杨_飞

最常用的1000个Java类（附代码示例）

分析Github 3000个开源项目，粗略统计如下。括号内的数字是使用频率 0－3000. 下面的列表显示不全，完整的请看完整列表。

1. java.util.List (2889)

2. java.util.ArrayList    (2831)
3. java.io.IOException    (2813)
4. java.util.Map    (2592)
5. java.util.HashMap    (2541)
6. java.io.File    (2195)
7. java.io.InputStream    (2125)
8. java.util.Arrays    (2068)
9. java.util.Collections    (2028)
10. java.util.Set    (2019)
11. java.util.Iterator    (1954)
12. java.util.Collection    (1734)
13. java.util.HashSet    (1721)
14. java.util.Date    (1679)
15. java.net.URL    (1548)
16. java.io.FileInputStream    (1495)
17. org.junit.Test    (1463)
18. java.io.BufferedReader    (1432)
19. java.io.OutputStream    (1391)
20. java.io.InputStreamReader    (1389)
21. java.io.FileOutputStream    (1378)
22. java.util.regex.Pattern    (1314)
23. java.io.FileNotFoundException    (1294)
24. java.io.Serializable    (1257)
25. java.lang.reflect.Method    (1229)
26. java.io.ByteArrayOutputStream    (1206)
27. java.util.LinkedList    (1194)
28. java.util.Properties    (1157)
29. java.text.SimpleDateFormat    (1103)
30. java.io.ByteArrayInputStream    (1079)
31. java.util.regex.Matcher    (1064)
32. java.io.UnsupportedEncodingException    (1047)
33. java.util.Locale    (1009)
34. java.util.Comparator    (1007)
35. org.junit.Before    (1005)
36. java.util.Enumeration    (949)
37. java.io.PrintWriter    (931)
38. java.util.Random    (928)
39. java.lang.reflect.InvocationTargetException    (918)
40. java.net.MalformedURLException    (916)
41. java.util.Map.Entry    (899)
42. java.util.Calendar    (859)
43. java.io.StringWriter    (819)
44. java.lang.reflect.Field    (790)
45. java.util.LinkedHashMap    (788)
46. java.net.URI    (781)
47. junit.framework.TestCase    (720)
48. java.io.Reader    (717)
49. java.io.Writer    (706)
50. java.util.concurrent.TimeUnit    (699)
51. java.io.FileReader    (691)
52. java.io.FileWriter    (682)
53. java.io.StringReader    (680)
54. java.util.logging.Logger    (677)
55. java.lang.reflect.Constructor    (664)
56. java.text.ParseException    (649)
57. java.net.URISyntaxException    (644)
58. javax.servlet.http.HttpServletRequest    (636)
59. java.lang.annotation.Retention    (635)
60. java.util.TreeSet    (632)
61. org.slf4j.Logger    (627)
62. java.util.concurrent.ConcurrentHashMap    (625)
63. java.io.OutputStreamWriter    (622)
64. java.util.TreeMap    (621)
65. java.util.StringTokenizer    (619)
66. org.slf4j.LoggerFactory    (618)
67. java.text.DateFormat    (607)
68. android.os.Bundle    (605)
69. org.junit.After    (605)
70. javax.servlet.http.HttpServletResponse    (603)
71. android.content.Context    (603)
72. java.io.BufferedInputStream    (600)
73. java.security.NoSuchAlgorithmException    (592)
74. java.util.logging.Level    (589)
75. java.lang.annotation.Target    (588)
76. java.util.concurrent.Executors    (588)
77. org.xml.sax.SAXException    (586)
78. android.util.Log    (583)
79. java.util.Vector    (583)
80. android.content.Intent    (578)
81. org.junit.runner.RunWith    (577)
82. android.app.Activity    (575)
83. javax.servlet.ServletException    (568)
84. android.view.View    (567)
85. java.lang.annotation.RetentionPolicy    (559)
86. java.util.Hashtable    (559)
87. java.security.MessageDigest    (553)
88. junit.framework.Assert    (548)
89. org.junit.Assert    (548)
90. java.io.PrintStream    (546)
91. java.net.InetAddress    (537)
92. java.util.UUID    (526)
93. android.widget.TextView    (524)
94. java.net.URLEncoder    (521)
95. org.w3c.dom.Document    (521)
96. java.lang.annotation.ElementType    (520)
97. java.net.UnknownHostException    (518)
98. java.nio.charset.Charset    (516)
99. java.io.BufferedWriter    (513)
100. java.util.concurrent.ExecutorService    (503)
101. javax.xml.parsers.DocumentBuilderFactory    (487)
102. java.nio.ByteBuffer    (481)
103. java.io.ObjectInputStream    (481)
104. java.util.concurrent.atomic.AtomicInteger    (467)
105. java.io.ObjectOutputStream    (467)
106. android.widget.Toast    (466)
107. java.util.NoSuchElementException    (466)
108. org.w3c.dom.Element    (463)
109. java.util.LinkedHashSet    (461)
110. java.io.BufferedOutputStream    (461)
111. java.math.BigInteger    (459)
112. android.os.Handler    (451)
113. org.junit.BeforeClass    (450)
114. android.content.SharedPreferences    (449)
115. android.content.DialogInterface    (449)
116. android.view.ViewGroup    (444)
117. java.math.BigDecimal    (443)
118. java.lang.reflect.Modifier    (441)
119. android.net.Uri    (437)
120. javax.xml.parsers.ParserConfigurationException    (437)
121. java.net.Socket    (436)
122. android.app.AlertDialog    (436)
123. org.w3c.dom.NodeList    (428)
124. java.util.Stack    (428)
125. android.widget.Button    (428)
126. javax.xml.parsers.DocumentBuilder    (427)
127. java.net.URLConnection    (426)
128. android.view.LayoutInflater    (423)
129. org.w3c.dom.Node    (422)
130. java.util.TimeZone    (422)
131. java.sql.SQLException    (421)
132. android.widget.ListView    (406)
133. org.xml.sax.InputSource    (405)
134. org.apache.log4j.Logger    (398)
135. android.view.MenuItem    (394)
136. android.widget.ImageView    (394)
137. org.apache.http.HttpResponse    (389)
138. org.apache.http.impl.client.DefaultHttpClient    (388)
139. java.net.HttpURLConnection    (387)
140. org.junit.Ignore    (386)
141. java.net.InetSocketAddress    (385)
142. android.util.AttributeSet    (383)
143. java.lang.reflect.Array    (383)
144. android.view.View.OnClickListener    (380)
145. android.widget.AdapterView    (376)
146. android.widget.EditText    (374)
147. android.database.Cursor    (374)
148. android.view.Menu    (374)
149. android.graphics.Bitmap    (372)
150. java.io.DataInputStream    (366)
151. java.io.DataOutputStream    (362)
152. java.util.zip.ZipEntry    (357)
153. android.widget.LinearLayout    (354)
154. javax.servlet.http.HttpServlet    (352)
155. java.text.DecimalFormat    (350)
156. java.util.concurrent.Callable    (350)
157. org.apache.commons.lang.StringUtils    (349)
158. java.io.FilenameFilter    (346)
159. java.util.GregorianCalendar    (346)
160. java.text.MessageFormat    (344)
161. java.awt.Color    (340)
162. android.view.KeyEvent    (337)
163. java.lang.annotation.Annotation    (336)
164. java.net.URLDecoder    (336)
165. java.util.concurrent.Future    (335)
166. android.graphics.drawable.Drawable    (332)
167. android.content.res.Resources    (331)
168. java.util.concurrent.atomic.AtomicBoolean    (329)
169. android.preference.PreferenceManager    (328)
170. android.widget.ArrayAdapter    (327)
171. android.view.MotionEvent    (326)
172. org.apache.commons.logging.Log    (325)
173. java.util.ResourceBundle    (324)
174. android.app.Dialog    (324)
175. org.apache.commons.logging.LogFactory    (321)
176. java.util.concurrent.ExecutionException    (320)
177. java.lang.ref.WeakReference    (320)
178. android.graphics.Canvas    (319)
179. java.sql.ResultSet    (319)
180. android.os.AsyncTask    (317)
181. org.apache.http.client.methods.HttpGet    (317)
182. java.sql.Connection    (317)
183. java.util.Queue    (315)
184. java.io.Closeable    (313)
185. android.content.ContentValues    (311)
186. java.util.ListIterator    (311)
187. android.content.BroadcastReceiver    (307)
188. org.apache.commons.io.IOUtils    (305)
189. android.content.pm.PackageManager    (301)
190. android.preference.PreferenceActivity    (299)
191. org.junit.AfterClass    (299)
192. android.os.Message    (296)
193. android.graphics.Color    (295)
194. java.net.ServerSocket    (295)
195. org.json.JSONObject    (294)
196. org.apache.http.client.HttpClient    (292)
197. java.util.TimerTask    (291)
198. java.util.concurrent.CountDownLatch    (289)
199. android.app.ProgressDialog    (287)
200. java.awt.event.ActionEvent    (287)
201. javax.servlet.ServletContext    (285)
202. android.view.Window    (285)
203. java.util.Timer    (285)
204. android.graphics.BitmapFactory    (281)
205. android.database.sqlite.SQLiteDatabase    (278)
206. java.awt.image.BufferedImage    (276)
207. android.os.IBinder    (276)
208. java.lang.reflect.Type    (275)
209. java.util.SortedSet    (274)
210. android.content.ComponentName    (273)
211. java.text.NumberFormat    (272)
212. android.app.PendingIntent    (271)
213. java.awt.event.ActionListener    (269)
214. org.osgi.framework.BundleContext    (269)
215. java.util.concurrent.LinkedBlockingQueue    (267)
216. java.util.concurrent.atomic.AtomicLong    (267)
217. android.text.TextUtils    (267)
218. org.json.JSONException    (265)
219. org.apache.commons.io.FileUtils    (264)
220. javax.servlet.ServletRequest    (263)
221. org.apache.http.HttpEntity    (263)
222. android.widget.BaseAdapter    (263)
223. android.os.Build    (263)
224. java.util.zip.GZIPInputStream    (260)
225. java.awt.Dimension    (259)
226. org.xml.sax.Attributes    (258)
227. android.widget.AdapterView.OnItemClickListener    (257)
228. android.os.Environment    (257)
229. java.util.concurrent.CopyOnWriteArrayList    (256)
230. java.io.FileFilter    (255)
231. javax.xml.transform.stream.StreamResult    (255)
232. android.app.Service    (253)
233. android.app.ListActivity    (252)
234. android.view.Gravity    (251)
235. javax.swing.JPanel    (251)
236. javax.swing.JFrame    (250)
237. javax.servlet.ServletResponse    (249)
238. android.database.sqlite.SQLiteOpenHelper    (249)
239. java.security.SecureRandom    (248)
240. android.graphics.Rect    (247)
241. junit.framework.Test    (246)
242. java.net.URLClassLoader    (245)
243. junit.framework.TestSuite    (245)
244. android.graphics.Paint    (245)
245. org.apache.http.client.methods.HttpPost    (244)
246. java.util.concurrent.BlockingQueue    (243)
247. java.util.concurrent.ConcurrentMap    (242)
248. javax.imageio.ImageIO    (241)
249. android.content.pm.PackageManager.NameNotFoundException    (241)
250. java.util.EnumSet    (238)
251. java.nio.channels.FileChannel    (236)
252. javax.xml.transform.TransformerFactory    (236)
253. java.util.concurrent.locks.ReentrantLock    (236)
254. android.view.WindowManager    (234)
255. android.content.ContentResolver    (234)
256. java.sql.PreparedStatement    (234)
257. org.json.JSONArray    (234)
258. javax.inject.Inject    (233)
259. android.content.IntentFilter    (233)
260. java.util.WeakHashMap    (233)
261. javax.swing.JLabel    (232)
262. java.net.SocketException    (232)
263. javax.xml.transform.Transformer    (231)
264. android.view.ContextMenu    (229)
265. javax.servlet.http.HttpSession    (228)
266. java.lang.reflect.Proxy    (228)
267. java.io.EOFException    (227)
268. java.sql.Statement    (226)
269. android.widget.ImageButton    (222)
270. java.io.RandomAccessFile    (220)
271. android.content.res.Configuration    (220)
272. javax.sql.DataSource    (219)
273. android.widget.CheckBox    (217)
274. com.google.common.collect.Lists    (216)
275. android.app.Application    (215)
276. org.xml.sax.helpers.DefaultHandler    (214)
277. java.util.concurrent.atomic.AtomicReference    (214)
278. javax.xml.transform.dom.DOMSource    (213)
279. javax.persistence.Entity    (213)
280. android.preference.Preference    (213)
281. android.app.Notification    (212)
282. org.codehaus.jackson.map.ObjectMapper    (212)
283. javax.swing.JOptionPane    (212)
284. android.os.SystemClock    (212)
285. org.springframework.beans.factory.annotation.Autowired    (211)
286. java.lang.reflect.InvocationHandler    (211)
287. javax.servlet.FilterChain    (210)
288. java.util.SortedMap    (209)
289. android.os.Parcelable    (207)
290. android.app.NotificationManager    (207)
291. org.springframework.context.ApplicationContext    (204)
292. javax.persistence.Id    (203)
293. android.view.MenuInflater    (203)
294. java.awt.BorderLayout    (203)
295. android.widget.ProgressBar    (202)
296. java.awt.event.MouseEvent    (202)
297. java.sql.DriverManager    (201)
298. org.apache.http.params.HttpParams    (201)
299. android.graphics.Typeface    (200)
300. java.util.jar.JarFile    (200)
301. java.util.concurrent.ThreadFactory    (199)
302. java.awt.Component    (196)
303. android.graphics.drawable.BitmapDrawable    (195)
304. java.util.concurrent.Executor    (194)
305. java.lang.reflect.ParameterizedType    (194)
306. javax.servlet.Filter    (192)
307. javax.servlet.FilterConfig    (192)
308. javax.swing.JButton    (192)
309. android.content.pm.PackageInfo    (191)
310. java.util.concurrent.TimeoutException    (190)
311. java.util.Scanner    (188)
312. org.apache.commons.codec.binary.Base64    (188)
313. android.widget.FrameLayout    (188)
314. java.util.jar.JarEntry    (187)
315. java.util.zip.ZipFile    (187)
316. java.awt.Graphics2D    (186)
317. java.awt.Font    (186)
318. java.awt.Graphics    (185)
319. java.lang.ref.SoftReference    (185)
320. java.security.cert.X509Certificate    (184)
321. java.security.Principal    (184)
322. javax.naming.NamingException    (184)
323. android.webkit.WebView    (183)
324. android.view.animation.Animation    (183)
325. android.content.res.TypedArray    (181)
326. java.util.concurrent.locks.Lock    (181)
327. javax.xml.parsers.SAXParserFactory    (181)
328. javax.swing.JScrollPane    (181)
329. org.testng.annotations.Test    (180)
330. java.util.concurrent.ScheduledExecutorService    (179)
331. java.util.MissingResourceException    (178)
332. android.view.ContextMenu.ContextMenuInfo    (178)
333. javax.xml.transform.TransformerException    (178)
334. com.google.common.collect.Maps    (178)
335. android.content.ActivityNotFoundException    (177)
336. android.widget.CompoundButton    (177)
337. android.os.Parcel    (176)
338. javax.net.ssl.SSLContext    (175)
339. android.view.animation.AnimationUtils    (174)
340. org.apache.http.Header    (174)
341. android.content.pm.ResolveInfo    (172)
342. java.security.cert.CertificateException    (171)
343. java.sql.Timestamp    (171)
344. java.security.AccessController    (171)
345. java.awt.event.WindowEvent    (171)
346. android.content.SharedPreferences.Editor    (170)
347. java.awt.event.KeyEvent    (169)
348. android.graphics.RectF    (169)
349. android.view.ViewGroup.LayoutParams    (169)
350. org.w3c.dom.NamedNodeMap    (169)
351. java.lang.management.ManagementFactory    (168)
352. org.xmlpull.v1.XmlPullParserException    (168)
353. javax.servlet.http.Cookie    (168)
354. android.os.Looper    (166)
355. org.xmlpull.v1.XmlPullParser    (166)
356. java.util.concurrent.locks.ReentrantReadWriteLock    (166)
357. javax.xml.bind.annotation.XmlRootElement    (166)
358. java.util.concurrent.ConcurrentLinkedQueue    (164)
359. android.widget.ListAdapter    (164)
360. javax.swing.JTextField    (164)
361. java.util.BitSet    (163)
362. javax.xml.parsers.SAXParser    (163)
363. java.util.concurrent.ThreadPoolExecutor    (163)
364. javax.servlet.ServletConfig    (163)
365. java.util.zip.ZipInputStream    (162)
366. android.net.ConnectivityManager    (162)
367. java.beans.PropertyChangeListener    (161)
368. org.osgi.framework.Bundle    (159)
369. javax.naming.InitialContext    (159)
370. java.awt.Image    (158)
371. org.apache.http.params.BasicHttpParams    (158)
372. javax.persistence.EntityManager    (158)
373. java.util.zip.ZipOutputStream    (157)
374. java.security.PrivilegedAction    (157)
375. java.nio.CharBuffer    (157)
376. javax.swing.ImageIcon    (157)
377. java.beans.PropertyDescriptor    (157)
378. javax.xml.bind.JAXBContext    (153)
379. com.google.common.base.Function    (153)
380. javax.management.ObjectName    (153)
381. org.apache.http.client.ClientProtocolException    (152)
382. android.widget.Spinner    (152)
383. android.content.DialogInterface.OnClickListener    (152)
384. javax.persistence.GeneratedValue    (151)
385. javax.swing.SwingUtilities    (151)
386. javax.xml.namespace.QName    (151)
387. android.os.RemoteException    (150)
388. org.eclipse.swt.SWT    (150)
389. android.text.Editable    (150)
390. org.eclipse.swt.widgets.Composite    (149)
391. org.mockito.Mockito    (149)
392. org.springframework.core.io.Resource    (149)
393. android.content.ContentProvider    (149)
394. android.graphics.Matrix    (149)
395. android.widget.RelativeLayout    (148)
396. javax.servlet.ServletOutputStream    (148)
397. com.google.common.collect.Sets    (147)
398. org.apache.http.message.BasicNameValuePair    (147)
399. java.util.EventListener    (147)
400. javax.xml.transform.OutputKeys    (146)
401. java.awt.Point    (146)
402. java.beans.PropertyChangeEvent    (146)
403. android.provider.BaseColumns    (145)
404. javax.swing.JComponent    (145)
405. org.apache.http.NameValuePair    (144)
406. javax.swing.BorderFactory    (144)
407. org.joda.time.DateTime    (144)
408. javax.persistence.Column    (144)
409. javax.ws.rs.Path    (143)
410. org.apache.http.util.EntityUtils    (143)
411. java.io.DataInput    (143)
412. javax.annotation.PostConstruct    (143)
413. org.xml.sax.XMLReader    (143)
414. org.apache.http.params.HttpConnectionParams    (142)
415. org.junit.Rule    (142)
416. org.apache.commons.httpclient.HttpClient    (142)
417. javax.xml.bind.annotation.XmlElement    (142)
418. android.util.DisplayMetrics    (141)
419. javax.xml.transform.stream.StreamSource    (141)
420. android.media.AudioManager    (140)
421. android.content.pm.ActivityInfo    (140)
422. org.eclipse.ui.plugin.AbstractUIPlugin    (139)
423. com.google.inject.Inject    (139)
424. java.security.KeyStore    (139)
425. org.springframework.test.context.ContextConfiguration    (139)
426. com.google.common.base.Preconditions    (139)
427. javax.net.ssl.TrustManager    (139)
428. javax.naming.Context    (138)
429. org.apache.hadoop.conf.Configuration    (138)
430. java.io.FilterInputStream    (138)
431. org.osgi.framework.BundleActivator    (138)
432. android.view.ViewConfiguration    (138)
433. android.database.SQLException    (138)
434. javax.servlet.ServletContextEvent    (138)
435. android.util.TypedValue    (138)
436. javax.ws.rs.GET    (137)
437. android.content.ContentUris    (137)
438. java.awt.Rectangle    (137)
439. org.springframework.context.support.ClassPathXmlApplicationContext    (137)
440. org.apache.http.conn.scheme.Scheme    (136)
441. org.apache.log4j.Level    (135)
442. org.eclipse.swt.layout.GridData    (135)
443. javax.swing.JTextArea    (135)
444. org.apache.http.client.entity.UrlEncodedFormEntity    (135)
445. org.eclipse.core.runtime.IProgressMonitor    (135)
446. android.text.TextWatcher    (135)
447. java.net.SocketTimeoutException    (134)
448. org.eclipse.swt.widgets.Display    (134)
449. java.util.zip.GZIPOutputStream    (134)
450. java.util.EventObject    (134)
451. android.text.Html    (134)
452. javax.net.ssl.X509TrustManager    (133)
453. javax.ws.rs.core.MediaType    (133)
454. org.eclipse.core.runtime.CoreException    (133)
455. android.content.ServiceConnection    (132)
456. com.google.common.base.Predicate    (132)
457. javax.crypto.spec.SecretKeySpec    (132)
458. java.util.concurrent.ArrayBlockingQueue    (132)
459. javax.swing.JFileChooser    (131)
460. org.apache.http.HttpStatus    (131)
461. org.xml.sax.SAXParseException    (130)
462. java.awt.Insets    (130)
463. android.os.PowerManager    (130)
464. javax.ws.rs.Produces    (130)
465. javax.management.MBeanServer    (129)
466. javax.swing.UIManager    (129)
467. org.eclipse.swt.layout.GridLayout    (129)
468. java.io.DataOutput    (128)
469. org.eclipse.swt.widgets.Label    (128)
470. org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager    (128)
471. org.apache.http.protocol.HttpContext    (128)
472. java.nio.ByteOrder    (128)
473. javax.crypto.Cipher    (128)
474. java.awt.Toolkit    (128)
475. android.net.NetworkInfo    (127)
476. java.awt.event.WindowAdapter    (127)
477. com.google.inject.Injector    (127)
478. org.apache.http.conn.scheme.SchemeRegistry    (126)
479. org.eclipse.swt.events.SelectionEvent    (126)
480. android.content.UriMatcher    (126)
481. org.springframework.beans.factory.InitializingBean    (125)
482. android.widget.AbsListView    (125)
483. java.awt.event.MouseAdapter    (125)
484. android.view.inputmethod.InputMethodManager    (125)
485. org.eclipse.core.runtime.IStatus    (124)
486. javax.xml.bind.JAXBException    (124)
487. org.mockito.Mock    (124)
488. java.net.ConnectException    (123)
489. org.osgi.framework.ServiceReference    (123)
490. android.support.v4.app.Fragment    (123)
491. java.beans.Introspector    (123)
492. org.springframework.stereotype.Controller    (123)
493. javax.xml.transform.Source    (123)
494. android.preference.ListPreference    (123)
495. javax.swing.JMenuItem    (123)
496. org.eclipse.core.runtime.Status    (123)
497. android.content.pm.ApplicationInfo    (123)
498. javax.xml.xpath.XPathFactory    (122)
499. java.awt.Container    (122)
500. com.google.gson.Gson    (122)
501. org.eclipse.ui.PlatformUI    (121)
502. javax.swing.JComboBox    (121)
503. java.util.concurrent.Semaphore    (121)
504. org.eclipse.jface.resource.ImageDescriptor    (121)
505. java.net.SocketAddress    (121)
506. org.eclipse.jetty.server.Server    (121)
507. org.eclipse.swt.graphics.Image    (121)
508. java.util.logging.LogRecord    (121)
509. com.google.inject.AbstractModule    (121)
510. org.eclipse.swt.widgets.Button    (121)
511. org.eclipse.swt.widgets.Text    (121)
512. com.google.common.collect.ImmutableList    (121)
513. org.springframework.util.Assert    (121)
514. javax.servlet.ServletContextListener    (120)
515. org.springframework.util.StringUtils    (120)
516. org.apache.http.client.methods.HttpUriRequest    (120)
517. android.util.Xml    (120)
518. java.util.EnumMap    (120)
519. org.eclipse.ui.IWorkbench    (119)
520. org.eclipse.swt.widgets.Shell    (119)
521. android.widget.RemoteViews    (118)
522. javax.xml.xpath.XPathConstants    (118)
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996. org.xmlpull.v1.XmlSerializer    (65)
997. java.util.concurrent.CancellationException    (64)
998. org.apache.lucene.analysis.Analyzer    (64)
999. com.google.inject.name.Names    (64)
1000. java.nio.channels.ReadableByteChannel    (64)

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