Any time you need quick answers for developing or debugging Java programs, this pocket guide is the ideal reference to standard features of the Java programming language and its platform. You'll find helpful programming examples, tables, figures, and lists fast—including Java 9 features such as modular source code and the new J SheII interactive command-line REPL. It's a handy companion, whether you're in the office, in the lab, or on the road. SheII interactive command-line REPL. It's a handy companion, whether you're in the office, in the lab, or on the road.