http://outofmemory.cn/code-snippet/815/java-zishutongji
一个api，位于apache.commons.lang.StringUtils类下的一个StringUtils.countMatches(paragraph, string);方法，这个方法返回值是一个数字

 

 

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package cn.outofmemory;

import org.apache.commons.lang3.StringUtils;

public class WordCounter {

    public static void main(String[] args) {

        // String with our paragraph
        String paragraph = "Java Code Geeks (JCGs) is an independent online community focused on creating the"
        + "ultimate Java-to-Java developers resource center; targeted at the technical architect, technical"
        + "team lead (senior developer), project manager and junior developers alike. JCGs serve the Java, "
        + "Scala, Android, SOA, Agile and Telecom communities with daily news written by domain experts, "
        + "articles, tutorials, reviews, announcements, code snippets and open source projects.";

        // Declare the word you want to search
        String string = "Java";

        // Count word repetitions
        int counter = StringUtils.countMatches(paragraph, string);

        // Print the result
        System.out.println("Word <" + string + "> appeared " + counter + " times in the paragraph.");
    }
}