Convert stream to array

This example will show how to convert a Stream into an Array using Java 8. A streams terminal operation toArray will return an array array containing the elements of this stream. You have the option to provide an overloaded generator function to return an array of a specific type. Other examples that show converting a stream to an array are swap position of stream elements, convert collection to array using java and sort array in java.

Stream to array of strings

@Test
public void stream_of_strings_to_array() {

    String[] stringArray = Stream.of("One", "Two", "Three").toArray(
            String[]::new);

    logger.info(Arrays.toString(stringArray));

    assertTrue(stringArray.length == 3);
}

Stream to array of ints

@Test
public void stream_of_strings_to_ints_array() {

    Integer[] stringArray = Stream.of(1, 2, 3).toArray(Integer[]::new);

    logger.info(Arrays.toString(stringArray));

    assertTrue(stringArray.length == 3);
}

IntStream to array of ints

@Test
public void int_stream_to_array() {

    int[] intArray = IntStream.of(1, 2, 3).toArray();

    logger.info(Arrays.toString(intArray));

    assertTrue(intArray.length == 3);
}

LongStream to array of longs

@Test
public void long_stream_to_array() {

    long[] longArray = LongStream.of(1, 2, 3).toArray();

    logger.info(Arrays.toString(longArray));

    assertTrue(longArray.length == 3);
}

DoubleStream array of doubles

@Test
public void double_stream_to_array() {

    double[] doubleArray = DoubleStream.of(1, 2, 3).toArray();

    logger.info(Arrays.toString(doubleArray));

    assertTrue(doubleArray.length == 3);
}