As we know Consumer<T> functional interface is used in forEach() so similarly does Java has a use case for Supplier other than the custom ones?
Supplier Functional Interface
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java.util.Optional.orElseGet(Supplier<T> supplier)can be used to provide a default value for an Optional if it is empty.java.util.stream.Stream.generate(Supplier<T> s)can be used to generate a stream of values.