The abstract method cannot use final or static modification of non-abstract methods. In the abstract class, you can use Fina
Source: Internet
Author: User
Abstract METHODS in abstract classes cannot be final, but they can be compiled by adding final before non-Abstract METHODS because abstract and final are mutually exclusive. The former is used for inheritance, and the latter is not allowed for inheritance.
Abstract METHODS in abstract classes cannot be static.
Non-abstract methods can be static
The package class integer, String, float, and double are all final classes and cannot be inherited! Integer I = new INTEGER ("6"); If the string is not a number, a running exception will occur (No compilation error will occur), but this rule is not applicable to boolean. When a string is used (case-insensitive), the value of the Boolean object is true, and other strings are false, for example:
Boolean B = new Boolean ("afiwou"); false
Boolean B = new Boolean ("true"); true
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