DefaultUtils.java

import java.util.Arrays;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;

/**
 * Utilities for working with default values
 */
public class DefaultUtils {
    /**
     * Given objects that may be null return the first object that isn't null
     * @param objects varargs of objects that may be null. The first object that
     *                isn't null will be returned. The last in the varargs is a
     *                default, if it's null a NullPointerException will be thrown
     * @param <T>
     * @return first non null object
     */
    public static <T> T defaultIfNull(final T... objects){
        Objects.requireNonNull(objects[objects.length -1], "default value cannot be null");
        Stream<T> objectStream = Arrays.asList(objects).stream();
        Optional<Optional<T>> condition = objectStream.map(Optional::ofNullable)
                .filter(Optional::isPresent)
                .findFirst();
        return condition.get().get();
    }
}

DefaultUtilsTest.java

import org.junit.Test;
import static org.junit.Assert.*;

public class DefaultUtilsTest {

    @Test
    public void testDefaultUtils() throws Exception {
        String defaultValue = DefaultUtils.defaultIfNull(null, "second value");
        assertEquals("second value", defaultValue);

        defaultValue = DefaultUtils.defaultIfNull(null, null, null, null, "last value");
        assertEquals("last value", defaultValue);

        defaultValue = DefaultUtils.defaultIfNull("first value", "second value");
        assertEquals("first value", defaultValue);

        int defaultNumberValue = DefaultUtils.defaultIfNull(1, 2, 3, 4, 5, 6);
        assertEquals(1, defaultNumberValue);

        defaultNumberValue = DefaultUtils.defaultIfNull(null, null, null, 4, null, 5);
        assertEquals(4, defaultNumberValue);

    }

    @Test(expected = NullPointerException.class)
    public void testException() {
        int defaultNumber = DefaultUtils.defaultIfNull(1, null);
    }

}