Introduction to Java Programming
About Java
AP Computer Science course includes algorithm analysis, data structures, and the techniques and methods of modern programming, specifically, object oriented programming. High-level programming language is used to explore this concept. JAVA is the language currently in use on the AP exam. Java was provided by James Gosling and a team at Sun Microsystems in California. The AP exam covers a clearly defined subset of Java language features.
Java provides basic control structures such as the [if-else] statement, [for] loop, [for-each] loop, and [while] loop, as well as fundamental built-in data types. But the power of the language lies in the manipulation of user-defined types called objects, many of which can interact in a single program.
Packages and Classes
In Java, related classes are grouped into packages, many of which are provided with the compiler. The package [java.lang], which contains many commonly used classes, is automatically provided to all Java programs. To use any other package in a program, an import statement must be used. The import statement allows the programmer to use the objects and methods defined in the designated package. By convention Java package names are lowercase.
Java program must have at least one class, the one that contains the main method. The Java files that comprise your program are called [source] files. A compiler converts source code into machine-readable form called [bytecode].
Types and Identifiers
An identifier is a name for a variable, parameter, constant user-defined method, or user-defined class. In Java, an identifier is any sequence of letters, digits, and the underscore character. Identifiers are case sensitive, which means that [age] and [Age] are different.
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