Input
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| comparison operators | operators used to compare the value of of numbers as greater than, less than, equal to or not equal too and resolves as true or false
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| concatenation | joining different types of data into one output line of code
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| conditional expression | an expression that can be evaluated as true or falsed based upon comparison of values or results of methods
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| constant | a storage location for data that has value that will not change.. Such as PI
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| counter | also called an accumulator - a running total where the value of is added to the current total each time it's executed
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| declaration statement | a line of code that identifies (declares) the data type and names the identifier of the variable
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| dialog box | a small window that displays messages and can acccept user input
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| double | data type that stores numbers with up to 15 decimal positions as double floating point values
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| equality operators | also called relational operators, or comparison operators
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| ERROR_MESSAGE | the constant used to display a red X icon on a dialog box
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| event handlers | methods that specify what will happen when an event is sent to the listener intervace, such as key event or mouse event
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| exit() method | method used to terminate an GUI application
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| float | data type that stores numbers with up to 7 decimal places as single floating point values
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| getText() method | method used to get text from a label, textfield or other AWT or Swing component that uses text
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| INFORMATION_MESSAGE | the constant used to display a blue letter "I" on a dialog box
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| InputStreamReader | Java class (object) that reads what's stored in the computer's buffer, and wraps it to present to the program
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| instantiate | The process of constructing, or delcaring an object from a previously defined class
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| int | data type that stores whole number values in a 32-bit location (not greater than 29387 or less than -86421)
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| ItemEvent | the class usedd to identify when a user selects or deselects an item such as a checkbox or an option button
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| ItemListener | the listener used to watch for an item event
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| java.awt.event package | Java package that provides interfaces and classes for dealing with AWT components,
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| javax.swing | Java package the provides lightweight Java-based GUI components
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| JOptionPane | a class used to display standard dialog boxes
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| KeyEvent | the class used to identify when a user presses a key
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| KeyListener | the listener used to listen for key events
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| long | data type that stores whole number values in a 64 bit location
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| Math class | class part of the java.lang package that contains useful mathematical functions such as round, exponentiation, randomizing and square roots
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| max() method | method used to return the higher of two compared numbers
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| min() method | method used to return the lower of two compared numbers
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| modal | A type of dialog box that forces the user to complete an action before continuing
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| modulus operator | the percent sign, also called the remainder, as it divides two integers and returns only the left over amount - 9%2=1
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| MouseEvent | the class used to identify when a user performs a mouse action
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| MouseListener | the listener used to listen for mouse events
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| parse() method | method in the wrapper class that convers strings to numeric data types, for example parseInt() or parseDouble()
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| PLAIN_MESSAGE | the constant used when no icon is necessary on a dialog box
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| pow() method | method used to express exponentiation requirng the base number and the exponent separated by a comma
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| primitive data types | a datatype structured to hold single items, such as integer, character, floating point, and true/false values.
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| promotes | temporarily changing a smaller data type to a larger one before evaulating an expression such as integer promoted to a float
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| QUESTION_MESSAGE | the constant used to display a green question mark on a dialog box
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| random() method | method used to generate a random float number
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| readLine() method | method from the BufferedReader class tha reads the inputted text and returns a string containing the contents of the line
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| reference data type | a data type whose value is an address because it holds object types not values
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| relational operators | also called comparison operators or equality operators
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| round() method | method used to round a float to an integer
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| scope | where the variable, reference or method can be seen and recognized has having value
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| short | data type that stores whole number values in 16-bit location (values from -32768 to 32767)
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| sqrt() method | method used to determine the square root of numbers
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| stream | data flowing into or out of a program
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| System.err | System class that sends prompts and error messagse to the screen for capture
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| System.in | System class that accepts input from the keyboard buffer using the InputStreamReader
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| System.out | System class that sends output to the display or directs output to a file
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| TextEvent | the class used to identify what happens when the user changes text in a text box
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| TextListener | the listener used to listen for text events
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| throws IOException | a line of code that gives the program a way to acknowledge and handle potential input or output errors, and still compile correctly
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| WARNING_MESSAGE | the constant used to display a yellow exclamation point on a dialog box
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| WindowEvent | the class used to identify what happens when the window changes, such as open or close
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| WindowListener | the listener used to watch for window events
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| wrapper class | a class used to help primitive data types conform to their Object class counterparts
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| equality operator | use of the double equal sign (==) to compare if two values are equal. Not to be confused with the assignment (=) operator.
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