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java17Example
Commit 85372979 authored by Sarika Sama's avatar Sarika Sama
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View file @ 85372979
HELP.md
target/
!.mvn/wrapper/maven-wrapper.jar
!**/src/main/**/target/
!**/src/test/**/target/
### STS ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
### IntelliJ IDEA ###
.idea
*.iws
*.iml
*.ipr
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
build/
!**/src/main/**/build/
!**/src/test/**/build/
### VS Code ###
.vscode/
.mvn/wrapper/maven-wrapper.properties 0 → 100644
View file @ 85372979
distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.4/apache-maven-3.9.4-bin.zip
wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar
mvnw 0 → 100644
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mvnw.cmd 0 → 100644
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@REM ----------------------------------------------------------------------------
@REM Licensed to the Apache Software Foundation (ASF) under one
@REM or more contributor license agreements. See the NOTICE file
@REM distributed with this work for additional information
@REM regarding copyright ownership. The ASF licenses this file
@REM to you under the Apache License, Version 2.0 (the
@REM "License"); you may not use this file except in compliance
@REM with the License. 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,
@REM software distributed under the License is distributed on an
@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
@REM KIND, either express or implied. See the License for the
@REM specific language governing permissions and limitations
@REM under the License.
@REM ----------------------------------------------------------------------------
@REM ----------------------------------------------------------------------------
@REM Apache Maven Wrapper startup batch script, version 3.2.0
@REM
@REM Required ENV vars:
@REM JAVA_HOME - location of a JDK home dir
@REM
@REM Optional ENV vars
@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
@REM e.g. to debug Maven itself, use
@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
@REM ----------------------------------------------------------------------------
@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
@echo off
@REM set title of command window
title %0
@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
@if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO%
@REM set %HOME% to equivalent of $HOME
if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
@REM Execute a user defined script before this one
if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
@REM check for pre script, once with legacy .bat ending and once with .cmd ending
if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
:skipRcPre
@setlocal
set ERROR_CODE=0
@REM To isolate internal variables from possible post scripts, we use another setlocal
@setlocal
@REM ==== START VALIDATION ====
if not "%JAVA_HOME%" == "" goto OkJHome
echo.
echo Error: JAVA_HOME not found in your environment. >&2
echo Please set the JAVA_HOME variable in your environment to match the >&2
echo location of your Java installation. >&2
echo.
goto error
:OkJHome
if exist "%JAVA_HOME%\bin\java.exe" goto init
echo.
echo Error: JAVA_HOME is set to an invalid directory. >&2
echo JAVA_HOME = "%JAVA_HOME%" >&2
echo Please set the JAVA_HOME variable in your environment to match the >&2
echo location of your Java installation. >&2
echo.
goto error
@REM ==== END VALIDATION ====
:init
@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
@REM Fallback to current working directory if not found.
set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
set EXEC_DIR=%CD%
set WDIR=%EXEC_DIR%
:findBaseDir
IF EXIST "%WDIR%"\.mvn goto baseDirFound
cd ..
IF "%WDIR%"=="%CD%" goto baseDirNotFound
set WDIR=%CD%
goto findBaseDir
:baseDirFound
set MAVEN_PROJECTBASEDIR=%WDIR%
cd "%EXEC_DIR%"
goto endDetectBaseDir
:baseDirNotFound
set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
cd "%EXEC_DIR%"
:endDetectBaseDir
IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
@setlocal EnableExtensions EnableDelayedExpansion
for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
:endReadAdditionalConfig
SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
set WRAPPER_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
IF "%%A"=="wrapperUrl" SET WRAPPER_URL=%%B
)
@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
if exist %WRAPPER_JAR% (
if "%MVNW_VERBOSE%" == "true" (
echo Found %WRAPPER_JAR%
)
) else (
if not "%MVNW_REPOURL%" == "" (
SET WRAPPER_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
)
if "%MVNW_VERBOSE%" == "true" (
echo Couldn't find %WRAPPER_JAR%, downloading it ...
echo Downloading from: %WRAPPER_URL%
)
powershell -Command "&{"^
"$webclient = new-object System.Net.WebClient;"^
"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
"}"^
"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%WRAPPER_URL%', '%WRAPPER_JAR%')"^
"}"
if "%MVNW_VERBOSE%" == "true" (
echo Finished downloading %WRAPPER_JAR%
)
)
@REM End of extension
@REM If specified, validate the SHA-256 sum of the Maven wrapper jar file
SET WRAPPER_SHA_256_SUM=""
FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
IF "%%A"=="wrapperSha256Sum" SET WRAPPER_SHA_256_SUM=%%B
)
IF NOT %WRAPPER_SHA_256_SUM%=="" (
powershell -Command "&{"^
"$hash = (Get-FileHash \"%WRAPPER_JAR%\" -Algorithm SHA256).Hash.ToLower();"^
"If('%WRAPPER_SHA_256_SUM%' -ne $hash){"^
" Write-Output 'Error: Failed to validate Maven wrapper SHA-256, your Maven wrapper might be compromised.';"^
" Write-Output 'Investigate or delete %WRAPPER_JAR% to attempt a clean download.';"^
" Write-Output 'If you updated your Maven version, you need to update the specified wrapperSha256Sum property.';"^
" exit 1;"^
"}"^
"}"
if ERRORLEVEL 1 goto error
)
@REM Provide a "standardized" way to retrieve the CLI args that will
@REM work with both Windows and non-Windows executions.
set MAVEN_CMD_LINE_ARGS=%*
%MAVEN_JAVA_EXE% ^
%JVM_CONFIG_MAVEN_PROPS% ^
%MAVEN_OPTS% ^
%MAVEN_DEBUG_OPTS% ^
-classpath %WRAPPER_JAR% ^
"-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
%WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
if ERRORLEVEL 1 goto error
goto end
:error
set ERROR_CODE=1
:end
@endlocal & set ERROR_CODE=%ERROR_CODE%
if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
@REM check for post script, once with legacy .bat ending and once with .cmd ending
if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
:skipRcPost
@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
if "%MAVEN_BATCH_PAUSE%"=="on" pause
if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
cmd /C exit /B %ERROR_CODE%
pom.xml 0 → 100644
View file @ 85372979
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.1.4</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>java17Example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>java17Example</name>
<description>Demo project for Spring Boot java 17 </description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
src/main/java/com/example/java17Example/Employee.java 0 → 100644
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package com.example.java17Example;
public record Employee(String name, String department, double salary) {
}
src/main/java/com/example/java17Example/Java17ExampleApplication.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/*
Enhanced Performance: It can vary based on the specific use case, workload, and application design.
It's always recommended to profile and benchmark your application to identify performance bottlenecks and
choose the appropriate optimizations based on your requirements.
Sealed Classes and Interfaces: By using sealed classes and interfaces, you can better control the class hierarchy and ensure that only
specific subclasses or implementing classes are allowed,
improving code maintainability and robustness.
Record classes :Records are a powerful tool for creating simple,
data-centric classes without boilerplate code for getters, setters, equals, hashCode, and toString methods.
patternMatching for instanceOf:instanceof Pattern: This pattern is used to match an object's type against a specific class or interface, and it can bind the matched object to a pattern variable.
Pattern matching improves code readability and maintainability by eliminating the need for boilerplate code like type casting and
providing a more natural and structured way to handle different cases based on the structure or properties of the data.
pattern matching for switchExpression :The switch expression is enhanced to allow patterns in the case labels.
This enables matching against different patterns and binding matched values to pattern variables.
*/
@SpringBootApplication
public class Java17ExampleApplication {
public static void main(String[] args) {
}
}
src/main/java/com/example/java17Example/PatternMatchingExample.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
public class PatternMatchingExample {
public static void main(String[] args) {
Object obj = new User("sarika", 23);
if (obj instanceof User user) {
// Pattern matching of instance: obj is cast to 'user' if it's a User instance
System.out.println("User detected:");
System.out.println("Name: " + user.name());
System.out.println("Age: " + user.age());
} else {
System.out.println("Not a User instance.");
}
}
}
src/main/java/com/example/java17Example/RecordExample.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
/*
, we create instances of the Employee record and print their details using the generated toString() method.
We also access the record components using the generated accessor methods like name() and salary().
The record simplifies the creation and use of data-holding classes,
especially for cases where immutability and data access are important.
*/
public class RecordExample {
public static void main(String[] args) {
Employee employee1 = new Employee("Alice Smith", "HR", 50000.0);
Employee employee2 = new Employee("Bob Johnson", "IT", 60000.0);
// Printing employee details
System.out.println("Employee 1: " + employee1);
System.out.println("Employee 2: " + employee2);
// Accessing record components
System.out.println("Employee 1 Name: " + employee1.name());
System.out.println("Employee 2 Salary: $" + employee2.salary());
}
}
src/main/java/com/example/java17Example/SealedClassExample.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
/*
Sealed classes and interfaces enable you to define a specific set of subclasses that can extend or implement them,
providing more control over the inheritance hierarchy and allowing for better code structure and maintenance.
we have a sealed class Student that permits two subclasses: UndergraduateStudent and GraduateStudent.
The subclasses inherit from the sealed class Student.
The UndergraduateStudent class has an additional field for the academic year,
while the GraduateStudent class has a field for the research topic.
In the SealedClassExample class, we create instances of both subclasses and print their details.
*/
public class SealedClassExample {
public static void main(String[] args) {
UndergraduateStudent undergradStudent = new UndergraduateStudent("Alice", 1001, 2);
System.out.println("Undergraduate Student: " + undergradStudent.getName() +
", Student ID: " + undergradStudent.getStudentId() +
", Year: " + undergradStudent.getYear());
GraduateStudent gradStudent = new GraduateStudent("Bob", 2001, "Computer Science");
System.out.println("Graduate Student: " + gradStudent.getName() +
", Student ID: " + gradStudent.getStudentId() +
", Research Topic: " + gradStudent.getResearchTopic());
}
}
src/main/java/com/example/java17Example/Student.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
public sealed class Student permits UndergraduateStudent, GraduateStudent {
private String name;
private int studentId;
public Student(String name, int studentId) {
this.name = name;
this.studentId = studentId;
}
public String getName() {
return name;
}
public int getStudentId() {
return studentId;
}
}
final class UndergraduateStudent extends Student {
private int year;
public UndergraduateStudent(String name, int studentId, int year) {
super(name, studentId);
this.year = year;
}
public int getYear() {
return year;
}
}
final class GraduateStudent extends Student {
private String researchTopic;
public GraduateStudent(String name, int studentId, String researchTopic) {
super(name, studentId);
this.researchTopic = researchTopic;
}
public String getResearchTopic() {
return researchTopic;
}
}
src/main/java/com/example/java17Example/SwitchExpressionExample.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
import java.time.Month;
/*
we use a switch expression to determine the time of the year (winter, spring, summer, or autumn) based on the month.
The switch expression evaluates the given month and returns a message based on the season associated with that month
*/
public class SwitchExpressionExample {
public static void main(String[] args) {
Month month = Month.MARCH; // Example month
String timeOfDayMessage = switch (month) {
case DECEMBER, JANUARY, FEBRUARY -> "It's winter!";
case MARCH, APRIL, MAY -> "It's spring!";
case JUNE, JULY, AUGUST -> "It's summer!";
case SEPTEMBER, OCTOBER, NOVEMBER -> "It's autumn!";
};
System.out.println("For the month of " + month + ": " + timeOfDayMessage);
}
}
src/main/java/com/example/java17Example/SwitchExpressions.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
public class SwitchExpressions {
public static void main(String[] args) {
String day = "sunday";
String result = "";
result = switch (day){
case "monday" -> "6AM" ;
case "tuesday","wednesday","thursday" -> "7AM";
case "friday" -> "8AM";
default -> "9AM";
};
System.out.println(result);
}
}
src/main/java/com/example/java17Example/User.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
public record User(String name, int age) {
}
src/test/java/com/example/java17Example/Java17ExampleApplicationTests.java 0 → 100644
View file @ 85372979
package com.example.java17Example;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class Java17ExampleApplicationTests {
@Test
void contextLoads() {
}
}
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