Language: Java (code snippets)......

Compile
javac file.java
javac Hello.java 
Execute
java filename  
java Hello
--------------------------------------------------------------------------------------
The content of the script Hello.java
public class Hello{

     public static void main(String []args){
        System.out.println("Hello");
     }
}
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//Creation of objects from a Class (java file name is Kitty.java)
//package practice;
public class Kitty{

   public Kitty(String name){
      // Constructor having one parameter i.e. name.
      System.out.println("Given Pet Name is :" + name );
   }
 
   public static void main(String []args){
      // Following statement creates objects myKitty1, myKitty2
      Kitty myKitty1 = new Kitty( "Toy" );
      Kitty myKitty2 = new Kitty( "Beast" );
   }
   }
-----------------------------------------------
Given Pet Name is :Toy
Given Pet Name is :Beast

#################################

//File name is Employee.java
package practice;
import java.io.*;

public class Employee{

   String name;
   int age;
   String designation;
   String city;
   double salary;

   // This is the constructor of the class Employee
   public Employee(String name){
      this.name = name;
   }
   // Assign the age of the Employee  to the variable age.
   public void empAge(int empAge){
      age =  empAge;
   }
   /* Assign the designation to the variable designation.*/
   public void empDesignation(String empDesig){
      designation = empDesig;
   }
      /* Assign city to the variable designation.*/
   public void empCity(String empCity){
         city = empCity;
   }
   /* Assign the salary to the variable salary.*/
   public void empSalary(double empSalary){
      salary = empSalary;
   }
   /* Print the Employee details */
   public void printEmployee(){
      System.out.println("Name:"+ name );
      System.out.println("Age:" + age );
      System.out.println("Designation:" + designation );
      System.out.println("City:" + city );
      System.out.println("Salary:" + salary);
   }
}

//File name is EmployeeTest.java
package practice;
import java.io.*;

public class EmployeeTest{

   public static void main(String args[]){
      /* Create two objects using constructor */
      Employee empOne = new Employee("Carl");
      Employee empTwo = new Employee("Rhea");
      Employee empThree = new Employee("Jonas");

      // Invoking methods for each object created
   
      System.out.println("##################");
      empOne.empAge(26);
      empOne.empDesignation("Travel agent");
      empOne.empCity("Paris");
      empOne.empSalary(700);
      empOne.printEmployee();
   
      System.out.println("##################");
      empTwo.empAge(35);
      empTwo.empDesignation("Doctor");
      empTwo.empCity("Phoenix");
      empTwo.empSalary(500);
      empTwo.printEmployee();
   
      System.out.println("##################");
      empThree.empAge(48);
      empThree.empDesignation("Artist");
      empThree.empCity("Chicago");
      empThree.empSalary(200);
      empThree.printEmployee();
   }
}
-----------------------------------------------
##################
Name:Carl
Age:26
Designation:Travel agent
City:Paris
Salary:700.0
##################
Name:Rhea
Age:35
Designation:Doctor
City:Phoenix
Salary:500.0
##################
Name:Jonas
Age:48
Designation:Artist
City:Chicago
Salary:200.0

#################################

//Reduce variable number using keyword enum
//Script fle name is PizzaTest.java (the class name, not the super class name)
package practice;
class Pizza {

   enum PizzaPortion{ SMALL, MEDIUM, LARGE , VERY_LARGE}
   PizzaPortion portion;
}
public class PizzaTest {

   public static void main(String args[]){
      Pizza slice = new Pizza();
      slice.portion = Pizza.PizzaPortion.VERY_LARGE ;
      System.out.println("Portion: " + slice.portion);
   }
}
-----------------------------------------------
Portion: VERY_LARGE
#################################
//Accessing instance variables and methods
//File name is Toy.java
package practice;
public class Toy{
   int toyAge;
   public Toy(String name){
      // Constructor with one parameter, name.
      System.out.println("My toy dinosaur's name is:" + name );
   }
   public void setAge( int age ){
       toyAge = age;
   }
   public int getAge( ){
       System.out.println("It's age is " + toyAge );
       return toyAge;
   }
   public static void main(String []args){
      /* Object creation */
      Toy myToy = new Toy( "Rex" );                  
      /* Call class method to set age */
      myToy.setAge( 12 );
      /* Call another class method to get age */
      myToy.getAge( );
      /* Accessing instance variable*/
      System.out.println("I bought it " + myToy.toyAge + " years back" );
      System.out.println("Its cost was $10." );
   }
}
-----------------------------------------------
My toy dinosaur's name is:Rex
It's age is 12
I bought it 12 years back
Its cost was $10.
#################################