Thread: Convert to OOP approach

Hi guys, please help me to convert this code to OOP approach that that contains a method.
I hope someone will response . Thanks in advance

import java.io.*;
public class Project
    {
        public static void main(String args[])throws IOException
            {
                BufferedReader br=new BufferedReader(
                    new InputStreamReader(System.in));
                int ar[]=new int[100];
                int n,i,j,pos,ch;
                System.out.print("Enter number of element : ");
                n=Integer.parseInt(br.readLine());
                if(n<=99)
                    {
                        for(i=0;i<n;i++)
                            {
                                System.out.print("Enter any number : ");
                                ar[i]=Integer.parseInt(br.readLine());
                            }
                        do
                            {
                                System.out.println("1.Insert Element");
                                System.out.println("2.Delete Element");
                                System.out.println("3.Display Element");
                                System.out.println("4.Exit");
                                System.out.print("Enter your choice : ");
                                ch=Integer.parseInt(br.readLine());
                                switch(ch)
                                    {
                                        case 1:
                                            System.out.print("Enter position number : ");
                                            pos=Integer.parseInt(br.readLine())-1;
                                            if(pos<=n)
                                                {
                                                    for(j=n-1;j>=pos;j--)
                                                        ar[j+1]=ar[j];
                                                    System.out.print("Insert a new Element : ");
                                                    ar[j+1]=Integer.parseInt(br.readLine());
                                                    n++;
                                                }
                                            else
                                                System.out.println("Invalid Position");
                                            break;
                                        case 2:
                                            System.out.print("Enter position number : ");
                                            pos=Integer.parseInt(br.readLine())-1;
                                            if(pos<=n)
                                                {
                                                    for(j=pos;j<n;j++)
                                                        ar[j]=ar[j+1];
                                                    System.out.println("Element Deleted");
                                                    n--;
                                                }
                                            else
                                                System.out.println("Invalid Position");
                                            break;
                                        case 3:
                                            for(i=0;i<n;i++)
                                                System.out.print(ar[i]+"\t");
                                            System.out.println();
                                            break;
                                        case 4:
                                            System.out.println("Thank You!");
                                            System.exit(0);
                                            break;
                                        default:
                                            System.out.println(ch + " is not available at the choices");
                                            System.out.println("Please enter again!");
                                    }
                            }while(ch != 4 );
                    }
                else
                    System.out.println("Out of bound!");
 
            }
    }

Looks like homework to me.
Why don't you try it and see what you can come up with, or explain what problem you are facing

I don't know how .I'm a new in java

I'm finish to convert it to OOP approach .. but I have an other problem .. when I choice 2.Delete the program will exit.
Please tell me what to do ..
here's the code

import java.util.Scanner;
public class Project
{
    private int n = 0;
    private int pos = 0;
    private int ar[]=new int[100];
 
    public void setNum(int n){
        this.n = n;
    }
 
    public void setPos(int pos){
        this.pos = pos;
    }
 
    public int getPos(){
        return pos;
    }
 
    public int getNum(){
        Scanner br = new Scanner(System.in);
 
        if(n<=99){
            for(int i=0;i<n;i++){
                 System.out.print("Enter any number : ");
                 ar[i]=Integer.parseInt(br.nextLine());
            }                 
        }
        else
            System.out.print("Out of Bound!!");
        return n;
    }
 
    public void Insert(){
         Scanner br = new Scanner(System.in);
        int j;
        if(pos<=n)
        {
            for( j=n-1;j>=pos;j--)
                ar[j+1]=ar[j];
            System.out.print("Insert a new Element : ");
            ar[j+1]=Integer.parseInt(br.nextLine());
            n++;
 
        }
    else
        System.out.println("Invalid Position");
    }
 
    public void Delete(){
        Scanner br = new Scanner(System.in);
        int j;
        if(pos<=n)
        {
            for(j=pos;j<n;j++)
            ar[j]=ar[j+1];
            System.out.println("Element Deleted");
            ar[j]=Integer.parseInt(br.nextLine());
            n--;
        }
 
    else
        System.out.println("Invalid Position");
    }
 
    public void Display(){
        for(int i=0;i<n;i++)
        System.out.print(ar[i] + "\t");
    }
    public static void main(String args[])
        {
            Scanner br = new Scanner(System.in);
 
            int n,pos,ch;
            Project a = new Project();
            System.out.print("Enter number of element : ");
            n=Integer.parseInt(br.nextLine());
            a.setNum(n);
            a.getNum();
                    do
                        {
                            System.out.println("1.Insert Element");
                            System.out.println("2.Delete Element");
                            System.out.println("3.Display Element");
                            System.out.println("4.Exit");
                            System.out.print("Enter your choice : ");
                            ch=Integer.parseInt(br.nextLine());
                            switch(ch)
                                {
                                    case 1:
                                        System.out.print("Enter position number : ");
                                        pos=Integer.parseInt(br.nextLine())-1;
                                        a.setPos(pos);
                                        a.Insert();
                                        break;
                                    case 2:
                                        System.out.print("Enter position number : ");
                                        pos=Integer.parseInt(br.nextLine())-1;
                                        a.setPos(pos);
                                        a.Delete();
                                        break;
                                    case 3:
                                        a.Display();
                                        System.out.println();
                                        break;
                                    case 4:
                                        System.out.println("Thank You!");
                                        System.exit(0);
                                        break;
                                    default:
                                        System.out.println(ch + " is not available at the choices");
                                        System.out.println("Please enter again!");
                                }
                        }while(ch != 4 );
 
 
        }
}