Java Final Keyword
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Keyword final can be used in three different ways:
1. final variable
2. final method
3. final class
1. final variable 基本上就是 constant,一旦被赋值,就不能被变更;如果在class里declare a final variable, 那么在此class生成出的object就必须对这个 final variable赋值。
2. final method 是method can't be over overridden.
3. final class is a class can't be inherited.
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