intial commit

java_og/.classpath

+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

java_og/.gitignore

+/bin/

java_og/.project

+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>java_og</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>1736488099004</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>

java_og/.settings/org.eclipse.core.resources.prefs

+eclipse.preferences.version=1
+encoding/<project>=UTF-8

java_og/.settings/org.eclipse.jdt.core.prefs

+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=21
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=21

java_og/src/module-info.java

+/**
+ * 
+ */
+/**
+ * 
+ */
+module java_og {
+}
\ No newline at end of file

java_og/src/package_1/sclname.java

+package package_1;
+
+public class sclname {
+	public String scl_name="Model";
+	protected int scl_id=66;
+}

java_og/src/package_1/student.java

+package package_1;
+
+class  stu{
+	private String stu_name="Rajesh";
+	protected int age=21;
+	void disp() {
+		System.out.println(stu_name);
+	}
+}
+
+public class student {
+		public static void main (String[] args) {
+			stu obj=new stu();
+	//		System.out.println(obj.stu_name);  // it gives error bcz private variables only accessible within that class
+			obj.disp();           // but we can call it through function
+		}
+}

java_og/src/package_1/teacher.java

+package package_1;
+
+public class teacher {
+	public static void main(String[] args) {
+		stu obj=new stu();        // This is from student class       
+		obj.disp();
+		System.out.println(obj.age);  // This is Protected accessible within package
+	}
+}

java_og/src/package_2/abstract_exe.java

+package package_2;
+
+abstract class Animal{
+	abstract void makeSound();
+}
+class Dog extends Animal{
+	void makeSound() {
+		System.out.println("Dog Barks...");
+	}
+}
+class Cat extends Animal {
+	void makeSound() {
+		System.out.println("Cat Barks..");
+	}
+}
+
+public class abstract_exe {
+		public static void main(String[] args) {
+			Dog obj=new Dog();
+			Cat obj1=new Cat();
+			obj.makeSound();
+			obj1.makeSound();
+		}
+}

java_og/src/package_2/acess_modifier.java

+package package_2;
+
+class Person{
+	public String name;
+	protected int age;
+	private String socialSecurityNumber;
+	String address;
+	Person(String name,int age,String socialSecurityNumber,String address){
+		this.name=name;
+		this.age=age;
+		this.socialSecurityNumber=socialSecurityNumber;
+		this.address=address;
+	}
+	void disp2() {
+		System.out.print(socialSecurityNumber);
+	}
+}
+class Employee extends Person{
+	 Employee(String n,int a,String ssn,String add) {
+		super(n,a,ssn,add);
+		System.out.println("Hello Employees");
+	}
+	
+}
+
+public class acess_modifier {
+public static void main(String[] args) {
+	Employee obj=new Employee("Rajesh",21,"xyxx1","KKD");
+	System.out.print(obj.name+"-"+obj.age+"-"+obj.address+"-");
+	obj.disp2();
+}
+}

java_og/src/package_2/combined_exe.java

+package package_2;
+
+abstract class Vehicle{
+	abstract void drive(int a);
+	final void startEngine() {
+		System.out.println("Engine Strated");
+	}
+	static String getVehicleType(String fuel) {
+		if(fuel=="petrol") {
+			return "vehicle is motorcycle";
+		}
+		else {
+			return "Vehicle is Car";
+		}
+	}
+}
+
+class car extends Vehicle{
+	void drive(int a) {
+		System.out.println("car drives at--"+a+" k/h");
+	}
+} 
+class motorcycle extends Vehicle{
+	void drive(int a) {
+		System.out.println("MotorCycle drives at--"+a+" k/h");
+	}
+}
+
+public class combined_exe {
+public static void main(String[] args) {
+	car c1=new car();
+	c1.startEngine();
+	System.out.println(Vehicle.getVehicleType("petrol"));
+	c1.drive(65);
+	motorcycle m1=new motorcycle();
+	m1.startEngine();
+	System.out.println(Vehicle.getVehicleType("diesel"));
+	m1.drive(95);
+	
+}
+}

java_og/src/package_2/school.java

+package package_2;
+import package_1.sclname;            // From Other Package
+public class school extends sclname {
+	public static void  main(String[] args) {
+		sclname obj=new sclname();
+		System.out.println(obj.scl_name);	
+	//	System.out.println(obj.scl_id);      // It gives Error bcz the key was Protected
+		school obj1=new school();			// so we have to extend that class and create object for this class and we can access that					
+		System.out.println(obj1.scl_id);
+		
+	}
+}

java_og/src/package_2/static_ex.java

+package package_2;
+
+class Counter{
+	static int count=0;
+	int instancenum=0;
+	Counter(){
+		count=count+1;
+		instancenum=instancenum+1;
+	}
+	void disp() {
+		System.out.println("Static-" + count);
+		System.out.println("Instance-"+instancenum);
+	}
+}
+
+public class static_ex {
+
+	public static void main(String[] args) {
+		Counter obj=new Counter();
+		obj.disp();
+		Counter obj1=new Counter();
+		obj1.disp();
+		Counter obj2=new Counter();
+		obj2.disp();
+
+	}
+
+}