Token

Class Token

java.lang.Object
  Token

public class Token
extends java.lang.Object
extends java.lang.Object

A Token class in which tokens know whether they are operators or numbers and can return appropriate values. If a token cannot be created from the string, an IllegalArgumentException is thrown. The legal operators are + - * / ( )

Author:: Beth Katz

Field Summary
`static java.lang.String`	`OperatorList`

Constructor Summary
`Token(java.lang.Double d)` Build a number Token from a Double.
`Token(java.lang.String s)` Build a Token from a String.

Method Summary
`boolean`	`hasHigherPrecedenceThan(Token other)` Whether or not the Token has higher precedence than other Token
`boolean`	`isLeftParen()` Whether or not the Token is a left parentheses.
`boolean`	`isNumber()` Whether or not the Token is a number.
`boolean`	`isOperator()` Whether or not the Token is an operator.
`boolean`	`isRightParen()` Whether or not the Token is a right parentheses.
`java.lang.Double`	`numberValue()` The numeric value of the Token if it is a number Token Throws IllegalArgumentException if Token is not a number
`java.lang.Character`	`operatorCharValue()` The character value of the Token if it is an operator Token Throws IllegalArgumentException if Token is not an operator
`java.lang.String`	`toString()` String representation of the Token

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

OperatorList

public static final java.lang.String OperatorList

See Also:: Constant Field Values

Constructor Detail

Token

public Token(java.lang.Double d)

Build a number Token from a Double.

Parameters:: s - Double containing a Token.

Token

public Token(java.lang.String s)

Build a Token from a String. This can build number Tokens.

Parameters:: s - String containing a potential Token. Will throw IllegalArgumentException if Token cannot be built.

Method Detail

hasHigherPrecedenceThan

public boolean hasHigherPrecedenceThan(Token other)

Whether or not the Token has higher precedence than other Token

Returns:: true if Token has higher precedence, false if not

isLeftParen

public boolean isLeftParen()

Whether or not the Token is a left parentheses.

Returns:: true if Token is a left parentheses, false if not

isNumber

public boolean isNumber()

Whether or not the Token is a number.

Returns:: true if Token is a number, false if not

isOperator

public boolean isOperator()

Whether or not the Token is an operator. Parentheses are not operators.

Returns:: true if Token is a operator, false if not

isRightParen

public boolean isRightParen()

Whether or not the Token is a right parentheses.

Returns:: true if Token is a right parentheses, false if not

numberValue

public java.lang.Double numberValue()

The numeric value of the Token if it is a number Token Throws IllegalArgumentException if Token is not a number

Returns:: Token's Double value

operatorCharValue

public java.lang.Character operatorCharValue()

The character value of the Token if it is an operator Token Throws IllegalArgumentException if Token is not an operator

Returns:: Token's char value

toString

public java.lang.String toString()

String representation of the Token

Overrides:: toString in class java.lang.Object