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Core Java. Envelop for simple data base that uses ArrayLIst container ( Enum may be )

Posted on 2016-07-27
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Last Modified: 2016-07-30
I would like to make a simple project that modulate the database request - response action. The presented below code work fine. However, I would like to make some envelop for my employee database in order to avoid to place it in main function. I thought about Enum class but encounter in some compile error. Moreover, I don't even know does it possible to make Enum work in this way. If not please give me an idea what fit best for my purpose. Thanks in advance dear Experts !

package TaskCh;
import java.util.ArrayList;
import java.util.Calendar;

/**

 */

//********** ************************************************************
 class SearchEngine {

   

    public void searchRequest(ArrayList<Employee> db, int numberOfyears) {
        for (Employee item : db) {
            if (item.getYearsOfWork() >= numberOfyears) {           	
            	item.getRequestedInformation();
            }
        }
    }

}
//********** ************************************************************

//********** ************************************************************

 class Employee { 	// Class Employee // start 
	 
    private String firstName;
    private String middleName;
    private String familyName;
    private String address;
    private int yearOfstart;
    private int monthOfstart;


    // The constructor of the class // starts
    Employee (String firstName,
    		  String middleName,
    		  String familyName,
              String address,
              int yearOfstart,
              int monthOfstart) {
        this.familyName 	= familyName;
        this.firstName 		= firstName;
        this.middleName 	= middleName;
        this.address 		= address;
        this.yearOfstart 	= yearOfstart;
        this.monthOfstart 	= monthOfstart;
    }
    
    // Second constructor ( in case of if middle name's absents )
    Employee (	   
    		String firstName,
    		String familyName,
            // missing middle name of an employee
            String address,
            int yearOfstart,
            int monthOfstart) 
    {
    	this.familyName 	= familyName;
        this.firstName 		= firstName;
        this.address 		= address;
        this.yearOfstart 	= yearOfstart;
        this.monthOfstart 	= monthOfstart;
    }
    
    // The constructor of the class // ends 

    
    //  Implementation of getters methods  // Start 
    public String getFirstName() {
        return firstName;
    }
    
    public String getMiddleName() {
        if (middleName == null) {
            return "";
        } else {
            return middleName;
        }
    }
    
    public String getFamilyName() {
        return familyName;
    }

    

    public String getAddress() {
        return address;
    }


    public int getYearOfStart() {
        return yearOfstart;
    }


    public int getMonthOfStart() {
        return monthOfstart;
    }
    
   

    // Implementation of getters methods //  ends  


    // Business logic // Start 
    
    //  method for calculation of beginning of a career in a company
    
    public int getYearsOfWork () {
        Calendar c = Calendar.getInstance();
        if ( (monthOfstart - 1) <= c.get(Calendar.MONTH) ) {
            return c.get(Calendar.YEAR) - yearOfstart;
        } else {
            return c.get(Calendar.YEAR) - yearOfstart - 1;
        }
    }
    
    public void getRequestedInformation() {
    	System.out.printf ( "\nFull name : %s " ,this.getFirstName()) ;
    	System.out.printf ( "%s " ,this.getMiddleName()) ;
    	System.out.printf ( "%s " ,this.getFamilyName()) ;
    	System.out.printf ( "\nAddress : %s" ,this.getAddress()) ; 
    	System.out.printf ( "\nstart date ( yyyy/mm ) : %s" ,this.getYearOfStart()) ;
    	System.out.printf ( " / %s" ,this.getMonthOfStart()) ;
    	System.out.println("\n\n *** next employee");
      }
    // Business logic // ends  
    
}	// Class Employers //  ends 
// ********** ************************************************************

// 	 enum EmpoyeeDataBase {
//	  
// 	ArrayList<Employee> empoyeeDataBase = new ArrayList<>();
// 	
// 	 empoyeeDataBase.add(new Employee("Jack", "Dorsy","USA, CA, San-Francisco", 2008, 11));
//     empoyeeDataBase.add(new Employee("Barack", "Obama","USA, DC, Washington", 2016, 12));
//     empoyeeDataBase.add(new Employee("Larry ", "Page","USA, CA, San-Francisco", 2015, 10));
//     empoyeeDataBase.add(new Employee("Sergey ","Brin","USA, CA, San-Francisco", 2014, 10));
//     empoyeeDataBase.add(new Employee("Elon", "Musk","USA, CA, Los_Angeles", 2013, 8));		// Works almost 3 years 
//     empoyeeDataBase.add(new Employee("Pavel","M.", "Durov","Russia, Saint-Petersburg", 2012, 12));
//     empoyeeDataBase.add(new Employee("Dmitriy", "V.", "Medvedev","Russia", 2015, 10));
//	  
//  }
 
 

public class TaskCh {
    public static void main(String[] args) {

        // ArrayList of Employee type
        ArrayList<Employee> empoyeeDataBase = new ArrayList<>();

        // Fill ArrayList
        empoyeeDataBase.add(new Employee("Jack", "Dorsy","USA, CA, San-Francisco", 2008, 11));
        empoyeeDataBase.add(new Employee("Barack", "Obama","USA, DC, Washington", 2016, 12));
        empoyeeDataBase.add(new Employee("Larry ", "Page","USA, CA, San-Francisco", 2015, 10));
        empoyeeDataBase.add(new Employee("Sergey ","Brin","USA, CA, San-Francisco", 2014, 10));
        empoyeeDataBase.add(new Employee("Elon", "Musk","USA, CA, Los_Angeles", 2013, 8));		// Works almost 3 years 
        empoyeeDataBase.add(new Employee("Pavel","M.", "Durov","Ukraine, Kiev", 2012, 12));
        empoyeeDataBase.add(new Employee("Dmitriy", "V.", "Medvedev","Ukraine , Lviv", 2015, 10));

        // For each in "a" (print -> not less than 3 years of work)
        System.out.println("Information about Employees who works more than 3 years : ");
        SearchEngine yearRequest = new SearchEngine();
        yearRequest.searchRequest(empoyeeDataBase, 3);
        
        
   
    }
}

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Question by:SunnyX
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2 Comments
 
LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 50 total points
ID: 41731556
Since you're learning still, see
http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html

This will show you how enum has no connection at all with your goal - but you need to know about them anyway
1
 
LVL 9

Accepted Solution

by:
Moussa Mokhtari earned 450 total points
ID: 41731669
I think the best way to do it is to create a class not enum
that class contains a method that when you call it from main it will add your employees for you .
package TaskCh;
import java.util.ArrayList;
import java.util.Calendar;


//********** ************************************************************
 class SearchEngine {

    public void searchRequest(ArrayList<Employee> db, int numberOfyears) {
        for (Employee item : db) {
            if (item.getYearsOfWork() >= numberOfyears) {           	
            	item.getRequestedInformation();
            }
        }
    }

}
//********** ************************************************************


//********** ************************************************************

 class Employee { 	// Class Employee // start 
	 
    private String firstName;
    private String middleName;
    private String familyName;
    private String address;
    private int yearOfstart;
    private int monthOfstart;


    // The constructor of the class // starts
    Employee (String firstName,
    		  String middleName,
    		  String familyName,
              String address,
              int yearOfstart,
              int monthOfstart) {
        this.familyName 	= familyName;
        this.firstName 		= firstName;
        this.middleName 	= middleName;
        this.address 		= address;
        this.yearOfstart 	= yearOfstart;
        this.monthOfstart 	= monthOfstart;
    }
    
    // Second constructor ( in case of if middle name's absents )
    Employee (	   
    		String firstName,
    		String familyName,
            // missing middle name of an employee
            String address,
            int yearOfstart,
            int monthOfstart) 
    {
    	this.familyName 	= familyName;
        this.firstName 		= firstName;
        this.address 		= address;
        this.yearOfstart 	= yearOfstart;
        this.monthOfstart 	= monthOfstart;
    }
    
    // The constructor of the class // ends 

    
    //  Implementation of getters methods  // Start 
    public String getFirstName() {
        return firstName;
    }
    
    public String getMiddleName() {
        if (middleName == null) {
            return "";
        } else {
            return middleName;
        }
    }
    
    public String getFamilyName() {
        return familyName;
    }

    

    public String getAddress() {
        return address;
    }


    public int getYearOfStart() {
        return yearOfstart;
    }


    public int getMonthOfStart() {
        return monthOfstart;
    }
    
   

    // Implementation of getters methods //  ends  


    // Business logic // Start 
    
    //  method for calculation of beginning of a career in a company
    
    public int getYearsOfWork () {
        Calendar c = Calendar.getInstance();
        if ( (monthOfstart - 1) <= c.get(Calendar.MONTH) ) {
            return c.get(Calendar.YEAR) - yearOfstart;
        } else {
            return c.get(Calendar.YEAR) - yearOfstart - 1;
        }
    }
    
    public void getRequestedInformation() {
    	System.out.printf ( "\nFull name : %s " ,this.getFirstName()) ;
    	System.out.printf ( "%s " ,this.getMiddleName()) ;
    	System.out.printf ( "%s " ,this.getFamilyName()) ;
    	System.out.printf ( "\nAddress : %s" ,this.getAddress()) ; 
    	System.out.printf ( "\nstart date ( yyyy/mm ) : %s" ,this.getYearOfStart()) ;
    	System.out.printf ( " / %s" ,this.getMonthOfStart()) ;
    	System.out.println("\n\n *** next employee");
      }
    // Business logic // ends  
    

}	// Class Employers //  ends 
// ********** ************************************************************

	 class EmpoyeeDataBase {
	  
	ArrayList<Employee> empoyeeDataBase = new ArrayList<>();
	
	public void addEmployee(Employee emp){
		empoyeeDataBase.add(emp);
	}
	public void addDefaultList(){
	empoyeeDataBase.add(new Employee("Jack", "Dorsy","USA, CA, San-Francisco", 2008, 11));
    empoyeeDataBase.add(new Employee("Barack", "Obama","USA, DC, Washington", 2016, 12));
    empoyeeDataBase.add(new Employee("Larry ", "Page","USA, CA, San-Francisco", 2015, 10));
    empoyeeDataBase.add(new Employee("Sergey ","Brin","USA, CA, San-Francisco", 2014, 10));
    empoyeeDataBase.add(new Employee("Elon", "Musk","USA, CA, Los_Angeles", 2013, 8));		// Works almost 3 years 
    empoyeeDataBase.add(new Employee("Pavel","M.", "Durov","Russia, Saint-Petersburg", 2012, 12));
    empoyeeDataBase.add(new Employee("Dmitriy", "V.", "Medvedev","Russia", 2015, 10));
	}
	
	public ArrayList<Employee> getDataBase(){
	  return empoyeeDataBase;
    }
	}
 
 

public class TaskCh {
    public static void main(String[] args) {

      EmpoyeeDataBase employeedb = new EmpoyeeDataBase();
      employeedb.addDefaultList();
     
        // For each in "a" (print -> not less than 3 years of work)
       System.out.println("Information about Employees who works more than 3 years : ");
       SearchEngine yearRequest = new SearchEngine();
       yearRequest.searchRequest(employeedb.getDataBase(), 3);
        
        
   
    }
}

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