使用次数最多的Java API排行

programtalk网站列出了最流行的Java API排行，也就是使用最多的Java API从多到少排列，看看你是否熟悉？也许可以拾遗补漏：

右边括弧中是使用次数：

java.io.File (36721)
java.io.InputStream (13582)
java.util.List (9322)
java.io.ByteArrayOutputStream (8886)
android.view.View (8515)
android.content.Intent (8289)
java.nio.ByteBuffer (8029)
java.util.Iterator (7720)
java.sql.Connection (7024)
java.lang.reflect.Method (7002)
java.util.Properties (6920)
java.util.Date (6743)
java.util.ArrayList (6625)
java.net.URL (6458)
java.sql.Statement (5287)
java.sql.ResultSet (5235)
org.apache.hadoop.conf.Configuration (4803)
org.apache.hadoop.fs.Path (4656)
java.util.concurrent.CountDownLatch (4587)
java.util.regex.Matcher (4567)
java.util.Map (4542)
java.util.Calendar (4475)
java.nio.file.Path (4454)
java.util.Random (4337)
com.intellij.openapi.vfs.VirtualFile (4191)
java.io.BufferedReader (4151)
java.net.URI (4146)
javax.persistence.EntityManager (3972)
android.os.Bundle (3927)
java.io.StringWriter (3785)
org.w3c.dom.Element (3761)
java.sql.PreparedStatement (3751)
java.lang.reflect.Field (3573)
org.json.JSONObject (3470)
org.apache.camel.component.mock.MockEndpoint (3432)
org.w3c.dom.Document (3413)
javax.persistence.Query (3397)
com.fasterxml.jackson.core.JsonToken (3336)
java.io.OutputStream (3294)
android.database.Cursor (3279)
java.util.HashMap (3135)
java.io.PrintWriter (3073)
javax.jcr.Node (3035)
com.intellij.openapi.project.Project (3001)
java.math.BigDecimal (2836)
java.io.ByteArrayInputStream (2831)
java.awt.image.BufferedImage (2778)
android.widget.TextView (2722)
java.math.BigInteger (2698)
java.util.concurrent.atomic.AtomicInteger (2600)
java.util.UUID (2544)
org.apache.hadoop.fs.FileSystem (2521)
java.util.regex.Pattern (2505)
com.intellij.psi.PsiElement (2421)
android.content.SharedPreferences (2375)
android.graphics.Bitmap (2332)
java.io.FileOutputStream (2317)
org.w3c.dom.Node (2280)
org.w3c.dom.NodeList (2256)
java.util.Locale (2249)
javax.servlet.http.HttpServletRequest (2141)
org.alfresco.service.cmr.repository.NodeRef (2095)
org.joda.time.DateTime (2020)
java.util.concurrent.ExecutorService (1987)
java.text.SimpleDateFormat (1953)
java.util.Set (1945)
org.camunda.bpm.engine.runtime.ProcessInstance (1923)
org.apache.camel.Exchange (1911)
java.util.concurrent.atomic.AtomicBoolean (1878)

每个API详解案例见原文：
Popular Java API examples