Named Guice bindings

InjectionTest.java

import com.google.common.base.MoreObjects;
import com.google.inject.Binder;
import com.google.inject.ConfigurationException;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import io.airlift.bootstrap.Bootstrap;
import io.airlift.configuration.AbstractConfigurationAwareModule;

import static java.util.Objects.requireNonNull;

public class InjectionTest
{
    public static void main(String[] args)
    {
        Injector injector = new Bootstrap(new MultipleInstancesModule())
                .doNotInitializeLogging()
                .initialize();

        System.out.println(injector.getInstance(Key.get(String.class, Names.named("firstInstance"))));

        try {
            System.out.println(injector.getInstance(String.class)); // expected to fail
        }
        catch (ConfigurationException e) {
            System.out.println("Could not get unnamed String.class");
        }

        System.out.println(injector.getInstance(Key.get(String.class, Names.named("secondInstance"))));

        System.out.println(injector.getInstance(Acceptor.class));
    }

    private static class MultipleInstancesModule
            extends AbstractConfigurationAwareModule
    {
        @Override
        protected void setup(Binder binder)
        {
            binder.bind(Key.get(String.class, Names.named("firstInstance")))
                    .toInstance("First instance value");

            binder.bind(Key.get(String.class, Names.named("secondInstance")))
                    .toInstance("Second instance value");

            binder.bind(Acceptor.class);
        }
    }

    private static class Acceptor
    {
        private final String value;

        @Inject
        public Acceptor(@Named("firstInstance") String value)
        {
            this.value = requireNonNull(value, "value is null");
        }

        @Override
        public String toString()
        {
            return MoreObjects.toStringHelper(this)
                    .add("value", value)
                    .toString();
        }
    }
}