看例子练apache commons之lang篇.doc

看例子练apache commons之lang篇看commons包时的相关练习,可以用这个包提高编码效率。1. .c4c.test.apache; 2.3. importjava.io.File; 4. importjava.io.FileInputStream; 5. importjava.io.FileNotFoundException; 6. importjava.io.FileOutputStream; 7. importjava.io.IOException; 8. importjava.util.Calendar; 9. importjava.util.Date; 10. importjava.util.Iterator; 11.12. mons.lang.ArrayUtils; 13. mons.lang.CharSet; 14. mons.lang.CharSetUtils; 15. mons.lang.ClassUtils; 16. mons.lang.ObjectUtils; 17. mons.lang.RandomStringUtils; 18. mons.lang.SerializationUtils; 19. mons.lang.StringEscapeUtils; 20. mons.lang.StringUtils; 21. mons.lang.SystemUtils; 22. mons.lang.builder.EqualsBuilder; 23. mons.lang.builder.HashCodeBuilder; 24. mons.lang.builder.ToStringBuilder; 25. mons.lang.builder.ToStringStyle; 26. mons.lang.math.NumberUtils; 27. mons.lang.time.DateFormatUtils; 28. mons.lang.time.DateUtils; 29. mons.lang.time.StopWatch; 30.31. publicclassLangDemo 32. publicvoidcharSetDemo() 33. System.out.println(*CharSetDemo*); 34. CharSetcharSet=CharSet.getInstance(aeiou); 35. StringdemoStr=Thequickbrownfoxjumpsoverthelazydog.; 36. intcount=0; 37. for(inti=0,len=demoStr.length();ilen;i+) 38. if(charSet.contains(demoStr.charAt(i) 39. count+; 40. 41. 42. System.out.println(count:+count); 43. 44.45. publicvoidcharSetUtilsDemo() 46. System.out.println(*CharSetUtilsDemo*); 47. System.out.println(计算字符串中包含某字符数.); 48. System.out.println(CharSetUtils.count( 49. Thequickbrownfoxjumpsoverthelazydog.,aeiou); 50.51. System.out.println(删除字符串中某字符.); 52. System.out.println(CharSetUtils.delete( 53. Thequickbrownfoxjumpsoverthelazydog.,aeiou); 54.55. System.out.println(保留字符串中某字符.); 56. System.out.println(CharSetUtils.keep( 57. Thequickbrownfoxjumpsoverthelazydog.,aeiou); 58.59. System.out.println(合并重复的字符.); 60. System.out.println(CharSetUtils.squeeze(abbbbbbcdd,bd); 61. 62.63. publicvoidobjectUtilsDemo() 64. System.out.println(*ObjectUtilsDemo*); 65. System.out.println(Object为null时，默认打印某字符.); 66. Objectobj=null; 67. System.out.println(ObjectUtils.defaultIfNull(obj,空); 68.69. System.out.println(验证两个引用是否指向的Object是否相等,取决于Object的equals()方法.); 70. Objecta=newObject(); 71. Objectb=a; 72. Objectc=newObject(); 73. System.out.println(ObjectUtils.equals(a,b); 74. System.out.println(ObjectUtils.equals(a,c); 75.76. System.out.println(用父类Object的toString()方法返回对象信息.); 77. Datedate=newDate(); 78. System.out.println(ObjectUtils.identityToString(date); 79. System.out.println(date); 80.81. System.out.println(返回类本身的toString()方法结果,对象为null时，返回0长度字符串.); 82. System.out.println(ObjectUtils.toString(date); 83. System.out.println(ObjectUtils.toString(null); 84. System.out.println(date); 85. 86.87. publicvoidserializationUtilsDemo() 88. System.out.println(*SerializationUtils*); 89. Datedate=newDate(); 90. bytebytes=SerializationUtils.serialize(date); 91. System.out.println(ArrayUtils.toString(bytes); 92. System.out.println(date); 93.94. DatereDate=(Date)SerializationUtils.deserialize(bytes); 95. System.out.println(reDate); 96. System.out.println(ObjectUtils.equals(date,reDate); 97. System.out.println(date=reDate); 98.99. FileOutputStreamfos=null; 100. FileInputStreamfis=null; 101. try 102. fos=newFileOutputStream(newFile(d:/test.txt); 103. fis=newFileInputStream(newFile(d:/test.txt); 104. SerializationUtils.serialize(date,fos); 105. DatereDate2=(Date)SerializationUtils.deserialize(fis); 106.107. System.out.println(date.equals(reDate2); 108.109. catch(FileNotFoundExceptione) 110. e.printStackTrace(); 111. finally 112. try 113. fos.close(); 114. fis.close(); 115. catch(IOExceptione) 116. e.printStackTrace(); 117. 118. 119.120. 121.122. publicvoidrandomStringUtilsDemo() 123. System.out.println(*RandomStringUtilsDemo*); 124. System.out.println(生成指定长度的随机字符串,好像没什么用.); 125. System.out.println(RandomStringUtils.random(500); 126.127. System.out.println(在指定字符串中生成长度为n的随机字符串.); 128. System.out.println(RandomStringUtils.random(5,abcdefghijk); 129.130. System.out.println(指定从字符或数字中生成随机字符串.); 131. System.out.println(RandomStringUtils.random(5,true,false); 132. System.out.println(RandomStringUtils.random(5,false,true); 133.134. 135.136. publicvoidstringUtilsDemo() 137. System.out.println(*StringUtilsDemo*); 138. System.out.println(将字符串重复n次，将文字按某宽度居中，将字符串数组用某字符串连接.); 139. Stringheader=newString3; 140. header0=StringUtils.repeat(*,50); 141. header1=StringUtils.center(StringUtilsDemo,50,O); 142. header2=header0; 143. Stringhead=StringUtils.join(header,n); 144. System.out.println(head); 145.146. System.out.println(缩短到某长度,用.结尾.); 147. System.out.println(StringUtils.abbreviate( 148. Thequickbrownfoxjumpsoverthelazydog.,10); 149. System.out.println(StringUtils.abbreviate( 150. Thequickbrownfoxjumpsoverthelazydog.,15,10); 151.152. System.out.println(返回两字符串不同处索引号.); 153. System.out.println(StringUtils.indexOfDifference(aaabc,aaacc); 154.155. System.out.println(返回两字符串不同处开始至结束.); 156. System.out.println(StringUtils.difference(aaabcde,aaaccde); 157.158. System.out.println(截去字符串为以指定字符串结尾的部分.); 159. System.out.println(StringUtils.chomp(aaabcde,de); 160.161. System.out.println(检查一字符串是否为另一字符串的子集.); 162. System.out.println(StringUtils.containsOnly(aad,aadd); 163.164. System.out.println(检查一字符串是否不是另一字符串的子集.); 165. System.out.println(StringUtils.containsNone(defg,aadd); 166.167. System.out.println(检查一字符串是否包含另一字符串.); 168. System.out.println(StringUtils.contains(defg,ef); 169. System.out.println(StringUtils.containsOnly(ef,defg); 170.171. System.out.println(返回可以处理null的toString().); 172. System.out.println(StringUtils.defaultString(aaaa); 173. System.out.println(?+StringUtils.defaultString(null)+!); 174.175. System.out.println(去除字符中的空格.); 176. System.out.println(StringUtils.deleteWhitespace(aabbcc); 177.178. System.out.println(判断是否是某类字符.); 179. System.out.println(StringUtils.isAlpha(ab); 180. System.out.println(StringUtils.isAlphanumeric(12); 181. System.out.println(StringUtils.isBlank(); 182. System.out.println(StringUtils.isNumeric(123); 183. 184.185. publicvoidsystemUtilsDemo() 186. System.out.println(genHeader(SystemUtilsDemo); 187. System.out.println(获得系统文件分隔符.); 188. System.out.println(SystemUtils.FILE_SEPARATOR); 189.190. System.out.println(获得源文件编码.); 191. System.out.println(SystemUtils.FILE_ENCODING); 192.193. System.out.println(获得ext目录.); 194. System.out.println(SystemUtils.JAVA_EXT_DIRS); 195.196. System.out.println(获得java版本.); 197. System.out.println(SystemUtils.JAVA_VM_VERSION); 198.199. System.out.println(获得java厂商.); 200. System.out.println(SystemUtils.JAVA_VENDOR); 201. 202.203. publicvoidclassUtilsDemo() 204. System.out.println(genHeader(ClassUtilsDemo); 205. System.out.println(获取类实现的所有接口.); 206. System.out.println(ClassUtils.getAllInterfaces(Date.class); 207.208. System.out.println(获取类所有父类.); 209. System.out.println(ClassUtils.getAllSuperclasses(Date.class); 210.211. System.out.println(获取简单类名.); 212. System.out.println(ClassUtils.getShortClassName(Date.class); 213.214. System.out.println(获取包名.); 215. System.out.println(ClassUtils.getPackageName(Date.class); 216.217. System.out.println(判断是否可以转型.); 218. System.out.println(ClassUtils.isAssignable(Date.class,Object.class); 219. System.out.println(ClassUtils.isAssignable(Object.class,Date.class); 220. 221.222. publicvoidstringEscapeUtilsDemo() 223. System.out.println(genHeader(StringEcsapeUtils); 224. System.out.println(转换特殊字符.); 225. System.out.println(html:+StringEscapeUtils.escapeHtml(); 226. System.out.println(html:+StringEscapeUtils.unescapeHtml(); 227. 228.229. privatefinalclassBuildDemo 230. Stringname; 231.232. intage; 233.234. publicBuildDemo(Stringname,intage) 235. =name; 236. this.age=age; 237. 238.239. publicStringtoString() 240. ToStringBuildertsb=newToStringBuilder(this, 241. ToStringStyle.MULTI_LINE_STYLE); 242. tsb.append(Name,name); 243. tsb.append(Age,age); 244. returntsb.toString(); 245. 246.247. publicinthashCode() 248. HashCodeBuilderhcb=newHashCodeBuilder(); 249. hcb.append(name); 250. hcb.append(age); 251. returnhcb.hashCode(); 252. 253.254. publicbooleanequals(Objectobj) 255. if(!(objinstanceofBuildDemo) 256. returnfalse; 257. 258. BuildDemobd=(BuildDemo)obj; 259. EqualsBuildereb=newEqualsBuilder(); 260. eb.append(name,); 261. eb.append(age,bd.age); 262. returneb.isEquals(); 263. 264. 265.266. publicvoidbuilderDemo() 267. System.out.println(genHeader(BuilderDemo); 268. BuildDemoobj1=newBuildDemo(a,1); 269. BuildDemoobj2=newBuildDemo(b,2); 270. BuildDemoobj3=newBuildDemo(a,1); 271.272. System.out.println(toString(); 273. System.out.println(obj1); 274. System.out.println(obj2); 275. System.out.println(obj3); 276.277. System.out.println(hashCode(); 278. System.out.println(obj1.hashCode(); 279. System.out.println(obj2.hashCode(); 280. System.out.println(obj3.hashCode(); 281.282. System.out.println(equals(); 283. System.out.println(obj1.equals(obj2); 284. System.out.println(obj1.equals(obj3); 285. 286.287. publicvoidnumberUtils() 288. System.out.println(genHeader(NumberUtils); 289. System.out.println(字符串转为数字(不知道有什么用).); 290. System.out.println(NumberUtils.stringToInt(ba,33); 291.292. System.out.println(从数组中选出最大值.); 293. System.out.println(NumberUtils.max(newint1,2,3,4); 294.295. System.out.println(判断字符串是否全是整数.); 296. System.out.println(NumberUtils.isDigits(123.1); 297.298. System.out.println(判断字符串是否是有效数字.); 299. System.out.println(NumberUtils.isNumber(0123.1); 300. 301.302. publicvoiddateFormatUtilsDemo() 303. System.out.println(genHeader(DateFormatUtilsDemo); 304. System.out.println(格式化日期输出.); 305. System.out.println(DateFormatUtils.format(System.currentTimeMillis(), 306. yyyy-MM-ddHH:mm:ss); 307.308. System.out.println(秒表.); 309. StopWatchsw=newStopWatc