Chapter 3 Java | Syntax, Errors, and Debugging
Screen Coordinate System
A coordinate system used by most programming languages in which the origin is in the upper-left corner of the screen, window, or panel, and the y values increase toward the bottom of the drawing area.
Coordinate System
A grid that allows a programmer to specify positions of points in a plane or of pixels on a computer screen.
Package
A group of related classes in a named directory; makes it easy for programmers to share code.
Virus
A program that can enter a computer and perhaps destroy information.
Pseudocode
A stylized half-English, half-code language written in English but suggesting Java code.
Exception
An abnormal state or error that occurs during runtime and is signaled by the operating system.
Literal
An item in a program whose value does not change.
Arithmetic Expression
Consists of operands and operators combined in a manner familiar from algebra.
Syntax
Consists of the rules for combining words into sentences, or a statement.
Semantics
Define the rules for interpreting the meaning of statements.
Syntax Errors
Errors detected at compile time for when we violate a syntax rule. For example: a missing semicolon after a statement.
Comments
Explanatory sentences inserted in a program in such a manner that the compiler ignores them.
Graphics Content
In Java, an object associated with a component where the images for that component are drawn.
Run-time Error
Occur when we ask the computer to do something that it considers illegal, such as dividing by 0.
Logic Error
Occur when we fail to express ourselves accurately; also called design errors or bugs.
Variable Declaration Statement
The form that introduces a new variable name and its data type in a program.
Method Signature
The name and formal parameters of a method.
Origin
The upper-left corner of a screen coordinate system.
Reserved Words
Words that cannot be employed as user-defined symbols; also known as keywords. Examples: true, false, import, etc.
