diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 977748d..02c16e1 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,10 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="8ccbe0a5-cdf8-4091-a84b-916013277899" name="Default" comment="补全注释">
+    <list default="true" id="8ccbe0a5-cdf8-4091-a84b-916013277899" name="Default" comment="">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
       <change beforePath="$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java" afterPath="$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java" afterPath="$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java" />
     </list>
     <ignored path="$PROJECT_DIR$/out/" />
     <ignored path="$PROJECT_DIR$/target/" />
@@ -27,25 +26,23 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="HDFSApp.java" pinned="false" current-in-tab="true">
+      <file leaf-file-name="HDFSApp.java" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="437">
+            <state relative-caret-position="161">
               <caret line="19" column="25" lean-forward="false" selection-start-line="19" selection-start-column="25" selection-end-line="19" selection-end-column="25" />
               <folding>
                 <element signature="imports" expanded="true" />
-                <element signature="e#2451#2611#0" expanded="true" />
-                <element signature="e#2610#2611#0" expanded="true" />
               </folding>
             </state>
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="WordCountApp.java" pinned="false" current-in-tab="false">
+      <file leaf-file-name="WordCountApp.java" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="391">
-              <caret line="17" column="19" lean-forward="false" selection-start-line="17" selection-start-column="19" selection-end-line="17" selection-end-column="19" />
+            <state relative-caret-position="437">
+              <caret line="95" column="68" lean-forward="false" selection-start-line="95" selection-start-column="68" selection-end-line="95" selection-end-column="68" />
               <folding>
                 <element signature="imports" expanded="true" />
               </folding>
@@ -53,12 +50,44 @@
           </provider>
         </entry>
       </file>
+      <file leaf-file-name="Reducer.class" pinned="false" current-in-tab="false">
+        <entry file="jar://$MAVEN_REPOSITORY$/org/apache/hadoop/hadoop-mapreduce-client-core/2.6.0-cdh5.7.0/hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar!/org/apache/hadoop/mapreduce/Reducer.class">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="207">
+              <caret line="17" column="13" lean-forward="false" selection-start-line="17" selection-start-column="13" selection-end-line="17" selection-end-column="13" />
+              <folding>
+                <marker date="1521904733592" expanded="false" signature="0:104" ph="/.../" />
+                <marker date="1521904733592" expanded="false" signature="151:462" ph="..." />
+                <marker date="1521904733592" expanded="true" signature="464:495" ph="@{...}" />
+                <marker date="1521904733592" expanded="true" signature="574:581" ph="{}" />
+                <marker date="1521904733592" expanded="true" signature="708:715" ph="{}" />
+                <marker date="1521904733592" expanded="true" signature="880:1048" ph="{...}" />
+                <marker date="1521904733592" expanded="true" signature="1177:1184" ph="{}" />
+                <marker date="1521904733592" expanded="true" signature="1306:1766" ph="{...}" />
+                <marker date="1521904733592" expanded="true" signature="1861:1905" ph="{...}" />
+                <marker date="1521904733592" expanded="true" signature="1888:1899" ph="{}" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file leaf-file-name="Mapper.class" pinned="false" current-in-tab="false">
         <entry file="jar://$MAVEN_REPOSITORY$/org/apache/hadoop/hadoop-mapreduce-client-core/2.6.0-cdh5.7.0/hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar!/org/apache/hadoop/mapreduce/Mapper.class">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="198">
-              <caret line="20" column="19" lean-forward="false" selection-start-line="20" selection-start-column="19" selection-end-line="20" selection-end-column="19" />
-              <folding />
+            <state relative-caret-position="184">
+              <caret line="13" column="13" lean-forward="false" selection-start-line="13" selection-start-column="13" selection-end-line="13" selection-end-column="13" />
+              <folding>
+                <marker date="1521904733592" expanded="false" signature="0:104" ph="/.../" />
+                <marker date="1521904733592" expanded="false" signature="151:304" ph="..." />
+                <marker date="1521904733592" expanded="true" signature="306:321" ph="@{...}" />
+                <marker date="1521904733592" expanded="true" signature="398:405" ph="{}" />
+                <marker date="1521904733592" expanded="true" signature="531:538" ph="{}" />
+                <marker date="1521904733592" expanded="true" signature="688:730" ph="{...}" />
+                <marker date="1521904733592" expanded="true" signature="858:865" ph="{}" />
+                <marker date="1521904733592" expanded="true" signature="986:1248" ph="{...}" />
+                <marker date="1521904733592" expanded="true" signature="1340:1384" ph="{...}" />
+                <marker date="1521904733592" expanded="true" signature="1367:1378" ph="{}" />
+              </folding>
             </state>
           </provider>
         </entry>
@@ -67,7 +96,7 @@
         <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/AppTest.java">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="115">
-              <caret line="7" column="28" lean-forward="true" selection-start-line="7" selection-start-column="28" selection-end-line="7" selection-end-column="28" />
+              <caret line="7" column="28" lean-forward="false" selection-start-line="7" selection-start-column="28" selection-end-line="7" selection-end-column="28" />
               <folding />
             </state>
           </provider>
@@ -94,8 +123,8 @@
     <option name="CHANGED_PATHS">
       <list>
         <option value="$PROJECT_DIR$/pom.xml" />
-        <option value="$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java" />
         <option value="$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java" />
+        <option value="$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java" />
       </list>
     </option>
   </component>
@@ -141,9 +170,10 @@
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
-      <pane id="AndroidView" />
-      <pane id="Scratches" />
       <pane id="Scope" />
+      <pane id="PackagesPane" />
+      <pane id="Scratches" />
+      <pane id="AndroidView" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
@@ -206,7 +236,6 @@
           <select />
         </subPane>
       </pane>
-      <pane id="PackagesPane" />
     </panes>
   </component>
   <component name="PropertiesComponent">
@@ -475,7 +504,8 @@
       <workItem from="1523148734020" duration="6470000" />
       <workItem from="1523322335998" duration="659000" />
       <workItem from="1523606327796" duration="135000" />
-      <workItem from="1523931905005" duration="4695000" />
+      <workItem from="1523931905005" duration="6215000" />
+      <workItem from="1524056118416" duration="1130000" />
     </task>
     <task id="LOCAL-00001" summary="建立初始工程">
       <created>1521904777876</created>
@@ -505,7 +535,14 @@
       <option name="project" value="LOCAL" />
       <updated>1523938722202</updated>
     </task>
-    <option name="localTasksCounter" value="5" />
+    <task id="LOCAL-00005" summary="补全注释">
+      <created>1523940613235</created>
+      <option name="number" value="00005" />
+      <option name="presentableId" value="LOCAL-00005" />
+      <option name="project" value="LOCAL" />
+      <updated>1523940613235</updated>
+    </task>
+    <option name="localTasksCounter" value="6" />
     <servers />
   </component>
   <component name="TestHistory">
@@ -541,7 +578,7 @@
     </history-entry>
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="25487000" />
+    <option name="totallyTimeSpent" value="28137000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="-8" y="-8" width="1936" height="1056" extended-state="6" />
@@ -560,9 +597,8 @@
       <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Capture Tool" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
       <window_info id="Designer" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
-      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.17643923" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
+      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.17803837" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
       <window_info id="Database" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32936078" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
       <window_info id="Structure" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
       <window_info id="Ant Build" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
       <window_info id="UI Designer" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
@@ -575,6 +611,7 @@
       <window_info id="Hierarchy" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="combo" />
       <window_info id="Messages" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32936078" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Inspection" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="5" side_tool="false" content_ui="tabs" />
+      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32936078" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
     </layout>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -603,22 +640,94 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="437">
+          <caret line="19" column="25" lean-forward="false" selection-start-line="19" selection-start-column="25" selection-end-line="19" selection-end-column="25" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="jar://$MAVEN_REPOSITORY$/org/apache/hadoop/hadoop-mapreduce-client-core/2.6.0-cdh5.7.0/hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar!/org/apache/hadoop/mapreduce/Reducer.class">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="207">
+          <caret line="17" column="13" lean-forward="false" selection-start-line="17" selection-start-column="13" selection-end-line="17" selection-end-column="13" />
+          <folding>
+            <marker date="1521904733592" expanded="false" signature="0:104" ph="/.../" />
+            <marker date="1521904733592" expanded="false" signature="151:462" ph="..." />
+            <marker date="1521904733592" expanded="true" signature="464:495" ph="@{...}" />
+            <marker date="1521904733592" expanded="true" signature="574:581" ph="{}" />
+            <marker date="1521904733592" expanded="true" signature="708:715" ph="{}" />
+            <marker date="1521904733592" expanded="true" signature="880:1048" ph="{...}" />
+            <marker date="1521904733592" expanded="true" signature="1177:1184" ph="{}" />
+            <marker date="1521904733592" expanded="true" signature="1306:1766" ph="{...}" />
+            <marker date="1521904733592" expanded="true" signature="1861:1905" ph="{...}" />
+            <marker date="1521904733592" expanded="true" signature="1888:1899" ph="{}" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="jar://$MAVEN_REPOSITORY$/org/apache/hadoop/hadoop-mapreduce-client-core/2.6.0-cdh5.7.0/hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar!/org/apache/hadoop/mapreduce/Mapper.class">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="184">
+          <caret line="13" column="13" lean-forward="false" selection-start-line="13" selection-start-column="13" selection-end-line="13" selection-end-column="13" />
+          <folding>
+            <marker date="1521904733592" expanded="false" signature="0:104" ph="/.../" />
+            <marker date="1521904733592" expanded="false" signature="151:304" ph="..." />
+            <marker date="1521904733592" expanded="true" signature="306:321" ph="@{...}" />
+            <marker date="1521904733592" expanded="true" signature="398:405" ph="{}" />
+            <marker date="1521904733592" expanded="true" signature="531:538" ph="{}" />
+            <marker date="1521904733592" expanded="true" signature="688:730" ph="{...}" />
+            <marker date="1521904733592" expanded="true" signature="858:865" ph="{}" />
+            <marker date="1521904733592" expanded="true" signature="986:1248" ph="{...}" />
+            <marker date="1521904733592" expanded="true" signature="1340:1384" ph="{...}" />
+            <marker date="1521904733592" expanded="true" signature="1367:1378" ph="{}" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/AppTest.java">
       <provider selected="true" editor-type-id="text-editor">
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-          <caret line="9" column="13" lean-forward="false" selection-start-line="9" selection-start-column="13" selection-end-line="9" selection-end-column="13" />
+        <state relative-caret-position="115">
+          <caret line="7" column="28" lean-forward="true" selection-start-line="7" selection-start-column="28" selection-end-line="7" selection-end-column="28" />
           <folding />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java">
       <provider selected="true" editor-type-id="text-editor">
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-          <caret line="135" column="20" lean-forward="false" selection-start-line="135" selection-start-column="20" selection-end-line="135" selection-end-column="20" />
+        <state relative-caret-position="943">
+          <caret line="51" column="5" lean-forward="true" selection-start-line="20" selection-start-column="4" selection-end-line="51" selection-end-column="5" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/pom.xml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="782">
+          <caret line="34" column="40" lean-forward="false" selection-start-line="34" selection-start-column="40" selection-end-line="34" selection-end-column="40" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/AppTest.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="161">
+          <caret line="9" column="13" lean-forward="false" selection-start-line="9" selection-start-column="13" selection-end-line="9" selection-end-column="13" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="3105">
+          <caret line="135" column="20" lean-forward="false" selection-start-line="135" selection-start-column="20" selection-end-line="135" selection-end-column="20" />
           <folding>
             <element signature="imports" expanded="true" />
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-            <element signature="e#2610#2611#0" expanded="true" />
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@@ -645,8 +754,6 @@
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             <element signature="imports" expanded="true" />
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@@ -673,8 +780,6 @@
           <caret line="135" column="20" lean-forward="false" selection-start-line="135" selection-start-column="20" selection-end-line="135" selection-end-column="20" />
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             <element signature="imports" expanded="true" />
-            <element signature="e#2451#2611#0" expanded="true" />
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@@ -701,8 +806,6 @@
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             <element signature="imports" expanded="true" />
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-            <element signature="e#2610#2611#0" expanded="true" />
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@@ -721,8 +824,6 @@
           <caret line="27" column="26" lean-forward="false" selection-start-line="27" selection-start-column="26" selection-end-line="27" selection-end-column="26" />
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             <element signature="imports" expanded="true" />
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-            <element signature="e#2610#2611#0" expanded="true" />
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@@ -741,8 +842,6 @@
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             <element signature="imports" expanded="true" />
-            <element signature="e#2451#2611#0" expanded="true" />
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@@ -761,8 +860,6 @@
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           <folding>
             <element signature="imports" expanded="true" />
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-            <element signature="e#2610#2611#0" expanded="true" />
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@@ -781,8 +878,6 @@
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           <folding>
             <element signature="imports" expanded="true" />
-            <element signature="e#2451#2611#0" expanded="true" />
-            <element signature="e#2610#2611#0" expanded="true" />
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@@ -801,8 +896,6 @@
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           <folding>
             <element signature="imports" expanded="true" />
-            <element signature="e#2451#2611#0" expanded="true" />
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@@ -821,8 +914,6 @@
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           <folding>
             <element signature="imports" expanded="true" />
-            <element signature="e#2451#2611#0" expanded="true" />
-            <element signature="e#2610#2611#0" expanded="true" />
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@@ -842,56 +933,70 @@
         </state>
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+    <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/App.java" />
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/Test.java" />
     <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/AppTest.java">
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+          <caret line="7" column="28" lean-forward="false" selection-start-line="7" selection-start-column="28" selection-end-line="7" selection-end-column="28" />
           <folding />
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       <provider selected="true" editor-type-id="text-editor">
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+          </folding>
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+      </provider>
+    </entry>
+    <entry file="jar://$MAVEN_REPOSITORY$/org/apache/hadoop/hadoop-mapreduce-client-core/2.6.0-cdh5.7.0/hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar!/org/apache/hadoop/mapreduce/Mapper.class">
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+      </provider>
+    </entry>
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          <caret line="95" column="68" lean-forward="false" selection-start-line="95" selection-start-column="68" selection-end-line="95" selection-end-column="68" />
+          <folding>
+            <element signature="imports" expanded="true" />
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diff --git a/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java b/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java
index 937bdbf..c75ed56 100644
--- a/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java
+++ b/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java
@@ -1,6 +1,7 @@
 package com.fjy.hadoop.mapreduce;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.LongWritable;
 import org.apache.hadoop.io.Text;
@@ -87,6 +88,14 @@ public class WordCountApp {
         //创建Configuration
         Configuration configuration = new Configuration();
 
+        //清理已存在的输出目录
+        Path outputPath = new Path(args[1]);
+        FileSystem fileSystem = FileSystem.get(configuration);
+        if (fileSystem.exists(outputPath)){
+            fileSystem.delete(outputPath);
+            System.out.println("The exist files had been deleted!");
+        }
+
         //创建作业
         Job job = Job.getInstance(configuration, "wordcount");