diff --git a/.gitignore b/.gitignore
index e43b0f98..0a353997 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,14 @@
 .DS_Store
+
+# idea
+code/.idea
+code/build
+*.jar
+*.log
+*.class
+*.war
+code/logs
+
+# gradle
+code/.gradle
+!code/gradle/wrapper/gradle-wrapper.jar
\ No newline at end of file
diff --git a/code/build.gradle b/code/build.gradle
new file mode 100644
index 00000000..467c1adb
--- /dev/null
+++ b/code/build.gradle
@@ -0,0 +1,43 @@
+plugins {
+    id 'java'
+}
+
+group 'xraorao'
+version '1.0-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+    maven {
+        //url 'https://mvnrepository.com/artifact/org.apache.storm/storm-core'
+        url 'http://clojars.org/repo/'
+    }
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+
+    // https://mvnrepository.com/artifact/org.apache.storm/storm-core
+    compile  group: 'org.apache.storm', name: 'storm-core', version: '1.1.1'
+
+    //compile  group: 'org.apache.storm', name: 'storm-kafka', version: '1.1.1'
+    compile 'com.google.guava:guava:25.1-jre'
+
+    // https://mvnrepository.com/artifact/org.apache.commons/commons-collections4
+    compile group: 'org.apache.commons', name: 'commons-collections4', version: '4.0'
+
+}
+
+jar {
+    manifest {
+        attributes 'Implementation-Title': 'License',
+                'Implementation-Version': version
+        attributes "Class-Path": configurations.compile.collect { it.getName() }.join(' dependencies/')
+    }
+}
+
+task copyJar(type: Copy){
+    from configurations.runtime
+    into ('build/libs/dependencies')
+}
diff --git a/code/gradle/wrapper/gradle-wrapper.jar b/code/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 00000000..01b8bf6b
Binary files /dev/null and b/code/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/code/gradle/wrapper/gradle-wrapper.properties b/code/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..120d4991
--- /dev/null
+++ b/code/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sun Jul 29 11:55:40 CST 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
diff --git a/code/gradlew b/code/gradlew
new file mode 100644
index 00000000..cccdd3d5
--- /dev/null
+++ b/code/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/code/gradlew.bat b/code/gradlew.bat
new file mode 100644
index 00000000..f9553162
--- /dev/null
+++ b/code/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/code/settings.gradle b/code/settings.gradle
new file mode 100644
index 00000000..5fdf5bd0
--- /dev/null
+++ b/code/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'interview'
+
diff --git a/code/src/main/java/com/raorao/storm/WordCount.java b/code/src/main/java/com/raorao/storm/WordCount.java
new file mode 100644
index 00000000..b366b433
--- /dev/null
+++ b/code/src/main/java/com/raorao/storm/WordCount.java
@@ -0,0 +1,97 @@
+package com.raorao.storm;
+
+import com.raorao.storm.spout.RandomSentenceSpout;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.storm.Config;
+import org.apache.storm.LocalCluster;
+import org.apache.storm.StormSubmitter;
+import org.apache.storm.topology.BasicOutputCollector;
+import org.apache.storm.topology.OutputFieldsDeclarer;
+import org.apache.storm.topology.TopologyBuilder;
+import org.apache.storm.topology.base.BaseBasicBolt;
+import org.apache.storm.tuple.Fields;
+import org.apache.storm.tuple.Tuple;
+import org.apache.storm.tuple.Values;
+
+/**
+ * 单词计数.
+ *
+ * @author Xiong Raorao
+ * @since 2018-07-29-15:35
+ */
+public class WordCount {
+
+  public static void main(String[] args) throws Exception {
+
+    TopologyBuilder builder = new TopologyBuilder();
+
+    builder.setSpout("spout", new RandomSentenceSpout(), 5);
+
+    builder.setBolt("split", new SplitSentence(), 8).shuffleGrouping("spout");
+    builder.setBolt("count", new WordCountBolt(), 12).fieldsGrouping("split", new Fields("word"));
+
+    Config conf = new Config();
+    conf.setDebug(true);
+
+    if (args != null && args.length > 0) {
+      conf.setNumWorkers(3);
+
+      StormSubmitter.submitTopologyWithProgressBar(args[0], conf, builder.createTopology());
+    } else {
+      conf.setMaxTaskParallelism(3);
+
+      LocalCluster cluster = new LocalCluster();
+      cluster.submitTopology("word-count", conf, builder.createTopology());
+
+      Thread.sleep(10000);
+
+      cluster.shutdown();
+    }
+  }
+
+  public static class SplitSentence extends BaseBasicBolt {
+
+    public SplitSentence() {
+
+    }
+
+    @Override
+    public void execute(Tuple input, BasicOutputCollector collector) {
+      String sentence = input.getString(0);
+      String[] words = sentence.split(" ");
+      for (String word : words) {
+        collector.emit(new Values(word));
+      }
+    }
+
+    @Override
+    public void declareOutputFields(OutputFieldsDeclarer declarer) {
+      declarer.declare(new Fields("word"));
+    }
+
+  }
+
+  public static class WordCountBolt extends BaseBasicBolt {
+
+    Map<String, Integer> counts = new HashMap<String, Integer>();
+
+    @Override
+    public void execute(Tuple tuple, BasicOutputCollector collector) {
+      String word = tuple.getString(0);
+      Integer count = counts.get(word);
+      if (count == null) {
+        count = 0;
+      }
+      count++;
+      counts.put(word, count);
+      collector.emit(new Values(word, count));
+    }
+
+    @Override
+    public void declareOutputFields(OutputFieldsDeclarer declarer) {
+      declarer.declare(new Fields("word", "count"));
+    }
+  }
+
+}
diff --git a/code/src/main/java/com/raorao/storm/spout/RandomSentenceSpout.java b/code/src/main/java/com/raorao/storm/spout/RandomSentenceSpout.java
new file mode 100644
index 00000000..cff43471
--- /dev/null
+++ b/code/src/main/java/com/raorao/storm/spout/RandomSentenceSpout.java
@@ -0,0 +1,80 @@
+package com.raorao.storm.spout;
+
+import org.apache.storm.spout.SpoutOutputCollector;
+import org.apache.storm.task.TopologyContext;
+import org.apache.storm.topology.OutputFieldsDeclarer;
+import org.apache.storm.topology.base.BaseRichSpout;
+import org.apache.storm.tuple.Fields;
+import org.apache.storm.tuple.Values;
+import org.apache.storm.utils.Utils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Map;
+import java.util.Random;
+
+public class RandomSentenceSpout extends BaseRichSpout {
+  private static final Logger LOG = LoggerFactory.getLogger(RandomSentenceSpout.class);
+
+  SpoutOutputCollector _collector;
+  Random _rand;
+
+
+  @Override
+  public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
+    _collector = collector;
+    _rand = new Random();
+  }
+
+  @Override
+  public void nextTuple() {
+    Utils.sleep(100);
+    String[] sentences = new String[]{sentence("the cow jumped over the moon"), sentence("an apple a day keeps the doctor away"),
+        sentence("four score and seven years ago"), sentence("snow white and the seven dwarfs"), sentence("i am at two with nature")};
+    final String sentence = sentences[_rand.nextInt(sentences.length)];
+
+    LOG.debug("Emitting tuple: {}", sentence);
+
+    _collector.emit(new Values(sentence));
+  }
+
+  protected String sentence(String input) {
+    return input;
+  }
+
+  @Override
+  public void ack(Object id) {
+  }
+
+  @Override
+  public void fail(Object id) {
+  }
+
+  @Override
+  public void declareOutputFields(OutputFieldsDeclarer declarer) {
+    declarer.declare(new Fields("word"));
+  }
+
+  // Add unique identifier to each tuple, which is helpful for debugging
+  public static class TimeStamped extends RandomSentenceSpout {
+    private final String prefix;
+
+    public TimeStamped() {
+      this("");
+    }
+
+    public TimeStamped(String prefix) {
+      this.prefix = prefix;
+    }
+
+    protected String sentence(String input) {
+      return prefix + currentDate() + " " + input;
+    }
+
+    private String currentDate() {
+      return new SimpleDateFormat("yyyy.MM.dd_HH:mm:ss.SSSSSSSSS").format(new Date());
+    }
+  }
+}
\ No newline at end of file