how to use arraylist - arraylist example

here i am going to write a program which shows example of arraylist.
think in this case that i am using arraylist to associate each
student with courses taken.

arraylists are used for collection type purposes.so it is used
widely.

program codes are following-
public class Course
    {
        private string name;
        public string Name
        {
            get { return name; }
            //set { name = value; }
        }
        public Course(string name) {
            this.name = name;
        }
        public string Output()
        {
             return "Course Name : "+ name + " ";
        }
    }
public class Student
    {
        private string name;
        public string Name
        {
            get { return name; }
        }
        private ArrayList courseTaken = new ArrayList();
        public ArrayList CourseTaken
        {
            get { return courseTaken; }
            //set { courseTaken = value; }
        }      
        public Student(string name) {
            this.name = name;      
        }
        public string Output() {
            return "Student Name : "+ name + "\n";
        }
    }
here is the entry form::
public partial class MridulExampleUi : Form
    {
        public MridulExampleUi()
        {
            InitializeComponent();
        }      
        private void MridulExampleUi_Load(object sender, EventArgs e)
        {}
        private void ShowArraylistButton_Click(object sender, EventArgs e)
        {       
            Student studentObj = new Student("mridul");
            Student studentObj3 = new Student("someone");
            Course courseObj1 = new Course("Programming");
            Course courseObj2 = new Course("Web designing");                
            studentObj.CourseTaken.Add(courseObj1);
            studentObj.CourseTaken.Add(courseObj2);
            studentObj3.CourseTaken.Add(courseObj1);         
            ArrayList arrayObj = new ArrayList();
            arrayObj.Add(studentObj);
            arrayObj.Add(studentObj3);          

            string message="";
            foreach (Student studentObj2 in arrayObj)
            {
                message+=studentObj2.Output();
                foreach(Course courseObj3 in studentObj2.CourseTaken)
                {
                  message+=courseObj3.Output();\                     
                }
                message += "\n\n";
            }
            MessageBox.Show(message);          
        }}
here is the program entry class::
static class Program
    {
        ///

        /// The main entry point for the application.
        ///

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MridulExampleUi());
        }
    }

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executing parameterless base constructor for initializing some attributes of base class

Suppose you have a bank account class.from which you will generate
two classes-savings account & checking account.each one has other
attributes besides common base class attributes.

suppose common 'balance' attribute of base class needed to be
initialized to 0 then you will do that by the base  parameterless
constructor of the base class as the following way -

public abstract class BankAccount
    {
        private string accountNumber;
        private string customerName;
        private double balance;

        public BankAccount(string accountNumber, string customerName) : this()
        {
            this.accountNumber = accountNumber;
            this.customerName = customerName;
        }
       
       // here is the first constructor for initializing balance

        public BankAccount()
        {
            this.balance = 0;
        }
}

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An example of how objects can be used to program applications perfectly

Here i am going to write a program.I wrote it by my own
please do not copy.It shows that how applications can be
implemented easily with Objects-



# MridulFruitBusiness applications-

1.It will create a bucket owner with the owner name & the number
of flowers he/she can keep.
2.then he/she can keep in/keep out the flowers in the bucket by selecting
radiobuttons and entering the number of flowers to keep/keepout seperately.
3.if he/she clicks status button at the bottom the overall status will
be shown about how many flowers in the bucket and how many he/she can keep.

#here is the bucket class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MridulFruitsBusiness
{
    public class Bucket
    {
        private string ownerName;

        public string OwnerName
        {
            get { return ownerName; }
            set { ownerName = value; }
        }
        private int numberItems;
        public int NumberItems
        {
            get { return numberItems; }
            set { numberItems = value; }
        }
        public Bucket(string ownerName,int numberItems) {
            this.ownerName = ownerName;
            this.numberItems = numberItems;       
        }
    }
}

#the fruits keeper class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MridulFruitsBusiness
{
    public class FruitsKeeper
    {
       
        public string KeepFruits(int value, int keepValue,int keptValue, Bucket bucketObj)
        {
          
            if (value == 1)
            {
                if (bucketObj.NumberItems < keepValue)
                {
                    return "sorry u try to keep more fruits than the number of flowers";
                }
                else
                {                                                       
                    return "u kept " + keepValue.ToString() + " fruits\nu can keep more " + (bucketObj.NumberItems - keepValue).ToString() + " fruits";

                }
             }

            if (value == 2)
            {                                             
                return keepValue.ToString()+" fruits kept out of the bucket\n"+keptValue.ToString()+" fruits remaining";
            }
            else
            {
                return "no data";
            }
           
        }
    }
}

#starting point class of the program
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace MridulFruitsBusiness
{
    static class Program
    {
        ///

        /// The main entry point for the application.
        ///

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MridulFormUi());
        }
    }
}
#here is the User interface class(the main part)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace MridulFruitsBusiness
{
    public partial class MridulFormUi : Form
    {
        private Bucket bucketObj = null;
        private int keptValue=0;
        public MridulFormUi()
        {
            InitializeComponent();
        }

        private void gardenerForm_Load(object sender, EventArgs e)
        {

        }       
        private void submitButton_Click(object sender, EventArgs e)
        {
            bucketObj=new Bucket(ownerTextBox.Text,Convert.ToInt16(itemsTextBox.Text));
           
            MessageBox.Show(" bucket created");
        }
        ///

        /// for keeping
        ///

        ///

        ///
        private void keepButton_Click(object sender, EventArgs e)
        {
           
            FruitsKeeper keeperObj = new FruitsKeeper();
            int value=0;
            int keepValue = Convert.ToInt16(keepTextBox.Text);
            if (radioButton1.Checked == true)
            {              
                value = 1;
                keptValue = keepValue;
                MessageBox.Show(keeperObj.KeepFruits(value,keepValue,keptValue,bucketObj));
            }
            if (radioButton2.Checked == true)
            {
                value = 2;
                keptValue = keptValue - keepValue;
                MessageBox.Show(keeperObj.KeepFruits(value, keepValue,keptValue,bucketObj));
            }           
        }
        private void statusButton_Click(object sender, EventArgs e)
        {
            MessageBox.Show("you kept " + keptValue.ToString() + " fruits out of " + bucketObj.NumberItems.ToString());
        }
    }
}

if can't implement-comments are most welcome.good day...

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