https://2.bp.blogspot.com/-ruD2fkypSrQ/Vvz8Wc_7LKI/AAAAAAAALc0/Ce7ayAVIhEcvC5BL8AvHGjBbfsgeXBStg/s1600/Java%2BTutorial%2B%253D%2BJava%2BString%2B%255BcontentEquals%2528StringBuffer%2Bsb%2529%2Bmethod%255D.jpg