Here you can find the source of totalPolicies(Class className)
public static int totalPolicies(Class className) throws IOException
//package com.java2s; /******************************************************************************* * Copyright (c) 2006-2010 eBay Inc. All Rights Reserved. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * *******************************************************************************/ import java.io.IOException; import java.io.InputStream; import java.util.Iterator; import java.util.Properties; import java.util.Set; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static int totalPolicies(Class className) throws IOException { Properties props = new Properties(); InputStream input = className.getResourceAsStream(className.getSimpleName() + ".properties"); props.load(input);//from ww w . j a v a 2 s .c om Pattern pattern = Pattern.compile("policyName" + "_" + "policy(\\d)"); Matcher matcher = null; Set s = props.keySet(); Iterator ite = s.iterator(); int max = 0; int value; while (ite.hasNext()) { matcher = pattern.matcher(ite.next().toString()); if (matcher.find()) { value = Integer.parseInt(matcher.group(1)); if (value > max) max = value; } } System.out.println("max value=" + max); return max; } }