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Reports <b>abstract</b> classes which can be converted to interfaces.
A class may be converted to an interface if it has no superclass (other
than Object), has no fields declared that are not <b>static</b>, <b>final</b>, and <b>public</b>, and has no
methods declared that are not <b>public</b> and <b>abstract</b> and no inner classes that are not <b>public</b>.
When using a language level of 8.0 or higher classes containing static and non-static methods will also be reported.
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