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SomeshdiwanSomeshdiwan
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Migrate development environment from Windows to macOS and continue project updates
- Shifted primary development environment from Windows to macOS to ensure better performance, stability, and streamlined workflow for Java development. - Removed OS-specific metadata and ensured platform-agnostic project compatibility. - Normalized line endings to LF for cross-platform consistency. - Verified and adjusted file paths, permissions, and encoding settings to suit macOS environment. - Cleaned up unnecessary Windows-generated files and updated Git configuration accordingly. - Future commits and development will now be managed entirely from macOS. This migration ensures a cleaner, more consistent setup moving forward and prepares the project for scalable development across Unix-based systems. Future development will continue on macOS for a smoother, Unix-based experience. Signed-off-by: Someshdiwan <[email protected]>
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‎Section18ExceptionHandling/ClickLinks.cmd‎

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@echo off
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pushd "%~dp0"
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:MENU
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cls
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echo =========================================================
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echo Java Exception Handling - Helpful Links
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echo =========================================================
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echo 1. What Is an Exception? (Oracle Tutorial)
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echo 2. NullPointerException Class (Java SE 8 API)
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echo 3. java.lang Package Summary (Java SE 8)
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echo 4. Full Exceptions Tutorial (Oracle Docs)
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echo 5. Exit
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echo.
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set /p choice=Enter your choice [1-5]:
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if "%choice%"=="1" start https://docs.oracle.com/javase/tutorial/essential/exceptions/definition.html & goto MENU
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if "%choice%"=="2" start https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html & goto MENU
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if "%choice%"=="3" start https://docs.oracle.com/javase/8/docs/api/java/lang/package-summary.html#package.description & goto MENU
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if "%choice%"=="4" start https://docs.oracle.com/javase/tutorial/essential/exceptions/ & goto MENU
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if "%choice%"=="5" goto END
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echo.
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echo Invalid choice. Please select a number from 1 to 5.
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pause
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goto MENU
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:END
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echo Goodbye!
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pause
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popd

‎Section18ExceptionHandling/src/LinksOpen.cmd‎

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@echo off
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pushd "%~dp0"
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:MENU
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cls
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echo ================================================
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echo Java SE Documentation - Exception Class
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echo ================================================
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echo 1. Open Exception Class Documentation
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echo 2. Exit
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echo.
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set /p choice=Enter your choice [1-2]:
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if "%choice%"=="1" start https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Exception.html & goto MENU
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if "%choice%"=="2" goto END
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echo.
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echo Invalid choice. Please select 1 or 2.
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pause
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goto MENU
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:END
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echo Goodbye!
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pause
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popd

‎Section18ExceptionHandling/src/NegativeValueExceptionDemo.java‎

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class NegativeValueExceptionDemo
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{
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public static void main (String[] args)
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{
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try {
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int length = -5;
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int width = 3;
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// Call the static method directly using the class name
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int area = Rectangle.calculateArea(length, width);
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System.out.println("Area: " + area);
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}
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catch (NegativeValueException e) {
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System.out.println(e.getMessage());
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}
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}
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}

‎Section19MultiThreading/src/DemoThread.java‎

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class DemoThread {
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public static void main(String[] args) {
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A a = new A();
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B b = new B();
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a.start(); // starts thread A
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b.start(); // starts thread B
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}
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}
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class A extends Thread {
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public void run() {
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for (int i = 0; i < 10; i++) {
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System.out.println("From class A");
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}
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}
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}
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class B extends Thread {
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public void run() {
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for (int i = 0; i < 10; i++) {
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System.out.println("From class B");
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}
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}
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}

‎Section20JAVA.lang.Package/ClickLinks.cmd‎

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@echo off
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pushd "%~dp0"
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:MENU
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cls
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echo ===============================================
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echo Oracle Java Article - Reflection API
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echo ===============================================
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echo 1. Open Java Reflection Article
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echo 2. Exit
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echo.
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set /p choice=Enter your choice [1-2]:
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if "%choice%"=="1" start https://www.oracle.com/technical-resources/articles/java/javareflection.html & goto MENU
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if "%choice%"=="2" goto END
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echo.
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echo Invalid choice. Please select 1 or 2.
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pause
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goto MENU
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:END
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echo Goodbye!
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pause
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popd

‎Section20JAVA.lang.Package/src/WrapperClassesDemo.java‎

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public class WrapperClassesDemo
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{
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public static void main(String[] args)
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{
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//Some primitive types
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char letter = 'A';
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boolean value = true;
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int intNum = -269;
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double floatNum = Math.pow(2,2); // 2 to the 2 is 4
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//Converting them into objects via their wrapper classes
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Character Letter = (Character) letter;
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Boolean Value = (Boolean) value;
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Integer IntNum = (Integer) intNum;
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Double FloatNum = (Double) floatNum;
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//Wrapper objects print their value just fine
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System.out.println("" + Letter + " " + Value + " " + IntNum + " " + FloatNum);
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//Some Numerical objects
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Long Num1 = 987L;
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Float Num2 = 34.56f;
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//Turning them into primitive types
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long num1 = (long) Num1;
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float num2 = (float) Num2;
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System.out.println("" + num1 + " " + num2);
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}
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}

‎Section23JavaIOStreams/DemoCodes/DemoCodes.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="jdk" jdkName="openjdk-23" jdkType="JavaSDK" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎Section23JavaIOStreams/Section23JavaIOStreams.iml‎

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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="jdk" jdkName="openjdk-23" jdkType="JavaSDK" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎Section23JavaIOStreams/Serialisation Storing Data in a File/src/PrintInputStreamExample.java‎

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import java.io.*;
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class PrintInputStreamExample
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{
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public static void main(String[] args) throws Exception
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{
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FileInputStream fis=new FileInputStream("C:\\Users\\somes\\Downloads\\JAVA SE\\Section23JavaIOStreams\\Serialisation Storing Data in a File\\MyJAVA\\Student1.txt");
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class PrintInputStreamExample {
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public static void main(String[] args) throws Exception {
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FileInputStream fis = new FileInputStream("C:\\Users\\somes\\Downloads\\JAVA SE\\Section23JavaIOStreams\\Serialisation Storing Data in a File\\MyJAVA\\Student1.txt");
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BufferedReader br = new BufferedReader(new InputStreamReader(fis));
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// Creating a Student object

‎Section24JavaGenerics/src/Generics in Java introduce parameterized types.txt‎

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2. Type Safety: Generics make errors to appear compile time than at run time (It’s always better to know problems in your code at compile time rather than making your code fail at run time).
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Suppose you want to create an ArrayList that store name of students, and if by mistake the programmer adds an integer object instead of a string, the compiler allows it. But, when we retrieve this data from ArrayList, it causes problems at runtime.
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Suppose you want to create an ArrayList that store name of students, and if by mistake the programmer adds an integer object instead of a string, the compiler allows it. But, when we retrieve this data from ArrayList, it causes problems at runtime.
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In Java, generic type information is completely erased at runtime. This process is known as type erasure.
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The compiler replaces all type parameters in generic types with their bounds or Object if the type parameters
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are unbounded.
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This means that the bytecode after compilation contains only ordinary classes, interfaces, and methods.
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For example:
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```java
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List<String> stringList = new ArrayList<>();
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List<Integer> intList = new ArrayList<>();
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System.out.println(stringList.getClass() == intList.getClass()); // prints true
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```
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At runtime, both stringList and intList are just List objects, without any information about their generic type.
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This approach was chosen to maintain backward compatibility with pre-generics code.
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However, it also means that certain operations, like checking if an object is an instance of a specific generic type,
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are not possible at runtime.

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