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Package
A group of similar type of files or classes. Packages are declared with the package keyword.

Peer
In networking, any functional unit in the same layer as another entity.

Persistence
The protocol for transferring the state of a bean between its instance variables and an underlying database.

Pixel
The picture element on a display area, such as a monitor screen or printed page. Each pixel is individually accessible.

POA
Portable Object Adapter. A CORBA standard for building server-side applications that are portable across heterogeneous ORBs.

Primary key
An object that uniquely identifies an entity bean within a home.

Primitive type
A variable data type in which the variable's value is of the appropriate size and format for its type: a number, a character, or a boolean value.

Principal
The identity assigned to an entity as a result of authentication.

Private
A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by other elements of its class.

Privilege
A security attribute that does not have the property of uniqueness and which may be shared by many principals. An example of a privilege is a group.

Process
A virtual address space containing one or more threads.

Property
Characteristics of an object that users can set, such as the color of a window.

Profiles
A profile is a collection of Java APIs that complements one or more Java 2 Platform Editions by adding domain-specific capabilities. Profiles may also include other defined profiles. A profile implementation requires a Java 2 Platform Edition to create a complete development and deployment environment in a targeted vertical market. Each profile is subject to an associated set of compatibility requirements.
Profiles may be usable on one or more editions.
Some examples of profiles within the Java 2 Platform, Micro Edition are:

Personal Profile- for non-PC products that need to display Web-compatible Java-based content.

Java Card - for secure smart cards and other severely memory-constrained devices.

Protected
A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by elements residing in its class, subclasses, or classes in the same package.

Public
A Java keyword used in a method or variable declaration. It signifies that the method or variable can be accessed by elements residing in other classes.