合中存放的是元素)
T - TypeJava
K - Key
V - Value
N - Number数值类型
? - 表示不确定的java类型无限制通配符类型
SUV - 2nd3rd4th types
Object - 是所有类的根类任何类的对象都可以设置给该Object引用变量使用的时候可能需要类型强制转换但是用使用了泛型TE等这些标识符后在实际用之前类型就已经确定了不需要再进行类型强制转换
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