Most Popular APIs
42K java.util.Collections 3,10,17,18,24,25,27,29,31,32,33,37,99,105,108,112,121,132,141,143,148,217,237,247,260,282,289,297,312,328,346,356,364,378,407,422,450,491,513,548,613,672,722,747,777,799,879,957,1009,1056,1079,1162,1203,1315,1377,1406,1456,1799,1903,2046,2137,2238,2404,2552,2677,2748,2942,3399,3579,3734,3937,4153,4339,4494,4785,4942,5160,5391,5638,5892,6178,6593,6794,7263,7635,8075,8333,8753,9017,9339,9617,10039,10556,11035,11595,12058,13067,13703,14205,14635,15466,16633,17145,17497,18181,18594,19097,19413,20204,20861,21595,22296,23193,23806,24765,25984,27307,27863,28740,29233,29674,30407,31034,31811,32442,34789,36167,36741,37879,38872,39454,39942,40702,41203,41834,41903,41991,42000
40K java.util.Collection 1,8,9,11,15,17,19,21,22,25,225,230,248,255,283,309,337,343,351,480,508,523,535,573,598,621,656,671,706,720,726,743,781,794,831,871,884,913,981,1066,1186,1219,1256,1266,1351,1473,1604,1677,1723,1826,1879,1984,2040,2151,2225,2602,2709,2880,2940,3027,3204,3365,3521,3614,3778,4506,4760,5019,5263,5416,5637,5804,6153,6454,6736,6954,7279,7574,8048,8517,8835,9296,9532,9994,10303,10634,10890,11193,11490,11977,12385,12932,13713,14151,15086,15693,16179,16493,17272,18507,18931,19243,19722,20140,20559,20910,21521,22273,22613,23232,23945,24552,25418,26639,27569,28083,28794,29349,29950,30782,31593,32393,32902,35281,35964,36489,37195,37854,38332,38745,39532,39882,40324,40358,40461,40469
33K java.util.Iterator 10,11,26,48,51,65,69,77,112,145,149,151,158,159,161,176,179,633,672,720,746,759,775,804,809,813,1075,1106,1120,1134,1168,1189,1197,1216,1269,1302,1318,1333,1344,1372,1391,1411,1440,1452,1467,1562,1823,2081,2136,2244,2268,2380,2427,2477,2510,2551,2599,2621,2731,2845,2907,2999,3640,3707,3888,3978,4059,4331,4503,4616,4804,4960,5254,5431,5487,5664,5854,6146,6385,6725,7013,7292,7472,7759,7978,8285,8890,9031,9573,9781,9980,10217,10457,10688,10907,11072,11421,11634,11932,12247,12624,13293,13738,13965,14243,14906,16439,16768,17126,17599,18033,18336,18533,19038,19520,20311,20778,21256,21728,22100,23381,24349,24716,25357,25708,26215,26720,27326,27826,28186,30539,31189,31600,31970,32400,32801,33040,33358,33535,33860,33902,33935,33939
33K java.io.Serializable 4,7,11,22,23,53,66,67,70,73,78,88,107,109,110,116,123,126,139,149,155,161,164,167,175,178,182,185,188,197,200,201,202,211,214,225,227,233,239,241,244,264,728,1195,1199,1229,1232,1250,1254,1265,1288,1294,1306,1331,1349,1364,1389,1449,2179,2277,2443,2471,2493,2587,2686,2721,2757,2836,2905,2965,3072,3304,3439,3778,3973,4200,4296,4619,4705,5025,5202,5405,6508,6575,6762,6937,7028,7243,7431,7730,7839,8044,8534,8682,8962,9174,9334,10039,10490,10659,10810,11348,11791,12068,12242,12725,12850,12976,13116,13431,13709,16074,16506,16881,17255,17608,18436,19537,19832,20283,20732,21020,21498,22106,22508,22747,25340,26349,26513,29272,32183,32664,32874,33193,33382,33745,33754,33798
30K java.util.HashSet 2,4,5,6,15,23,24,29,72,181,193,207,226,249,264,278,281,292,425,443,460,471,485,497,518,533,546,553,564,570,578,594,603,621,656,672,688,727,872,1032,1064,1146,1166,1225,1273,1340,1379,1417,1464,1490,1578,1617,1674,1792,2259,2332,2450,2508,2562,2741,2877,2979,3043,3155,3461,3546,3620,3779,3863,4086,4320,4646,4816,5077,5226,5435,5641,5856,6356,6527,6915,7141,7446,7704,7916,8161,8355,8538,8928,9178,9575,9898,10214,10791,11261,11525,11782,12371,13527,13834,14132,14640,14904,15278,15537,16081,16549,16928,17422,18027,18350,18888,20399,21607,21942,22452,22726,23107,23649,24151,24701,25079,27070,27743,28179,28627,29055,29395,29711,29947,30239,30752,30773,30816,30817
26K org.jetbrains.annotations.Nullable 111,194,287,297,371,593,679,759,861,966,1065,1134,1235,1296,1425,1489,1568,1644,1755,1875,2017,2114,2195,2283,2452,2586,2725,2824,2902,2945,3433,3894,4226,4545,4767,5133,5185,5272,5368,5453,5552,5673,5713,5778,5819,5917,5985,6096,6196,6268,6383,9139,9494,9575,9672,9714,9778,9872,9959,10108,10212,10349,10529,10637,10810,11099,11217,11316,11435,11565,11747,11982,12142,12303,12446,12771,13442,13639,14075,14234,14459,14909,15161,15346,15621,15890,16162,16598,16804,17171,17441,17632,17781,18066,18245,18481,19033,19364,19694,20059,20603,20869,21156,21384,21499,21897,22238,22471,23133,23321,23579,23834,24129,24343,24603,24799,25883,26114,26207,26209
25K junit.framework.TestCase 5,6,12,14,15,16,19,27,30,36,39,90,151,157,166,213,245,283,288,301,321,377,409,502,506,512,525,549,556,561,600,643,653,661,721,733,741,752,767,777,792,804,818,869,897,904,1042,1054,1078,1213,1262,1285,1319,1547,1605,1671,1749,1785,1856,1902,1936,1949,1996,2092,2240,2278,3452,3745,4318,4418,4452,4816,4944,5002,5068,5185,5321,5447,5490,5866,5993,6221,6550,6735,6835,6964,7066,7300,7501,7562,7775,7821,8479,8521,8710,8806,8863,9168,9325,9787,10066,10312,11099,11248,11437,12096,12328,12490,12572,12845,15346,15433,15633,15885,15964,16145,16257,16406,16601,17340,18246,18520,19022,19328,19777,20135,20267,20440,20535,20628,20792,20879,21005,21102,23013,23520,23625,23819,24703,24809,24863,24983,25088,25299,25318,25353,25354
24K java.io.InputStream 1,4,5,11,12,16,17,18,22,24,26,29,78,82,93,94,101,108,113,116,137,141,147,149,158,160,163,168,171,178,184,190,199,204,211,230,235,246,255,297,328,354,373,383,425,436,461,476,486,524,533,590,613,663,673,1069,1146,1295,1371,1424,1645,1735,1920,2037,2216,2388,2597,2777,3149,3388,3477,3645,3933,4035,4227,4400,4622,4820,5116,5460,5689,6182,6887,7176,7491,7709,7915,8104,8426,8588,8751,9089,9498,9835,10361,10690,10910,11132,11542,12506,12861,13079,13506,13777,14106,14351,14755,15282,15654,16040,16419,16605,16988,17545,18040,18298,18594,18836,19101,19444,19767,20227,20605,21785,22156,22380,22768,23207,23481,23715,23886,24040,24170,24197,24226
22K android.content.Context 1,2,5,14,33,35,437,466,664,692,720,1364,1428,1486,1783,1833,1884,1921,1963,2108,2179,2291,2384,2488,2546,2764,2859,3009,3146,3240,3318,3408,3489,3662,3766,3863,3927,4051,4183,4421,4550,4768,4901,5040,5466,5860,6060,6300,6478,6760,6960,7444,7715,8087,8567,8841,9064,9554,10017,10381,10737,11170,11512,11907,12282,12727,13018,13513,13768,14144,14480,14889,15248,15700,16381,17270,18826,19852,20571,21759,22114,22398,22560,22720,22747,22766,22770
22K org.junit.Before 25,26,32,64,67,69,75,86,120,129,164,173,198,209,225,303,379,403,409,426,436,458,485,516,542,634,696,945,1031,1158,1258,1315,1384,1488,1572,1875,1925,1971,2051,2127,2168,2239,2349,2384,2425,2535,2608,2688,2905,3016,3168,3426,3599,4043,4248,4557,4645,4761,4876,5031,5141,5346,5536,5872,6554,6884,7125,7286,7653,7974,8113,8314,8555,8882,9077,9292,9607,9893,10183,10709,11189,11474,11986,12380,13250,13617,14301,14726,15250,15862,16227,17608,18019,18508,19115,19615,20031,20284,20603,20810,21310,21614,21993,22088,22215,22245