The Galaxy J7 (2017) is the high-end among the trio and sports a 5.5-inch Full HD display with 1080 x 1920 pixels of resolution, USB Type-C port, 3GB of RAM, and IP54 rated. It comes with a 3600mAh battery. It comes with 13MP rear and front cameras.
The next in line is the Galaxy J5 (2017). It sports a 5.2-inch HD Super AMOLED display and comes powered by a 1.6GHz Exynos 7870 octa-core processor. The other specs include 16GB onboard storage, 13-megapixel rear and front camera with LED flash, 4G VoLTE support and 3000mAh battery.
The J3 comes with 2GB RAM, 13 megapixel rear camera, 5 megapixel front camera, and 2400mAh battery.
The J5 will be launched in June while J7 in July. The J3 will be launched in August. These are the European launch dates, but the device should eventually enter the Indian markets too. The J5 is priced roughly around Rs 20,000 (EUR 279) and the J7 at approx Rs 24,500 (EUR 339).