Java

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API

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standard set of interfaces & classes functionally grped into packages

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Application Software Packages

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programs required for common business & personal apps such as word processing or excel

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Event-driven

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Nothing happens unless trigger sends a message and causes the event to occur

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event diagram

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shows relationships among events & operations visually & help plan how they will program events.

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class providers

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programmers who focus on creating classes & objects

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class users

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programmers who leverage their knowledge of business processe to assemble apps using OOP methods/tools.

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generalization hierarchy

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aka class diagram, OOD tool used to show relationships among classes

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information hiding

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process of making implementation & programming details transparent to user

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instance

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unique object/specific occurence of class of objects

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IDE

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builder tools

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message

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activates program to perform 1 of 2 operations

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polymorphism

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allows instruction to be given to an obejct using generalized rather than specific, detailed instructions

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server-software

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responds to incoming requests and serves different types of data

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servlet

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module of java code that is osted and run on a web server rather htan being launched from a browser `

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subclassing

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AKA inheritance, use a class to make a subclass, save time.

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web server

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computer that hosts web pages, programs, intranet, etc.,

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validate

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both programmer & user must check the program

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User interface

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the way in which a user enters datas and instructions into a computer and receives feedback from the computer

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Splash screen

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screen that is displayed before the main program is displayed

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System date

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current date and time generated by the operating system of a computer

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Default

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preset feature of the computer

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Coding window

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area where you can enter and edit lines of Java code.

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Selector window

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displays a list of open TextPad files.

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Clip Library Window

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- a list of special codes and tags used by some scripting tools and languages such as HTML

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Block comment

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begins with (*/) ends with (*/), can span as many lines as possible

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Doc comment

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Starts with (/**) ends with (*/) provide concise summary

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Public

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access modifier

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Access modifier-

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- scope identifier, specifies the circumstances in which the class can be accessed.

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Keywords

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reserved words, the java compiler does not accept as class name

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Method header

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notifies the Java compiler of the method’s attributes

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Main() method-

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the starting point during execution

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Method modifier-

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used to set properties for the method.

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Static-

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method is unique and can be invoked without creating a subclass or instance.

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Return value

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result or answer of a method

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Void-

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method that does not return data

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Parameter

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piece of data received by the method to help the method perform its operation

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argument

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- sends data to a method

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Identifier-

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- any word you choose to name an item in a java program

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Variable-

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location in computer memory that can change values as the code executes

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Data type

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word tat describes the type or category of data the method uses

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String[]-

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String data type

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Class definition

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defines the instance and class variables and methods available for use in the class

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System class

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contains several useful class variables and methods

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Extend

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- inherits, methods from its supercalss

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Out-

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refers to the object representing the default display

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Println() method-

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returns its value to the System.out device.

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Literal-

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- data inside the quotes will be displayed exactly as entered in the code

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System error-

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system command is not set properly

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Syntax error

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error caused by code statements that violate one or more syntax rules of the Java programming language.

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Command Results Window

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window comes out after compile

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Semantic error-

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an error that changes the meaning of the code

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Logic error-

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occurs when a program does not behave as intended due to poor design or incorrect implemntation of the design

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Run-time error-

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aka exception, error occurs when unexpected conditions arise as you run or execute the program

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Import statement

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tell the compiler where to access the classes fields and methods of an existing class in the package

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Date class-

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represents a specific instant in time, measured to the nearest millisecond

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Constructor-

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identified by the = new notation

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Declare-

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they type of datat or object by entering the name of the java dtat type followed by the variable name

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Escape characters-

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inside the String arguments of the println() method to move insertion point

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Concatenate

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two or more Strings (+) inbetween

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Applet package-

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two or more Strings (+) inbetween

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Abstract Window Toolkit (AWT)-

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included with SDK to provide programs access to color, draw methods, and other GUI elements commonly used in applets

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Extends command-

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added to class header along with the name of a class object and shares a common structure and behavior with its subclasses

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Init() method

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loads the initial setup of the applet when execution begins

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Paint() method-

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graphically draw text and an image on the applet screen after the applet is initialized.

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Reference variable

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when a method refers to an instance of an object, such as Graphics g

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DrawString() method-

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taken from the awt package draws text in the applet window

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ToString() method

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can be used to convert currentDate to a string

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Image object-

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declared before its method can be used

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GetImage() method

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used to load images into a method

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GetDocumentBase() method-

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- allows applet to pull image from current folder in which your applet class is stored

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DrawImage() method-

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specifies the location where the program should draw the graphic

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SetBackground() method-

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takes color object and its attribute to change the background color of the applet window.

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Tag-

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markup, code specifying how web page content should display or link to other documents, start tag, end tag <>