The upgrade exams are for candidates who already hold an SCJP certification under a prior version and want to be certified under a more recent version.
Oracle acquired Sun in 2010, and since that time Oracle's hardware and software engineers have worked side-by-side to build fully integrated systems and optimized solutions designed to achieve performance levels that are unmatched in the industry.
In prior releases, the standard way to represent an enumerated type was the int Enum pattern: // int Enum Pattern - has severe problems! public static final int SEASON_WINTER = 0; public static final int SEASON_SPRING = 1; public static final int SEASON_SUMMER = 2; public static final int SEASON_FALL = 3;