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:
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