Variables
basic data types (primitive types, character strings, and arrays), default values, and literals.
Expressions, Statements, and Blocks –An expression is a construct made up of variables, operators, and method invocations, which are constructed according to the syntax of the language, that evaluates to a single value.
–Blocks a group of zero or more statements between balanced braces and can be used anywhere a single statement is allowed.
When you compile code, the compilor (usually another program) takes the program the human wrote, and converts it into the program the computer can understand (i.e. converts from Java to machine language).
Whether you are working on a new cutting edge app or simply ramping up on new technology, Java documentation has all the information you need to make your project a smashing success.
Java has a standard Application Programming Interface —a huge library consisting of over 4,000 classes, each with its own functionality, its own limitations, and its own rules for effective use.