xml parsing in java code description

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http://stackoverflow.com – below is my java code for xml parsing. i need the description of each method what they doing java code : package com.ohile.xmlparser; import java.io.IOException; import java.net.URL; import java.util.ArrayList; import java.util.Collections; import java.util.List; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import android.os.Bundle; import or (HowTos)