看commons包時的相關練習,可以用這個包提高編碼效率。

package org.raistlin.test.apache;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;

import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.CharSet;
import org.apache.commons.lang.CharSetUtils;
import org.apache.commons.lang.ClassUtils;
import org.apache.commons.lang.ObjectUtils;
import org.apache.commons.lang.RandomStringUtils;
import org.apache.commons.lang.SerializationUtils;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.SystemUtils;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import org.apache.commons.lang.math.NumberUtils;
import org.apache.commons.lang.time.DateFormatUtils;
import org.apache.commons.lang.time.DateUtils;
import org.apache.commons.lang.time.StopWatch;

public class LangDemo
{
    public void charSetDemo()
    {
        System.out.        CharSet charSet = CharSet.getInstance("aeiou");
        String demoStr = "The quick brown fox jumps over the lazy dog.";
        int count = 0;
        for (int i = 0, len = demoStr.length(); i < len; i++)
        {
            if (charSet.contains(demoStr.charAt(i)))
            {
                count++;
            }
        }
        System.out.println("count: " + count);
    }

    public void charSetUtilsDemo()
    {
        System.out.println("**CharSetUtilsDemo**");
        System.out.println("計算字符串中包含某字符數.");
        System.out.println(CharSetUtils.count(
                "The quick brown fox jumps over the lazy dog.", "aeiou"));