@GwtCompatible public interface Supplier<T extends @Nullable Object>A class that can supply objects of a single type; a pre-Java-8 version of
java.util.function.Supplier. Semantically, this could be a factory, generator, builder, closure, or something else entirely. No guarantees are implied by this interface.
Suppliersclass provides common suppliers and related utilities.
See the Guava User Guide article on the use of functional types.
For Java 8+ users
This interface is now a legacy type. Use
java.util.function.Supplier(or the appropriate primitive specialization such as
IntSupplier) instead whenever possible. Otherwise, at least reduce explicit dependencies on this type by using lambda expressions or method references instead of classes, leaving your code easier to migrate in the future.
To use an existing supplier instance (say, named
supplier) in a context where the other type of supplier is expected, use the method reference
supplier::get. A future version of
com.google.common.base.Supplierwill be made to extend
java.util.function.Supplier, making conversion code necessary only in one direction. At that time, this interface will be officially discouraged.
- Harry Heymann