@FunctionalInterface public interface BooleanSupplier
boolean-valued results.  This is the
 boolean-producing primitive specialization of Supplier.
 There is no requirement that a new or distinct result be returned each time the supplier is invoked.
This is a functional interface
 whose functional method is getAsBoolean().
Supplier| Modifier and Type | Method and Description | 
|---|---|
| boolean | getAsBoolean()Gets a result. | 
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