EDU.ksu.cis.calculator.defaultmodel
Class ChangeSigns

java.lang.Object
  |
  +--EDU.ksu.cis.calculator.defaultmodel.ChangeSigns

All Implemented Interfaces:

EncodedOperation, Operation

public class ChangeSigns

extends Object

implements EncodedOperation

The change signs operation.

Author:

Rod Howell (howell@cis.ksu.edu)

Constructor Summary

ChangeSigns()

Method Summary

Object	doOperation(Object[] operands) Returns negation of operands[0].
int	numOperands() Returns 1.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChangeSigns

public ChangeSigns()

Method Detail

numOperands

public int numOperands()

Returns 1.

Specified by:

numOperands in interface Operation

doOperation

public Object doOperation(Object[] operands)
                   throws ArrayIndexOutOfBoundsException,
                          ClassCastException

Returns negation of operands[0].

Specified by:

doOperation in interface EncodedOperation

Parameters:

operands - The operands for the operation. The length of this array should match the value returned by Operation.numOperands().

Returns:

The result of the operation.

Throws:

ArrayIndexOutOfBoundsException - If operands is not of length at least 1.

ClassCastException - If operands[0] is not a LargeInteger.