step01
Class Adder

Object
  Adder

All Implemented Interfaces:

Visitor

public class Adder
extends Object
implements Visitor

a visitor to compute the value of an XML-based arithmetic expression.

Constructor Summary

Adder()

Method Summary

Integer	add(Element e) deal with <add>.
Integer	document(Document d) delegate to the document's root element.
Integer	element(Element e) delegate to methods based on element name.
static void	main(String... arg) take a XML-based arithmetic expression from standard input and write the value to standard output.
Integer	number(Element e) deal with <number>.
Integer	subtract(Element e) deal with <subtract>.

Methods inherited from class Object

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

Constructor Detail

Adder

public Adder()

Method Detail

document

public Integer document(Document d)

delegate to the document's root element.

Specified by:

document in interface Visitor

element

public Integer element(Element e)

delegate to methods based on element name.

Specified by:

element in interface Visitor

add

public Integer add(Element e)

deal with <add>.

subtract

public Integer subtract(Element e)

deal with <subtract>.

number

public Integer number(Element e)

deal with <number>.

main

public static void main(String... arg)
                 throws Exception

take a XML-based arithmetic expression from standard input and write the value to standard output.

Throws:

Exception