Update

.idea/libraries/.xml

+<component name="libraryTable">
+  <library name="系统盘">
+    <CLASSES>
+      <root url="file://$USER_HOME$/.idlerc" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file

.idea/libraries/java12.xml

+<component name="libraryTable">
+  <library name="java12">
+    <CLASSES>
+      <root url="file://D:/Program Files/Java/jdk-12.0.1/lib" />
+      <root url="file://D:/Program Files/Java/jdk-12.0.1/docs" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="file://D:/Program Files/Java/jdk-12.0.1/lib" />
+    </SOURCES>
+    <jarDirectory url="file://D:/Program Files/Java/jdk-12.0.1/lib" recursive="false" />
+    <jarDirectory url="file://D:/Program Files/Java/jdk-12.0.1/lib" recursive="false" type="SOURCES" />
+  </library>
+</component>
\ No newline at end of file

.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="JavadocGenerationManager">
+    <option name="OUTPUT_DIRECTORY" value="$PROJECT_DIR$/Java帮助文档" />
+    <option name="OPTION_INCLUDE_LIBS" value="true" />
+    <option name="OPTION_LINK_TO_JDK_DOCS" value="true" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_12" default="true" project-jdk-name="12" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file

IDEA_JAVA.iml

@@ -5,7 +5,11 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
     </content>
-    <orderEntry type="jdk" jdkName="12" jdkType="JavaSDK" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="jdk" jdkName="12" jdkType="JavaSDK" />
+    <orderEntry type="library" exported="" name="java12" level="project" />
+    <orderEntry type="library" name="java11" level="application" />
+    <orderEntry type="library" name="系统盘" level="project" />
+    <orderEntry type="library" name="java12" level="application" />
   </component>
 </module>
\ No newline at end of file

src/Java常用类/test.java

-package Java常用类;//Java常用类
-
-//彭友聪
-//2019/6/1
-//19:59
-//IDEA_JAVA
-//email:2923616405@qq.com
-public class test {
-    private Object b;  //定义Object类型成员变量
-
-    public Object getB() {
-        return b;
-    }
-
-    public void setB(Object b) {
-        this.b = b;
-    }
-
-    public static void main(String[] args) {
-        test t = new test();
-        t.setB(Boolean.TRUE);  //向上转型操作
-        System.out.println(t.getB());
-        t.setB(12.3f);
-        Float f = (Float) (t.getB());  //向下转型操作
-        System.out.println(f);
-    }
-}

src/多线程/SwingAndThread.java

+package 多线程;
+
+// !/usr/bin/env jdk1.8
+// encoding:utf-8
+//@software:IntelliJ IDEA
+//@pack:多线程
+//@user:彭友聪
+//@date:2019/7/1
+//@time:10:49
+//@project:IDEA_JAVA
+//@file:SwingAndThread.java
+//Author:御承扬
+//email:2923616405@qq.com
+
+
+public class SwingAndThread {
+}