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)

523.org.apache.http.HttpHost (118)

524.org.springframework.web.bind.annotation.RequestMapping (118)

525.com.google.inject.Guice (117)

526.org.apache.commons.cli.CommandLine (117)

527.org.apache.maven.project.MavenProject (117)

528.android.content.SharedPreferences.OnSharedPreferenceChangeListener (117)

529.com.google.common.collect.ImmutableMap (117)

530.org.apache.maven.plugin.MojoExecutionException (117)

531.android.app.SearchManager (116)

532.org.springframework.beans.BeansException (116)

533.android.location.Location (116)

534.java.sql.Types (116)

535.android.widget.SeekBar (116)

536.com.google.common.collect.Iterables (116)

537.javax.xml.xpath.XPath (115)

538.java.security.InvalidKeyException (115)

539.org.apache.maven.plugin.AbstractMojo (115)

540.org.eclipse.swt.widgets.Control (115)

541.javax.inject.Named (115)

542.javax.xml.bind.Unmarshaller (115)

543.org.apache.hadoop.fs.Path (114)

544.org.apache.commons.cli.Options (114)

545.org.eclipse.jface.dialogs.MessageDialog (114)

546.javax.ws.rs.core.Response (114)

547.org.apache.http.conn.scheme.PlainSocketFactory (114)

548.org.eclipse.swt.events.SelectionAdapter (114)

549.javax.mail.internet.MimeMessage (113)

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1000.java.nio.channels.ReadableByteChannel (64)