Class Operators

java.lang.Object
  Operators

public class Operators
extends java.lang.Object

Constructor Summary

Operators()

Method Summary

int	getPrecedence(java.lang.String op) Given a string, returns precedence of corresponding operator
boolean	isOperator(java.lang.String op) Given a string, returns true if that string is a defined operator ("+", "-", etc) and false otherwise.

Methods inherited from class java.lang.Object

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

Constructor Detail

Operators

public Operators()

Method Detail

isOperator

public boolean isOperator(java.lang.String op)

Given a string, returns true if that string is a defined operator ("+", "-", etc) and false otherwise.

Parameters:

op - String representing an operator

Returns:

True if valid operator, false otherwise.

getPrecedence

public int getPrecedence(java.lang.String op)

Given a string, returns precedence of corresponding operator

Parameters:

op - String representing an operator

Returns:

integer precedence. 0 is lowest.

Throws:

java.lang.IllegalArgumentException - if the argument is not a valid operator