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