Type parameters for JAVA generics the place to note __java

Rules and restrictions
　　
1. A generic type parameter can only be a class type (including a custom class) and cannot be a simple type.
2. The same generic type can correspond to multiple versions (because the parameter types are indeterminate) and different versions of generic class instances are incompatible.
3, the generic type parameter can have more than one.
4. The parameter types of the generic type can use extends statements, such as <t extends Superclass>. It is customarily called "bounded type".
5. The parameter type of the generic type can also be a wildcard character type. For example class<?> ClassType = Class.forName ("java.lang.String");

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