From ec7a18100714b8eaa23d1f5fd76b868ca011db9b Mon Sep 17 00:00:00 2001
From: Lior Asis <liorbm1@gmail.com>
Date: Fri, 12 Apr 2019 13:25:05 +0300
Subject: [PATCH] basic-multithreading : why we need to use locks

---
 .../.idea/compiler.xml                        |  23 ++
 .../.idea/description.html                    |   1 +
 .../.idea/encodings.xml                       |   6 +
 FirstJavaProjectMultithreading/.idea/misc.xml |   9 +
 .../.idea/modules.xml                         |   8 +
 FirstJavaProjectMultithreading/.idea/vcs.xml  |   7 +
 .../.idea/workspace.xml                       | 232 ++++++++++++++++++
 .../FirstJavaMultithreadingProject.iml        |  12 +
 .../Main$1.class                              | Bin 0 -> 857 bytes
 .../FirstJavaMultithreadingProject/Main.class | Bin 0 -> 3072 bytes
 .../MyObject.class                            | Bin 0 -> 688 bytes
 .../META-INF/FirstJavaProject.kotlin_module   | Bin 0 -> 16 bytes
 .../production/FirstJavaProject/Main$1.class  | Bin 0 -> 857 bytes
 .../production/FirstJavaProject/Main.class    | Bin 0 -> 3081 bytes
 .../FirstJavaProject/MyObject.class           | Bin 0 -> 688 bytes
 FirstJavaProjectMultithreading/src/Main.java  | 117 +++++++++
 .../src/MyObject.java                         |  47 ++++
 17 files changed, 462 insertions(+)
 create mode 100644 FirstJavaProjectMultithreading/.idea/compiler.xml
 create mode 100644 FirstJavaProjectMultithreading/.idea/description.html
 create mode 100644 FirstJavaProjectMultithreading/.idea/encodings.xml
 create mode 100644 FirstJavaProjectMultithreading/.idea/misc.xml
 create mode 100644 FirstJavaProjectMultithreading/.idea/modules.xml
 create mode 100644 FirstJavaProjectMultithreading/.idea/vcs.xml
 create mode 100644 FirstJavaProjectMultithreading/.idea/workspace.xml
 create mode 100644 FirstJavaProjectMultithreading/FirstJavaMultithreadingProject.iml
 create mode 100644 FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/Main$1.class
 create mode 100644 FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/Main.class
 create mode 100644 FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/MyObject.class
 create mode 100644 FirstJavaProjectMultithreading/out/production/FirstJavaProject/META-INF/FirstJavaProject.kotlin_module
 create mode 100644 FirstJavaProjectMultithreading/out/production/FirstJavaProject/Main$1.class
 create mode 100644 FirstJavaProjectMultithreading/out/production/FirstJavaProject/Main.class
 create mode 100644 FirstJavaProjectMultithreading/out/production/FirstJavaProject/MyObject.class
 create mode 100644 FirstJavaProjectMultithreading/src/Main.java
 create mode 100644 FirstJavaProjectMultithreading/src/MyObject.java
diff --git a/FirstJavaProjectMultithreading/.idea/compiler.xml b/FirstJavaProjectMultithreading/.idea/compiler.xml
new file mode 100644
index 0000000..217af47
--- /dev/null
+++ b/FirstJavaProjectMultithreading/.idea/compiler.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <option name="DEFAULT_COMPILER" value="Javac" />
+    <resourceExtensions />
+    <wildcardResourcePatterns>
+      <entry name="!?*.java" />
+      <entry name="!?*.form" />
+      <entry name="!?*.class" />
+      <entry name="!?*.groovy" />
+      <entry name="!?*.scala" />
+      <entry name="!?*.flex" />
+      <entry name="!?*.kt" />
+      <entry name="!?*.clj" />
+    </wildcardResourcePatterns>
+    <annotationProcessing>
+      <profile default="true" name="Default" enabled="false">
+        <processorPath useClasspath="true" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>
+
diff --git a/FirstJavaProjectMultithreading/.idea/description.html b/FirstJavaProjectMultithreading/.idea/description.html
new file mode 100644
index 0000000..db5f129
--- /dev/null
+++ b/FirstJavaProjectMultithreading/.idea/description.html
@@ -0,0 +1 @@
+<html>Simple <b>Java</b> application that includes a class with <code>main()</code> method</html>
\ No newline at end of file
diff --git a/FirstJavaProjectMultithreading/.idea/encodings.xml b/FirstJavaProjectMultithreading/.idea/encodings.xml
new file mode 100644
index 0000000..ada92a5
--- /dev/null
+++ b/FirstJavaProjectMultithreading/.idea/encodings.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with NO BOM">
+    <file url="PROJECT" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/FirstJavaProjectMultithreading/.idea/misc.xml b/FirstJavaProjectMultithreading/.idea/misc.xml
new file mode 100644
index 0000000..c08f7b9
--- /dev/null
+++ b/FirstJavaProjectMultithreading/.idea/misc.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectKey">
+    <option name="state" value="project://63537948-39a4-48a0-9c97-34259a0fa913" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/FirstJavaProjectMultithreading/.idea/modules.xml b/FirstJavaProjectMultithreading/.idea/modules.xml
new file mode 100644
index 0000000..2d10f9c
--- /dev/null
+++ b/FirstJavaProjectMultithreading/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/FirstJavaMultithreadingProject.iml" filepath="$PROJECT_DIR$/FirstJavaMultithreadingProject.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/FirstJavaProjectMultithreading/.idea/vcs.xml b/FirstJavaProjectMultithreading/.idea/vcs.xml
new file mode 100644
index 0000000..def6a6a
--- /dev/null
+++ b/FirstJavaProjectMultithreading/.idea/vcs.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="" />
+  </component>
+</project>
+
diff --git a/FirstJavaProjectMultithreading/.idea/workspace.xml b/FirstJavaProjectMultithreading/.idea/workspace.xml
new file mode 100644
index 0000000..cfa8388
--- /dev/null
+++ b/FirstJavaProjectMultithreading/.idea/workspace.xml
@@ -0,0 +1,232 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="ce3cb7e5-3314-4916-a9e1-237a7c59e495" name="Default Changelist" comment="" />
+    <ignored path="$PROJECT_DIR$/out/" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="CoverageDataManager">
+    <SUITE FILE_PATH="coverage/FirstJavaProject$Main.ic" NAME="Main Coverage Results" MODIFIED="1553637776908" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="idea" COVERAGE_BY_TEST_ENABLED="false" COVERAGE_TRACING_ENABLED="false" />
+  </component>
+  <component name="CoverageViewManager">
+    <option name="myElementSize" value="190" />
+  </component>
+  <component name="DefaultGradleProjectSettings">
+    <option name="testRunner" value="GRADLE" />
+    <option name="delegatedBuild" value="true" />
+  </component>
+  <component name="FileEditorManager">
+    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/Main.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="1003">
+              <caret line="89" column="36" selection-start-line="89" selection-start-column="36" selection-end-line="89" selection-end-column="36" />
+              <folding>
+                <element signature="imports" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/MyObject.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="204">
+              <caret line="18" column="7" selection-start-line="18" selection-start-column="7" selection-end-line="18" selection-end-column="7" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="IdeDocumentHistory">
+    <option name="CHANGED_PATHS">
+      <list>
+        <option value="$PROJECT_DIR$/MyObject.java" />
+        <option value="$PROJECT_DIR$/src/MyObject2.java" />
+        <option value="$PROJECT_DIR$/src/MyObject.java" />
+        <option value="$PROJECT_DIR$/src/Main.java" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectFrameBounds" extendedState="6">
+    <option name="x" value="467" />
+    <option name="y" value="158" />
+    <option name="width" value="789" />
+    <option name="height" value="564" />
+  </component>
+  <component name="ProjectView">
+    <navigator proportions="" version="1">
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="Scope" />
+      <pane id="PackagesPane" />
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="FirstJavaProject" type="b2602c69:ProjectViewProjectNode" />
+              <item name="FirstJavaProject" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="FirstJavaProject" type="b2602c69:ProjectViewProjectNode" />
+              <item name="FirstJavaProject" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+            </path>
+          </expand>
+          <select />
+        </subPane>
+      </pane>
+    </panes>
+  </component>
+  <component name="PropertiesComponent">
+    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1553802754493" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/../Maman18" />
+    <property name="settings.editor.selected.configurable" value="preferences.editor" />
+  </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="RunManager">
+    <configuration name="Main" type="Application" factoryName="Application" temporary="true">
+      <option name="MAIN_CLASS_NAME" value="Main" />
+      <module name="FirstJavaMultithreadingProject" />
+      <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$" />
+      <RunnerSettings RunnerId="Run" />
+      <ConfigurationWrapper RunnerId="Run" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="Application.Main" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="ce3cb7e5-3314-4916-a9e1-237a7c59e495" name="Default Changelist" comment="" />
+      <created>1553364495035</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1553364495035</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="TodoView">
+    <todo-panel id="selected-file">
+      <is-autoscroll-to-source value="true" />
+    </todo-panel>
+    <todo-panel id="all">
+      <are-packages-shown value="true" />
+      <is-autoscroll-to-source value="true" />
+    </todo-panel>
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="-8" y="-8" width="1382" height="744" extended-state="6" />
+    <layout>
+      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.23676248" />
+      <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" weight="0.25490198" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.3627451" />
+      <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" weight="0.32843137" />
+      <window_info anchor="bottom" id="Terminal" order="7" weight="0.32843137" />
+      <window_info anchor="bottom" id="Event Log" order="8" side_tool="true" />
+      <window_info anchor="bottom" id="Version Control" order="9" />
+      <window_info anchor="bottom" id="Messages" 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="Maven" order="4" />
+      <window_info anchor="right" id="Theme Preview" order="5" />
+      <window_info anchor="right" id="Capture Analysis" order="6" />
+      <window_info anchor="right" id="Palette&#9;" order="7" />
+      <window_info anchor="right" id="Coverage" order="8" side_tool="true" weight="0.32980332" />
+    </layout>
+    <layout-to-restore>
+      <window_info content_ui="combo" id="Project" order="0" weight="0.44596443" />
+      <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" weight="0.23039216" />
+      <window_info active="true" anchor="bottom" id="Debug" order="3" visible="true" weight="0.3627451" />
+      <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" weight="0.3291367" />
+      <window_info anchor="bottom" id="Terminal" order="7" />
+      <window_info anchor="bottom" id="Event Log" order="8" side_tool="true" />
+      <window_info anchor="bottom" id="Version Control" order="9" />
+      <window_info anchor="bottom" id="Messages" 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="Maven" order="4" />
+      <window_info anchor="right" id="Theme Preview" order="5" />
+      <window_info anchor="right" id="Capture Analysis" order="6" />
+      <window_info anchor="right" id="Palette&#9;" order="7" />
+    </layout-to-restore>
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/MyObject.java" />
+    <entry file="file://$PROJECT_DIR$/src/MyObject2.java" />
+    <entry file="file://$PROJECT_DIR$/src/Main.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1003">
+          <caret line="89" column="36" selection-start-line="89" selection-start-column="36" selection-end-line="89" selection-end-column="36" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/MyObject.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="204">
+          <caret line="18" column="7" selection-start-line="18" selection-start-column="7" selection-end-line="18" selection-end-column="7" />
+        </state>
+      </provider>
+    </entry>
+  </component>
+</project>
\ No newline at end of file
diff --git a/FirstJavaProjectMultithreading/FirstJavaMultithreadingProject.iml b/FirstJavaProjectMultithreading/FirstJavaMultithreadingProject.iml
new file mode 100644
index 0000000..d5c0743
--- /dev/null
+++ b/FirstJavaProjectMultithreading/FirstJavaMultithreadingProject.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
+
diff --git a/FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/Main$1.class b/FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/Main$1.class
new file mode 100644
index 0000000000000000000000000000000000000000..3915e0a7dc117ed3f2175ca1b0c3166b1d372501
GIT binary patch
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diff --git a/FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/Main.class b/FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/Main.class
new file mode 100644
index 0000000000000000000000000000000000000000..4b694e7bae9d2e9b13b74bca155da8763e4960b4
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diff --git a/FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/MyObject.class b/FirstJavaProjectMultithreading/out/production/FirstJavaMultithreadingProject/MyObject.class
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diff --git a/FirstJavaProjectMultithreading/out/production/FirstJavaProject/META-INF/FirstJavaProject.kotlin_module b/FirstJavaProjectMultithreading/out/production/FirstJavaProject/META-INF/FirstJavaProject.kotlin_module
new file mode 100644
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diff --git a/FirstJavaProjectMultithreading/out/production/FirstJavaProject/Main$1.class b/FirstJavaProjectMultithreading/out/production/FirstJavaProject/Main$1.class
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diff --git a/FirstJavaProjectMultithreading/out/production/FirstJavaProject/Main.class b/FirstJavaProjectMultithreading/out/production/FirstJavaProject/Main.class
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diff --git a/FirstJavaProjectMultithreading/out/production/FirstJavaProject/MyObject.class b/FirstJavaProjectMultithreading/out/production/FirstJavaProject/MyObject.class
new file mode 100644
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GIT binary patch
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diff --git a/FirstJavaProjectMultithreading/src/Main.java b/FirstJavaProjectMultithreading/src/Main.java
new file mode 100644
index 0000000..7aa8188
--- /dev/null
+++ b/FirstJavaProjectMultithreading/src/Main.java
@@ -0,0 +1,117 @@
+import java.util.Scanner;
+import java.util.concurrent.ThreadLocalRandom;
+
+public class Main
+{
+    private final static int NUM_OF_ITER = 2000;
+    private final static int SLEEP_TIME = 10;
+
+    public static final String ANSI_RESET = "\u001B[0m";
+    public static final String ANSI_BLACK = "\u001B[30m";
+    public static final String ANSI_RED = "\u001B[31m";
+    public static final String ANSI_GREEN = "\u001B[32m";
+    public static final String ANSI_YELLOW = "\u001B[33m";
+    public static final String ANSI_BLUE = "\u001B[34m";
+    public static final String ANSI_PURPLE = "\u001B[35m";
+    public static final String ANSI_CYAN = "\u001B[36m";
+    public static final String ANSI_WHITE = "\u001B[37m";
+
+    public static void main(String[] args)
+    {
+        MyObject MyObj = new MyObject();
+
+        // nextInt is normally exclusive of the top value,
+        // so add 1 to make it inclusive
+        //ThreadLocalRandom.current().nextInt(MIN_SLEEP_TIME, MAX_SLEEP_TIME + 1);
+
+        // first thread
+        Thread first = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try
+                {
+                    for(int numOfIter = NUM_OF_ITER ; numOfIter > 0 ; --numOfIter)
+                    {
+                        //System.out.println(ANSI_RED + "Thread " + Thread.currentThread().getName() + " is incrementing. Current value: " + MyObj.getValue());
+                        //Thread.yield();
+
+                        MyObj.increment();
+                        Thread.sleep(SLEEP_TIME);
+                    }
+
+                }
+                catch (InterruptedException e)
+                {
+                    e.printStackTrace();
+                }
+            }
+        });
+
+
+
+        // second thread.
+        Thread second = new Thread(() -> {
+            try
+            {
+                for(int numOfIter = NUM_OF_ITER ; numOfIter > 0 ; --numOfIter)
+                {
+                    //System.out.println(ANSI_YELLOW + "Thread " + Thread.currentThread().getName() + " is decrementing. Current value: " + MyObj.getValue());
+                    //Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
+                    //Thread.yield();
+
+                    MyObj.decrement();
+                    Thread.sleep(SLEEP_TIME);
+                }
+
+            }
+            catch (InterruptedException e)
+            {
+                e.printStackTrace();
+            }
+        });
+
+        // third thread
+        Thread three = new Thread(() -> {
+            try
+            {
+                for(int numOfIter = NUM_OF_ITER ; numOfIter > 0 ; --numOfIter)
+                {
+                    //System.out.println(ANSI_YELLOW + "Thread " + Thread.currentThread().getName() + " is decrementing. Current value: " + MyObj.getValue());
+                    //Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
+                    //Thread.yield();
+
+                    MyObj.decrement();
+                    Thread.sleep(SLEEP_TIME);
+                }
+
+            }
+            catch (InterruptedException e)
+            {
+                e.printStackTrace();
+            }
+        });
+
+
+        first.start();
+        second.start();
+        three.start();
+
+
+        try
+        {
+            first.join();
+            second.join();
+            three.join();
+        }
+        catch (InterruptedException e)
+        {
+            e.printStackTrace();
+        }
+
+
+        System.out.println("The final value is : " + MyObj.getValue());
+        System.out.println("The current Therad Name is : " + Thread.currentThread().getName());
+
+
+    }
+}
diff --git a/FirstJavaProjectMultithreading/src/MyObject.java b/FirstJavaProjectMultithreading/src/MyObject.java
new file mode 100644
index 0000000..55935b6
--- /dev/null
+++ b/FirstJavaProjectMultithreading/src/MyObject.java
@@ -0,0 +1,47 @@
+
+public class MyObject
+{
+    private /*volatile*/ static int _x = 0;
+
+    /****************************************************/
+
+    public MyObject(int num)
+    {
+        this._x = num;
+    }
+
+    public MyObject()
+    {
+        this(0);
+    }
+    /****************************************************/
+
+    /**
+     * Increment the value of _x, by one.
+     */
+    public void increment()
+    {
+        this._x++;
+        //System.out.print(" |_x :" + this._x + "|");
+        //this._x = this._x + 1;
+    }
+
+    /**
+     * Decrement the value of _x, by one.
+     */
+    public void decrement()
+    {
+        //_x = _x - 1;
+        //System.out.print(" |_x :" + this._x + "|");
+        this._x--;
+    }
+
+    /**
+     *
+     * @return the current value of _x.
+     */
+    public int getValue()
+    {
+        return this._x;
+    }
+}
\ No newline at end of file
