examples.gui.Calculator Class Reference

Detailed Description

A simple calculator.

The code for this window is an adaptation of the Java Codex example.

The original code on Java Codex is interesting since it contains a genuine fault that can be detected using the Monkey: clicking on − followed by = throws a NumberFormatException. This error is not intentional and corresponds to a case that the source code does not properly take into account. For the purpose of the example, this fault can be disabled from the code by calling disableNumberFormatException().

The calculator has been modified so that other exceptions can be thrown:

• Dividing by zero throws an IllegalArgumentException, which is expected
• Any result producing a value greater than 100,000 produces an OverflowException. The calculator can obviously manipulate larger values; this limitation is artificial. It is enabled by calling hasOverflow().

Definition at line 62 of file Calculator.java.

Inheritance diagram for examples.gui.Calculator:

Classes
class	CalculatorPanel
	The actual panel containing the interface of the calculator. More...
class	OverflowException
	Exception that is thrown when the calculator produces an overflow.
class	UnderflowException
	Exception that is thrown when the calculator produces an underflow.

Public Member Functions
	Calculator ()
	Creates a new calculator window. More...
Calculator	hasOverflow ()
	Instructs the calculator to throw an OverflowException when producing a number over 100,000. More...
Calculator	disableNumberFormatException ()
	Instructs the calculator to check the format of numbers and ignore parsing errors. More...
JButton	getButton (String label)
	Gets the button instance with given label. More...
void	reset ()
	Puts the object back into its initial state. More...

Static Public Member Functions
static void	main (String[] args)
	A main method allowing the calculator to be run as a stand-alone application. More...

Static Public Attributes
static final String[]	BUTTON_LABELS
	The array of button labels. More...

Protected Attributes
Map< String, JButton >	m_buttons
	A map associating each button to its label. More...
CalculatorPanel	m_panel
	The calculator panel contained within the frame. More...
boolean	m_checkFormat
	A flag specifying if the calculator checks the format of numbers. More...
boolean	m_hasOverflow
	A flag specifying if the calculator produces an overflow exception. More...

Constructor & Destructor Documentation

Calculator()

examples.gui.Calculator.Calculator

(

)

Creates a new calculator window.

Definition at line 98 of file Calculator.java.

Member Function Documentation

disableNumberFormatException()

Calculator examples.gui.Calculator.disableNumberFormatException

(

)

Instructs the calculator to check the format of numbers and ignore parsing errors.

Returns

Definition at line 129 of file Calculator.java.

getButton()

JButton examples.gui.Calculator.getButton

(

String

label

)

Gets the button instance with given label.

Parameters

label

The label

Returns

The button instance

Definition at line 141 of file Calculator.java.

hasOverflow()

Calculator examples.gui.Calculator.hasOverflow

(

)

Instructs the calculator to throw an OverflowException when producing a number over 100,000.

Returns

This calculator

Definition at line 118 of file Calculator.java.

main()

static void examples.gui.Calculator.main ( String[]  args )

static

A main method allowing the calculator to be run as a stand-alone application.

Parameters

args	Command-line arguments

Definition at line 157 of file Calculator.java.

reset()

void examples.gui.Calculator.reset

(

)

Puts the object back into its initial state.

Implements ca.uqac.lif.synthia.Resettable.

Definition at line 147 of file Calculator.java.

Member Data Documentation

BUTTON_LABELS

final String [] examples.gui.Calculator.BUTTON_LABELS

static

Initial value:

= {"7", "8", "9", "\u00f7", 
            "4", "5", "6", "\u00d7", "1", "2", "3", "\u2212", "0", ".", "=", "+"}

The array of button labels.

Definition at line 67 of file Calculator.java.

m_buttons

Map<String,JButton> examples.gui.Calculator.m_buttons

protected

A map associating each button to its label.

Definition at line 78 of file Calculator.java.

m_checkFormat

boolean examples.gui.Calculator.m_checkFormat

protected

A flag specifying if the calculator checks the format of numbers.

Definition at line 88 of file Calculator.java.

m_hasOverflow

boolean examples.gui.Calculator.m_hasOverflow

protected

A flag specifying if the calculator produces an overflow exception.

Definition at line 93 of file Calculator.java.

m_panel

CalculatorPanel examples.gui.Calculator.m_panel

protected

The calculator panel contained within the frame.

Definition at line 83 of file Calculator.java.

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The documentation for this class was generated from the following file:

• Source/Examples/src/examples/gui/Calculator.java