transient is not allowed in interfaces. It only makes sense for instance fields. Fields in an interface are automatically public static and final.
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"strictfp - only for class and methods not for variables"
True
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synchronized methods only
True
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volatile is used to ensure that the changes to a
primitive field, made by one
thread, are always visible to others threads. It is like having synchronized the accessor and mutator methods of the field.
In the case the accesses to a variable occur through several threads, and they are not synchronized; declaring the variable as volatile --as an alternative to synchronizing the accesses-- might mean an advantage in performance.
