slogo.instruction

Class Difference

java.lang.Object

slogo.GrammarElement

slogo.instruction.Instruction

slogo.instruction.Difference

public class Difference
extends Instruction

Field Summary

Fields

Modifier and Type	Field and Description
private GrammarElement	expression1
private GrammarElement	expression2

Fields inherited from class slogo.GrammarElement

gelementsToValue

Constructor Summary

Constructors

Constructor and Description
Difference(GrammarElement e, GrammarElement f) Represents a difference instruction that can be executed

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(Context c) Evaluate this instruction in a Context.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

expression1

private GrammarElement expression1

expression2

private GrammarElement expression2

Constructor Detail

Difference

public Difference(GrammarElement e,
                  GrammarElement f)

Represents a difference instruction that can be executed

Parameters:

e - the first element in the difference

f - the second element in the difference

Method Detail

evaluate

public java.lang.Object evaluate(Context c)

Evaluate this instruction in a Context.

Specified by:

evaluate in class Instruction

Parameters:

c - the Context for the evaluation

Returns:

the result of evaluating the instruction list the last time

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

Returns:

difference with the two expressions