From 20132cf503868b81306088b29f0cb53dd34eb591 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Sun, 8 Mar 2020 10:21:36 +0800
Subject: [PATCH 1/3] =?UTF-8?q?059=5Fweek06=5F=E5=A2=9E=E5=BC=BA=E4=BB=BB?=
 =?UTF-8?q?=E5=8A=A1=E5=8F=8A=E8=A1=A5=E5=85=85?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .idea/workspace.xml | 173 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 172 insertions(+), 1 deletion(-)

diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index aee8cca..33ed1f6 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,6 +4,7 @@
     <list default="true" id="849f0ad2-7b24-4b58-93af-d82b889f0304" name="Default Changelist" comment="">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
     </list>
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
@@ -12,15 +13,66 @@
   <component name="DefaultGradleProjectSettings">
     <option name="isMigrated" value="true" />
   </component>
+  <component name="FUSProjectUsageTrigger">
+    <session id="-1436947991">
+      <usages-collector id="statistics.lifecycle.project">
+        <counts>
+          <entry key="project.closed" value="1" />
+          <entry key="project.open.time.0" value="1" />
+          <entry key="project.open.time.10" value="1" />
+          <entry key="project.opened" value="2" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.extensions.open">
+        <counts>
+          <entry key="md" value="2" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.types.open">
+        <counts>
+          <entry key="Markdown" value="2" />
+        </counts>
+      </usages-collector>
+    </session>
+  </component>
+  <component name="FileEditorManager">
+    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/second/week_01/76/ArrayList.md">
+          <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
+            <state split_layout="FIRST">
+              <first_editor relative-caret-position="184">
+                <caret line="80" lean-forward="true" selection-start-line="80" selection-end-line="80" />
+              </first_editor>
+              <second_editor />
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
+  </component>
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
+  <component name="IdeDocumentHistory">
+    <option name="CHANGED_PATHS">
+      <list>
+        <option value="$PROJECT_DIR$/second/week_01/76/ArrayList.md" />
+      </list>
+    </option>
+  </component>
+  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
+  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
   <component name="JsFlowSettings">
     <service-enabled>true</service-enabled>
     <exe-path />
     <other-services-enabled>true</other-services-enabled>
     <auto-save>true</auto-save>
   </component>
+  <component name="JsGulpfileManager">
+    <detection-done>true</detection-done>
+    <sorting>DEFINITION_ORDER</sorting>
+  </component>
   <component name="MavenImportPreferences">
     <option name="generalSettings">
       <MavenGeneralSettings>
@@ -37,7 +89,51 @@
   <component name="MavenRunner">
     <option name="jreName" value="1.8" />
   </component>
+  <component name="ProjectFrameBounds" extendedState="6">
+    <option name="x" value="15" />
+    <option name="y" value="30" />
+    <option name="width" value="1890" />
+    <option name="height" value="930" />
+  </component>
   <component name="ProjectId" id="1W0KnGQQ4lLywjMN8yfRPmdRp8q" />
+  <component name="ProjectView">
+    <navigator proportions="" version="1">
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="JavaStudy" type="b2602c69:ProjectViewProjectNode" />
+              <item name="JavaStudy" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="JavaStudy" type="b2602c69:ProjectViewProjectNode" />
+              <item name="JavaStudy" type="462c0819:PsiDirectoryNode" />
+              <item name="second" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="JavaStudy" type="b2602c69:ProjectViewProjectNode" />
+              <item name="JavaStudy" type="462c0819:PsiDirectoryNode" />
+              <item name="second" type="462c0819:PsiDirectoryNode" />
+              <item name="week_01" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="JavaStudy" type="b2602c69:ProjectViewProjectNode" />
+              <item name="JavaStudy" type="462c0819:PsiDirectoryNode" />
+              <item name="second" type="462c0819:PsiDirectoryNode" />
+              <item name="week_01" type="462c0819:PsiDirectoryNode" />
+              <item name="76" type="462c0819:PsiDirectoryNode" />
+            </path>
+          </expand>
+          <select />
+        </subPane>
+      </pane>
+      <pane id="PackagesPane" />
+      <pane id="Scope" />
+    </panes>
+  </component>
   <component name="ProjectViewState">
     <option name="hideEmptyMiddlePackages" value="true" />
     <option name="showExcludedFiles" value="true" />
@@ -49,7 +145,7 @@
     <property name="SONARLINT_PRECOMMIT_ANALYSIS" value="true" />
     <property name="WebServerToolWindowFactoryState" value="false" />
     <property name="aspect.path.notification.shown" value="true" />
-    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1577631985552" />
+    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1583634055038" />
     <property name="last_opened_file_path" value="$PROJECT_DIR$" />
     <property name="node.js.detected.package.eslint" value="true" />
     <property name="node.js.detected.package.tslint" value="true" />
@@ -68,6 +164,18 @@
       <recent name="D:\algorithm\JavaStudy\week_01\1" />
     </key>
   </component>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
   <component name="ServiceViewManager">
     <option name="viewStates">
       <list>
@@ -100,6 +208,8 @@
       <workItem from="1578919635767" duration="694000" />
       <workItem from="1579450587735" duration="274000" />
       <workItem from="1580545712385" duration="1022000" />
+      <workItem from="1583592302865" duration="208000" />
+      <workItem from="1583633729128" duration="279000" />
     </task>
     <task id="LOCAL-00001" summary="目录创建">
       <created>1575879326719</created>
@@ -167,9 +277,48 @@
     <option name="localTasksCounter" value="10" />
     <servers />
   </component>
+  <component name="TimeTrackingManager">
+    <option name="totallyTimeSpent" value="487000" />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="-7" y="-7" width="1295" height="695" extended-state="6" />
+    <editor active="true" />
+    <layout>
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.25383994" />
+      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
+      <window_info id="Image Layers" order="2" />
+      <window_info id="Designer" order="3" />
+      <window_info id="UI Designer" order="4" />
+      <window_info id="Capture Tool" order="5" />
+      <window_info id="Favorites" order="6" side_tool="true" />
+      <window_info anchor="bottom" id="Message" order="0" />
+      <window_info anchor="bottom" id="Find" order="1" />
+      <window_info anchor="bottom" id="Run" order="2" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
+      <window_info anchor="bottom" id="TODO" order="6" />
+      <window_info anchor="bottom" id="Database Changes" order="7" show_stripe_button="false" />
+      <window_info anchor="bottom" id="Terminal" order="8" />
+      <window_info anchor="bottom" id="Event Log" order="9" side_tool="true" />
+      <window_info anchor="bottom" id="Version Control" order="10" />
+      <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
+      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+      <window_info anchor="right" id="Palette" order="3" />
+      <window_info anchor="right" id="Capture Analysis" order="4" />
+      <window_info anchor="right" id="Theme Preview" order="5" />
+      <window_info anchor="right" id="Palette&#9;" order="6" />
+      <window_info anchor="right" id="Database" order="7" />
+      <window_info anchor="right" id="Maven Projects" order="8" />
+    </layout>
+  </component>
   <component name="TypeScriptGeneratedFilesManager">
     <option name="version" value="1" />
   </component>
+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
   <component name="VcsManagerConfiguration">
     <MESSAGE value="目录创建" />
     <MESSAGE value="059_week02" />
@@ -199,6 +348,28 @@
     </state>
     <state x="461" y="241" key="com.intellij.ide.util.TipDialog/0.0.1536.824@0.0.1536.824" timestamp="1578708675877" />
   </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/first/week_01/09/ArrayList-009.md">
+      <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
+        <state split_layout="SPLIT">
+          <first_editor relative-caret-position="138">
+            <caret line="6" lean-forward="true" selection-end-line="215" />
+          </first_editor>
+          <second_editor />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/second/week_01/76/ArrayList.md">
+      <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
+        <state split_layout="FIRST">
+          <first_editor relative-caret-position="184">
+            <caret line="80" lean-forward="true" selection-start-line="80" selection-end-line="80" />
+          </first_editor>
+          <second_editor />
+        </state>
+      </provider>
+    </entry>
+  </component>
   <component name="masterDetails">
     <states>
       <state key="ProjectJDKs.UI">
-- 
Gitee


From 74d40db6c1bd2921d1074002b98f8d0384fb1335 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Sun, 8 Mar 2020 10:34:31 +0800
Subject: [PATCH 2/3] 76

---
 second/week_01/76/ArrayList.md | 215 +++++++++++++++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 second/week_01/76/ArrayList.md

diff --git a/second/week_01/76/ArrayList.md b/second/week_01/76/ArrayList.md
new file mode 100644
index 0000000..206ac3c
--- /dev/null
+++ b/second/week_01/76/ArrayList.md
@@ -0,0 +1,215 @@
+##关于ArrayList小笔记
+
+
+###1、认识ArrayList
+	  
+1）ArrayList就是动态数组
+
+ ```java
+public class ArrayList<E> extends AbstractList<E>
+        implements List<E>, RandomAccess, Cloneable, java.io.Serializable
+ ```
+ 
+2）实现了List，提供了基础的添加、删除等操作；
+
+3）实现Cloneable；
+
+4）实现java.io.Serializable，可被序列化；
+ 
+5）实现RandomAccess，可随机访问。
+
+###2、属性概览
+
+```java
+/**
+ * 默认初始化大小.
+ */
+ private static final int DEFAULT_CAPACITY = 10;     
+ /**
+  * 空数组 当创建实例数量为空时使用.
+  */
+ private static final Object[] EMPTY_ELEMENTDATA = {};
+ /**
+  * 存储元素的数组.
+  */
+  transient Object[] elementData;// non-private to simplify nested class access
+ /**
+  * 数组大小.
+  */
+  private int size;
+        
+``` 
+
+###3、构造器
+```java
+/**
+ * 创建指定大小数组
+ * @param  数组大小
+ */
+public ArrayList(int initialCapacity) {
+    super();
+    // 如果传入大小小于0，抛出异常
+    if (initialCapacity < 0)
+        throw new IllegalArgumentException("Illegal Capacity: "+
+                                           initialCapacity);
+    // 创建指定容量大小新数组
+    this.elementData = new Object[initialCapacity];
+}
+    
+/**
+ * 默认构造器为空数组，使用时按默认大小 
+ */
+ public ArrayList() {
+    super();
+    this.elementData = EMPTY_ELEMENTDATA;
+}
+    
+/**
+ * 将传入的集合转成数组
+ */
+ public ArrayList(Collection<? extends E> c) {
+    elementData = c.toArray();
+    size = elementData.length;
+    // c.toArray might (incorrectly) not return Object[] (see 6260652)
+    //see 6260652为bug编号 https://bugs.java.com/bugdatabase/view_bug.do?bug_id=6260652
+    if (elementData.getClass() != Object[].class)
+        elementData = Arrays.copyOf(elementData, size, Object[].class);
+}
+	
+```
+ps：针对最后一类创建数组方式为什么返回不一定是一个对象，测试如下：
+
+```java
+//第一种方式
+List<String> test1 = new ArrayList<String>( );
+test1.add("123");
+System.out.println(test1.toArray());
+//返回结果：[Ljava.lang.Object;@a74868d
+	
+//第二种方式
+List<String> test2 = Arrays.asList("123");
+System.out.println(test2.toArray());
+//返回结果：[Ljava.lang.String;@12c8a2c0
+```
+	
+### 4、add
+1）add(E e)
+
+```java
+/**
+ * 添加数组，从末尾开始添加
+ */
+public boolean add(E e) {
+   //检查是否需要扩容
+    ensureCapacityInternal(size + 1);  // Increments modCount!!
+    //将元素添加到数组最后一位
+    elementData[size++] = e;
+    return true;
+}
+
+private void ensureCapacityInternal(int minCapacity) {
+	//如果是空数组，则初始化默认大小10
+    if (elementData == EMPTY_ELEMENTDATA) {
+        minCapacity = Math.max(DEFAULT_CAPACITY, minCapacity);
+    }
+    ensureExplicitCapacity(minCapacity);
+}
+
+private void ensureExplicitCapacity(int minCapacity) {
+	//用于统计list被修改的次数
+    modCount++;	
+    // overflow-conscious code
+    if (minCapacity - elementData.length > 0)
+    //扩容
+    grow(minCapacity);
+}
+
+private void grow(int minCapacity) {
+    // overflow-conscious code
+    int oldCapacity = elementData.length;
+    //扩容1.5倍
+    int newCapacity = oldCapacity + (oldCapacity >> 1);
+    //如果新容量小于需要最小容量，则以需要容量为准
+    if (newCapacity - minCapacity < 0)
+        newCapacity = minCapacity;
+    //如果新容量大于最大容量，则以最大容量为准
+    if (newCapacity - MAX_ARRAY_SIZE > 0)
+        newCapacity = hugeCapacity(minCapacity);
+    // minCapacity is usually close to size, so this is a win:
+    //以新容量拷贝一个新数组出来
+    elementData = Arrays.copyOf(elementData, newCapacity);
+}
+```
+2）add(int index, E element)
+
+``` java
+/**
+ * 添加元素到指定位置
+ */
+public void add(int index, E element) {
+	//检查是否越界
+    rangeCheckForAdd(index);
+    //检查是否需要扩容
+    ensureCapacityInternal(size + 1);  // Increments modCount!!
+    //将数组index之后的元素往后移动一位
+    System.arraycopy(elementData, index, elementData, index + 1,
+                     size - index);
+    //再将index设置为需要添加的元素
+    elementData[index] = element;
+    //数组长度+1
+    size++;
+}
+```
+
+###5、get
+
+``` java
+/**
+ * 获得指定位置该元素
+ */
+public E get(int index) {
+	///检查是否越界
+    rangeCheck(index);
+    //返回元素
+    return elementData(index);
+}
+
+
+private void rangeCheck(int index) {
+  if (index < 0 || index >= this.size)
+            throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+}
+
+private void checkForComodification() {
+	//保证操作为同一list（考虑并发情况下）
+	if (ArrayList.this.modCount != this.modCount)
+     throw new ConcurrentModificationException();
+}
+        
+``` 
+
+###6、remove
+
+``` java	
+/**
+ * 删除指定位置元素
+ */
+public E remove(int index) {
+	//检查是否越界
+    rangeCheck(index);
+	
+    modCount++;
+    //获取index位置元素
+    E oldValue = elementData(index);
+	 //如果index不是最后一位，则把index之后的元素往前挪一位
+    int numMoved = size - index - 1;
+    if (numMoved > 0)
+        System.arraycopy(elementData, index+1, elementData, index,
+                         numMoved);
+    //// 将最后一个元素删除，帮助GC
+    elementData[--size] = null; // clear to let GC do its work
+    //返回删除旧值
+    return oldValue;
+}
+
+``` 
-- 
Gitee


From 8b0ef845c60677c7cee553d7bcbc8226ae5ba19d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=90=BD=E5=8F=B6?= <zhengxm1008@qq.com>
Date: Sun, 8 Mar 2020 10:43:46 +0800
Subject: [PATCH 3/3] =?UTF-8?q?=E5=88=A0=E9=99=A4=E6=96=87=E4=BB=B6=20.ide?=
 =?UTF-8?q?a/workspace.xml?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .idea/workspace.xml | 389 --------------------------------------------
 1 file changed, 389 deletions(-)
 delete mode 100644 .idea/workspace.xml

diff --git a/.idea/workspace.xml b/.idea/workspace.xml
deleted file mode 100644
index 33ed1f6..0000000
--- a/.idea/workspace.xml
+++ /dev/null
@@ -1,389 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ChangeListManager">
-    <list default="true" id="849f0ad2-7b24-4b58-93af-d82b889f0304" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-    </list>
-    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
-    <option name="SHOW_DIALOG" value="false" />
-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
-  </component>
-  <component name="DefaultGradleProjectSettings">
-    <option name="isMigrated" value="true" />
-  </component>
-  <component name="FUSProjectUsageTrigger">
-    <session id="-1436947991">
-      <usages-collector id="statistics.lifecycle.project">
-        <counts>
-          <entry key="project.closed" value="1" />
-          <entry key="project.open.time.0" value="1" />
-          <entry key="project.open.time.10" value="1" />
-          <entry key="project.opened" value="2" />
-        </counts>
-      </usages-collector>
-      <usages-collector id="statistics.file.extensions.open">
-        <counts>
-          <entry key="md" value="2" />
-        </counts>
-      </usages-collector>
-      <usages-collector id="statistics.file.types.open">
-        <counts>
-          <entry key="Markdown" value="2" />
-        </counts>
-      </usages-collector>
-    </session>
-  </component>
-  <component name="FileEditorManager">
-    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/second/week_01/76/ArrayList.md">
-          <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
-            <state split_layout="FIRST">
-              <first_editor relative-caret-position="184">
-                <caret line="80" lean-forward="true" selection-start-line="80" selection-end-line="80" />
-              </first_editor>
-              <second_editor />
-            </state>
-          </provider>
-        </entry>
-      </file>
-    </leaf>
-  </component>
-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-  </component>
-  <component name="IdeDocumentHistory">
-    <option name="CHANGED_PATHS">
-      <list>
-        <option value="$PROJECT_DIR$/second/week_01/76/ArrayList.md" />
-      </list>
-    </option>
-  </component>
-  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
-  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
-  <component name="JsFlowSettings">
-    <service-enabled>true</service-enabled>
-    <exe-path />
-    <other-services-enabled>true</other-services-enabled>
-    <auto-save>true</auto-save>
-  </component>
-  <component name="JsGulpfileManager">
-    <detection-done>true</detection-done>
-    <sorting>DEFINITION_ORDER</sorting>
-  </component>
-  <component name="MavenImportPreferences">
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-- 
Gitee