Strings

Сравнение объектов: практика
http://info.javarush.ru/javarush_articles/2015/12/02/%D0%A1%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5-%D0%BE%D0%B1%D1%8A%D0%B5%D0%BA%D1%82%D0%BE%D0%B2-%D0%BF%D1%80%D0%B0%D0%BA%D1%82%D0%B8%D0%BA%D0%B0.html

return
http://info.javarush.ru/javarush_articles/2015/12/03/%D0%9E%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D1%8B-%D0%BF%D0%B5%D1%80%D0%B5%D1%85%D0%BE%D0%B4%D0%B0.html

!!
Ах, эти строки...
http://info.javarush.ru/javarush_articles/2015/12/03/%D0%90%D1%85-%D1%8D%D1%82%D0%B8-%D1%81%D1%82%D1%80%D0%BE%D0%BA%D0%B8-.html