public class HelloWorld{
    
    public static void main(String[] args){
           System.out.println("Hello World !");
           System.out.println(" اهلا و سهلا  !");
    }
}

class Employee{
    public String name;
    public int salary;
    
    public Employee(){}
    
    public Employee(String aName, int aSalary){
        name=aName;
        salary=aSalary;
    }
    
    public void raiseSalary(int rate){
        salary=salary+salary*rate/100;
    }
    
}

public class EmployeeTest{
    
    public static void main(String[] args){
        Employee thierry=new Employee();
        thierry.name="Thierry Coulbois";
        thierry.salary=1000;
        thierry.raiseSalary(10);
        System.out.println(thierry.name+"'s salary is "+thierry.salary);
        Employee rais=new Employee("ساري نسيبه",2000);
        System.out.println("The president is "+rais.name);
    }
}

/** An Employee up to now has a name and a salary.
    The Employee class is better than the previous 
    version, because the fields are private, and you 
    have mutators and accessors. */
class Employee{
    private String name; //no need to write documentation for these fields they are private.
    private int salary;
    
    /** The default constructor */
    public Employee(){}
    
    /** The correct constructor that set the name and the salary.
    */
    public Employee(String aName, int aSalary){
        name=aName;
        salary=aSalary;
    }
    

    /** Accessor to the name field. */    
    public String getName(){
        return name;
    }
    
    /** Accessor to the salary field. */
    public int getSalary(){
        return salary;
    }
    
    /** Mutator of the name field. */
    public void setName(String aName){
        name=aName;
    }
    
    /** Mutator of the salary field. */
    public void setSalary(int aSalary){
        salary=aSalary;
    }
    
    /** Raise the salary by rate percent. */
    public void raiseSalary(int rate){
        salary=salary+salary*rate/100;
    }
    
}

/** Tests our Employee class version 2.*/
public class EmployeeTest{
    
    /** Create two employees and rase the salary of one of them. */
    public static void main(String[] args){
        Employee thierry=new Employee();
        thierry.setName("Thierry Coulbois"); //we have to use the mutators
        thierry.setSalary(1000);
        thierry.raiseSalary(10);
        System.out.println(thierry.getName()+"'s salary is "+thierry.getSalary()); //we have to use the accessors
        Employee rais=new Employee("ساري نسيبه",2000);
        System.out.println("The president is "+rais.getName());
    }
}

/** An Employee has a name and a salary and an identity number.
    The Employee class is better than the previous 
    version, because the fields are private, and you 
    have mutators and accessors. 
    @version 3*/
class Employee{
    private String name; //no need to write documentation for these fields they are private.
    private int salary;
    private final int idNumber; //the identity number of an employee cannot be modified : it is final.
    
    private static int nextIdNumber=1; //this is a class field that is initialized with 1.
    
    /** The default constructor */
    public Employee(){
        idNumber=nextIdNumber;
        nextIdNumber++;
    }
    
    /** The correct constructor that set the name and the salary.
    */
    public Employee(String aName, int aSalary){
        this();    //We first execute the Employee() constructor to set the identity number.
        name=aName;
        salary=aSalary;
    }
    

    /** Accessor to the name field. */    
    public String getName(){
        return name;
    }
    
    /** Accessor to the salary field. */
    public int getSalary(){
        return salary;
    }
    
    /** Accessor ot the identity number field. */
    public int getIdNumber(){
        return idNumber;
    }
    
    /** Mutator of the name field. */
    public void setName(String aName){
        name=aName;
    }
    
    /** Mutator of the salary field. */
    public void setSalary(int aSalary){
        salary=aSalary;
    }
    
    /** Raise the salary by rate percent. */
    public void raiseSalary(int rate){
        salary=salary+salary*rate/100;
    }
    
    /** Accessor for the next identity number. */
    public static int getNextIdNumber(){
        return nextIdNumber;
    }
    
}


/** Tests our Employee class 
@version 3*/
public class EmployeeTest{
    
    /** Create two employees and rase the salary of one of them. */
    public static void main(String[] args){
        Employee thierry=new Employee();
        thierry.setName("Thierry Coulbois"); //we have to use the mutators
        thierry.setSalary(1000);
        thierry.raiseSalary(10);
        System.out.println(thierry.getName()+" ("+thierry.getIdNumber()+")'s salary is "+thierry.getSalary()); //we have to use the accessors
        Employee rais=new Employee("ساري نسيبه",2000);
        System.out.println("The president (number : "+rais.getIdNumber()+") is "+rais.getName());
        System.out.println("The next employee will have identity number : "+Employee.getNextIdNumber());
    }
}