diff --git a/.gradle/7.1/dependencies-accessors/dependencies-accessors.lock b/.gradle/7.1/dependencies-accessors/dependencies-accessors.lock
new file mode 100644
index 0000000000000000000000000000000000000000..ea7853b35c24fa9c7cab42a4d30602d34cf8ca4c
Binary files /dev/null and b/.gradle/7.1/dependencies-accessors/dependencies-accessors.lock differ
diff --git a/.gradle/7.1/dependencies-accessors/gc.properties b/.gradle/7.1/dependencies-accessors/gc.properties
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/.gradle/7.1/executionHistory/executionHistory.bin b/.gradle/7.1/executionHistory/executionHistory.bin
new file mode 100644
index 0000000000000000000000000000000000000000..b8b58690fd5561f56d06f6b62fbc679448c3ff8a
Binary files /dev/null and b/.gradle/7.1/executionHistory/executionHistory.bin differ
diff --git a/.gradle/7.1/executionHistory/executionHistory.lock b/.gradle/7.1/executionHistory/executionHistory.lock
new file mode 100644
index 0000000000000000000000000000000000000000..7f2a7d61ab112334be133ae361ccafdfeefa532b
Binary files /dev/null and b/.gradle/7.1/executionHistory/executionHistory.lock differ
diff --git a/.gradle/7.1/fileChanges/last-build.bin b/.gradle/7.1/fileChanges/last-build.bin
new file mode 100644
index 0000000000000000000000000000000000000000..f76dd238ade08917e6712764a16a22005a50573d
Binary files /dev/null and b/.gradle/7.1/fileChanges/last-build.bin differ
diff --git a/.gradle/7.1/fileHashes/fileHashes.bin b/.gradle/7.1/fileHashes/fileHashes.bin
new file mode 100644
index 0000000000000000000000000000000000000000..36a76e19f7208eb420e132f67cb1af05016192c7
Binary files /dev/null and b/.gradle/7.1/fileHashes/fileHashes.bin differ
diff --git a/.gradle/7.1/fileHashes/fileHashes.lock b/.gradle/7.1/fileHashes/fileHashes.lock
new file mode 100644
index 0000000000000000000000000000000000000000..6a423da5aaec22cb1e57be11ad6ec9d79928e4ad
Binary files /dev/null and b/.gradle/7.1/fileHashes/fileHashes.lock differ
diff --git a/.gradle/7.1/gc.properties b/.gradle/7.1/gc.properties
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/.gradle/buildOutputCleanup/buildOutputCleanup.lock b/.gradle/buildOutputCleanup/buildOutputCleanup.lock
new file mode 100644
index 0000000000000000000000000000000000000000..17f3370ac40e774b372d80fcd65488a2f18aad2e
Binary files /dev/null and b/.gradle/buildOutputCleanup/buildOutputCleanup.lock differ
diff --git a/.gradle/buildOutputCleanup/cache.properties b/.gradle/buildOutputCleanup/cache.properties
new file mode 100644
index 0000000000000000000000000000000000000000..2c627970e9b9f189a858bb7bd3e25025b897f357
--- /dev/null
+++ b/.gradle/buildOutputCleanup/cache.properties
@@ -0,0 +1,2 @@
+#Tue Feb 07 12:29:24 IST 2023
+gradle.version=7.1
diff --git a/.gradle/buildOutputCleanup/outputFiles.bin b/.gradle/buildOutputCleanup/outputFiles.bin
new file mode 100644
index 0000000000000000000000000000000000000000..8b184e4eb804ad8f3da13a508b382f324d5e052d
Binary files /dev/null and b/.gradle/buildOutputCleanup/outputFiles.bin differ
diff --git a/.gradle/checksums/checksums.lock b/.gradle/checksums/checksums.lock
new file mode 100644
index 0000000000000000000000000000000000000000..751ea3b295f918b1d996636e43be40cda26c7e02
Binary files /dev/null and b/.gradle/checksums/checksums.lock differ
diff --git a/.gradle/vcs-1/gc.properties b/.gradle/vcs-1/gc.properties
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..26d33521af10bcc7fd8cea344038eaaeb78d0ef5
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000000000000000000000000000000000000..33279010110a741118b6b93916bbd03545d5ed26
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="CompilerConfiguration">
+ <annotationProcessing>
+ <profile name="Gradle Imported" enabled="true">
+ <outputRelativeToContentRoot value="true" />
+ <processorPath useClasspath="false">
+ <entry name="$USER_HOME$/caches/modules-2/files-2.1/org.projectlombok/lombok/1.18.26/8f8cf0372abf564913e9796623aac4c8ea44025a/lombok-1.18.26.jar" />
+ </processorPath>
+ <module name="Java8Demo.test" />
+ <module name="Java8Demo.main" />
+ </profile>
+ </annotationProcessing>
+ <bytecodeTargetLevel target="1.8" />
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
new file mode 100644
index 0000000000000000000000000000000000000000..358bd56aa62b4dd733d5f2b062d58d4dba514228
--- /dev/null
+++ b/.idea/gradle.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="GradleMigrationSettings" migrationVersion="1" />
+ <component name="GradleSettings">
+ <option name="linkedExternalProjectsSettings">
+ <GradleProjectSettings>
+ <option name="delegatedBuild" value="true" />
+ <option name="testRunner" value="GRADLE" />
+ <option name="distributionType" value="DEFAULT_WRAPPED" />
+ <option name="externalProjectPath" value="$PROJECT_DIR$" />
+ <option name="gradleHome" value="$USER_HOME$/apps/gradle-7.3" />
+ <option name="gradleJvm" value="1.8" />
+ <option name="modules">
+ <set>
+ <option value="$PROJECT_DIR$" />
+ </set>
+ </option>
+ </GradleProjectSettings>
+ </option>
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
new file mode 100644
index 0000000000000000000000000000000000000000..fdc392fe877c32ab51d532fa67f65ff2e75e9061
--- /dev/null
+++ b/.idea/jarRepositories.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="RemoteRepositoriesConfiguration">
+ <remote-repository>
+ <option name="id" value="central" />
+ <option name="name" value="Maven Central repository" />
+ <option name="url" value="https://repo1.maven.org/maven2" />
+ </remote-repository>
+ <remote-repository>
+ <option name="id" value="jboss.community" />
+ <option name="name" value="JBoss Community repository" />
+ <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+ </remote-repository>
+ <remote-repository>
+ <option name="id" value="MavenRepo" />
+ <option name="name" value="MavenRepo" />
+ <option name="url" value="https://repo.maven.apache.org/maven2/" />
+ </remote-repository>
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000000000000000000000000000000000000..b0051c81efc26311d5284835857e4d62269d34bb
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="ExternalStorageConfigurationManager" enabled="true" />
+ <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK" />
+</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
new file mode 100644
index 0000000000000000000000000000000000000000..797acea53eb091cf5b30518802c3073f544adeed
--- /dev/null
+++ b/.idea/runConfigurations.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="RunConfigurationProducerService">
+ <option name="ignoredProducers">
+ <set>
+ <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
+ </set>
+ </option>
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/sonarlint/issuestore/index.pb b/.idea/sonarlint/issuestore/index.pb
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000000000000000000000000000000000000..35eb1ddfbbc029bcab630581847471d7f238ec53
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="VcsDirectoryMappings">
+ <mapping directory="" vcs="Git" />
+ </component>
+</project>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..f1bb15c8aceffecd95c237adce83469957038d5c
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,24 @@
+plugins {
+ id 'java'
+}
+
+group 'org.example'
+version '1.0-SNAPSHOT'
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
+ testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
+ compileOnly 'org.projectlombok:lombok:1.18.26'
+ annotationProcessor 'org.projectlombok:lombok:1.18.26'
+
+ testCompileOnly 'org.projectlombok:lombok:1.18.26'
+ testAnnotationProcessor 'org.projectlombok:lombok:1.18.26'
+}
+
+test {
+ useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/build/classes/java/main/GroupByExamples.class b/build/classes/java/main/GroupByExamples.class
new file mode 100644
index 0000000000000000000000000000000000000000..15fa36547f6fb7261de89710113ece98e6eaa5d5
Binary files /dev/null and b/build/classes/java/main/GroupByExamples.class differ
diff --git a/build/classes/java/main/SortExample.class b/build/classes/java/main/SortExample.class
new file mode 100644
index 0000000000000000000000000000000000000000..f27b8f64dcce247b97388ff5625350e5c8241ff1
Binary files /dev/null and b/build/classes/java/main/SortExample.class differ
diff --git a/build/classes/java/main/domain/Department.class b/build/classes/java/main/domain/Department.class
new file mode 100644
index 0000000000000000000000000000000000000000..6d70d2948ea0d12b68bcbb017b570c20e431ba74
Binary files /dev/null and b/build/classes/java/main/domain/Department.class differ
diff --git a/build/classes/java/main/domain/Person.class b/build/classes/java/main/domain/Person.class
new file mode 100644
index 0000000000000000000000000000000000000000..d4e686c72248e1aede5ebe455bf7cd39e0585809
Binary files /dev/null and b/build/classes/java/main/domain/Person.class differ
diff --git a/build/libs/Java8Demo-1.0-SNAPSHOT.jar b/build/libs/Java8Demo-1.0-SNAPSHOT.jar
new file mode 100644
index 0000000000000000000000000000000000000000..e509835814d93af839cdcfe76eb90b8909c12136
Binary files /dev/null and b/build/libs/Java8Demo-1.0-SNAPSHOT.jar differ
diff --git a/build/tmp/compileJava/previous-compilation-data.bin b/build/tmp/compileJava/previous-compilation-data.bin
new file mode 100644
index 0000000000000000000000000000000000000000..95ab3533e2745008f19fe0e3e72193a6e801e4ac
Binary files /dev/null and b/build/tmp/compileJava/previous-compilation-data.bin differ
diff --git a/build/tmp/jar/MANIFEST.MF b/build/tmp/jar/MANIFEST.MF
new file mode 100644
index 0000000000000000000000000000000000000000..59499bce4a2bd51cba227b7c00fcf745b19c95a4
--- /dev/null
+++ b/build/tmp/jar/MANIFEST.MF
@@ -0,0 +1,2 @@
+Manifest-Version: 1.0
+
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000000000000000000000000000000000000..7454180f2ae8848c63b8b4dea2cb829da983f2fa
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000000000000000000000000000000000000..69a9715077f4fe68764b2e50867736b0c7f015a2
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000000000000000000000000000000000000..744e882ed57263a19bf3a504977da292d009345f
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+## 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 "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+ echo "$*"
+}
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MSYS* | MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$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 or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; 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=`expr $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"
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000000000000000000000000000000000000..107acd32c4e687021ef32db511e8a206129b88ec
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@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 Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@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="-Xmx64m" "-Xms64m"
+
+@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 execute
+
+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 execute
+
+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
+
+: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 %*
+
+: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/settings.gradle b/settings.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..3b64247d4a613290f4699c6349be572502eeec73
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'Java8Demo'
+
diff --git a/src/main/java/GroupByExamples.java b/src/main/java/GroupByExamples.java
new file mode 100644
index 0000000000000000000000000000000000000000..4f74152528baeb4ec9123218f16b633e083e2c95
--- /dev/null
+++ b/src/main/java/GroupByExamples.java
@@ -0,0 +1,86 @@
+import domain.Department;
+import domain.Person;
+import javafx.util.Pair;
+
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import static java.util.stream.Collectors.averagingDouble;
+import static java.util.stream.Collectors.counting;
+import static java.util.stream.Collectors.mapping;
+import static java.util.stream.Collectors.maxBy;
+import static java.util.stream.Collectors.toList;
+
+public class GroupByExamples {
+
+ public static void main(String[] args) {
+
+ List<Person> list = Arrays.asList(new Person(1, "Alex", 100d, new Department(1, "HR")), new Person(2, "Brian",
+ 200d, new Department(1, "HR")), new Person(3, "Charles", 900d, new Department(2, "Finance")), new Person(4,
+ "David", 200d, new Department(2, "Finance")), new Person(5, "Edward", 200d, new Department(2, "Finance")),
+ new Person(6, "Frank", 800d, new Department(3, "ADMIN")), new Person(7, "George", 900d, new Department(3,
+ "ADMIN")));
+
+ System.out.println("GroupByExamples by Simple Condition :" + simpleCondition(list));
+
+ System.out.println(" collect only the person ids in all departments" + personIds(list));
+
+ System.out.println("GroupByExamples by Complex Condition" + complex(list));
+
+ System.out.println("GroupByExamples with Counting" + count(list));
+
+ System.out.println(" GroupByExamples with Average" + average(list));
+
+ System.out.println(" GroupByExamples with Max/Min" + max(list));
+
+ System.out.println("GroupByExamples with Filtering" + filter(list));
+
+
+ Map<Integer, Department> departmentMap = list
+ .stream()
+ .collect(Collectors.toMap(Person::getId, Person::getDepartment));
+ }
+
+ private static Map<Department, List<Person>> filter(final List<Person> list) {
+ return list
+ .stream()
+ .filter(person -> person.getSalary() > 100)
+ .collect(Collectors.groupingBy(Person::getDepartment));
+ }
+
+ private static Map<Department, Optional<Person>> max(final List<Person> list) {
+ return list
+ .stream()
+ .collect(Collectors.groupingBy(Person::getDepartment, maxBy(Comparator.comparing(Person::getSalary))));
+ }
+
+ private static Map<Department, Double> average(final List<Person> list) {
+ return list.stream().collect(Collectors.groupingBy(Person::getDepartment, averagingDouble(Person::getSalary)));
+ }
+
+ private static Map<Department, Long> count(final List<Person> list) {
+ return list.stream().collect(Collectors.groupingBy(Person::getDepartment, counting()));
+ }
+
+ private static Map<Object, List<Integer>> complex(final List<Person> list) {
+ return list
+ .stream()
+ .collect(Collectors.groupingBy(person -> new Pair<>(person.getSalary(), person.getSalary()),
+ Collectors.mapping(Person::getId, toList())));
+
+ }
+
+ private static Map<Department, List<Integer>> personIds(final List<Person> list) {
+ return list.stream().collect(Collectors.groupingBy(Person::getDepartment, mapping(Person::getId, toList())));
+ }
+
+ private static Map<Department, List<Person>> simpleCondition(final List<Person> list) {
+ return list.stream().collect(Collectors.groupingBy(Person::getDepartment));
+ }
+
+
+}
diff --git a/src/main/java/SortExample.java b/src/main/java/SortExample.java
new file mode 100644
index 0000000000000000000000000000000000000000..b8e658f5b9c1ade696a73b0e08c06121d315a5ad
--- /dev/null
+++ b/src/main/java/SortExample.java
@@ -0,0 +1,11 @@
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class SortExample {
+ public static void main(String[] args) {
+ List<Integer> list = Arrays.asList(2, 4, 1, 3, 7, 5, 9, 6, 8);
+ list = list.stream().sorted((o1, o2) -> o2.compareTo(o1)).collect(Collectors.toList());
+ System.out.println(list);
+ }
+}
diff --git a/src/main/java/domain/Department.java b/src/main/java/domain/Department.java
new file mode 100644
index 0000000000000000000000000000000000000000..7ee7a89b087dba5b74ca8ef108eaa58b91872c2e
--- /dev/null
+++ b/src/main/java/domain/Department.java
@@ -0,0 +1,16 @@
+package domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Department {
+
+ private int id;
+ private String name;
+
+
+}
diff --git a/src/main/java/domain/Person.java b/src/main/java/domain/Person.java
new file mode 100644
index 0000000000000000000000000000000000000000..753831078c4745a9ea02f29310ed08838e8ea110
--- /dev/null
+++ b/src/main/java/domain/Person.java
@@ -0,0 +1,21 @@
+package domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Getter
+@Setter
+public class Person {
+
+ public int id;
+ public String name;
+ public Double salary;
+ public Department department;
+
+}
\ No newline at end of file