EDU.ksu.cis.calculator.javamodel
Class Subtract

java.lang.Object
  |
  +--EDU.ksu.cis.calculator.javamodel.Subtract
All Implemented Interfaces:
EncodedOperation, Operation

public class Subtract
extends Object
implements EncodedOperation

The subtract operation.

Author:
Rod Howell (howell@cis.ksu.edu)

Constructor Summary
Subtract()
           
 
Method Summary
 Object doOperation(Object[] operands)
          Returns the result of subtracting operand[1] from operand[0].
 int numOperands()
          Returns 2.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Subtract

public Subtract()
Method Detail

numOperands

public int numOperands()
Returns 2.

Specified by:
numOperands in interface Operation

doOperation

public Object doOperation(Object[] operands)
                   throws ArrayIndexOutOfBoundsException,
                          ClassCastException
Returns the result of subtracting operand[1] from operand[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 2.
ClassCastException - If the elements of operands are not both BigIntegers.