@author

{@link}

@serialField

@arg

An identifier can include letters and the first character can be a letter.

An identifier can include digits, but the first character cannot be a digit.

An identifier's length can exceed the length of the current line.

The symbol for PI (3.14159...) is a valid identifier.

null

transient

assert

const

Double precision floating-point (double)

Character (char)

Byte integer (byte)

Boolean (boolean)

User-defined types are also known as reference types.

User-defined types are only defined via classes and interfaces.

An array type is signified by an identifier and one or more pairs of square brackets.

The declaration int[] x; introduces an array type.

The attributes of the class are all private

The class refers to a small number of other objects

The object contains only a small number of variables

The object is referred to using an anonymous variable, not directly

The reference variable is declared for an interface type, not a class. The interface provides a small number of methods

must be created via a Java IDE.

can run on different machines, but only with the same Operating System.

are typically based on Servlets, JSPs and Enterprise Java Beans.

need no runtime environment.