Skip to content

J
Java8Demo
Commit 3f28aeb2 authored by Pinky Sabu's avatar Pinky Sabu
Browse files
Options

JAVA 8 EXAMPLES [Pinky Sabu]

parent 9eb5026c
Hide whitespace changes
Inline Side-by-side
Showing with 524 additions and 0 deletions
.gradle/buildOutputCleanup/cache.properties 0 → 100644
View file @ 3f28aeb2
#Tue Feb 07 12:29:24 IST 2023
gradle.version=7.1
.idea/.gitignore 0 → 100644
View file @ 3f28aeb2
# Default ignored files
/shelf/
/workspace.xml
.idea/compiler.xml 0 → 100644
View file @ 3f28aeb2
<?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
.idea/gradle.xml 0 → 100644
View file @ 3f28aeb2
<?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
.idea/jarRepositories.xml 0 → 100644
View file @ 3f28aeb2
<?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
.idea/misc.xml 0 → 100644
View file @ 3f28aeb2
<?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
.idea/runConfigurations.xml 0 → 100644
View file @ 3f28aeb2
<?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
.idea/vcs.xml 0 → 100644
View file @ 3f28aeb2
<?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
build.gradle 0 → 100644
View file @ 3f28aeb2
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
build/tmp/jar/MANIFEST.MF 0 → 100644
View file @ 3f28aeb2
Manifest-Version: 1.0
gradle/wrapper/gradle-wrapper.properties 0 → 100644
View file @ 3f28aeb2
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
gradlew 0 → 100755
View file @ 3f28aeb2
#!/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 "$JAVACMD" "$@"
gradlew.bat 0 → 100644
View file @ 3f28aeb2
@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
settings.gradle 0 → 100644
View file @ 3f28aeb2
rootProject.name = 'Java8Demo'
src/main/java/GroupByExamples.java 0 → 100644
View file @ 3f28aeb2
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));
}
}
src/main/java/SortExample.java 0 → 100644
View file @ 3f28aeb2
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);
}
}
src/main/java/domain/Department.java 0 → 100644
View file @ 3f28aeb2
package domain;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Department {
private int id;
private String name;
}
src/main/java/domain/Person.java 0 → 100644
View file @ 3f28aeb2
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
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment