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Thread: Convert to OOP approach

  1. #1
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    Default 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!");
     
                }
        }


  2. #2
    Super Moderator jps's Avatar
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    Default Re: Convert to OOP approach

    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

  3. #3
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    Default Re: Convert to OOP approach

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

  4. #4
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    Default Re: Convert to OOP approach

    I don't know how to cook. Will you come over to my place every night and cook me dinner?

    I don't know how to play a musical instrument. After you have cooked my dinner will you play the guitar so I have some nice music to eat by?

    Or maybe I could learn!
    Improving the world one idiot at a time!

  5. #5
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    Default Re: Convert to OOP approach

    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 );
     
     
            }
    }

  6. #6
    Senior Member PhHein's Avatar
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    Default Re: Convert to OOP approach

    What is that line supposed to do in Delete?
    ar[j]=Integer.parseInt(br.nextLine());
    Other tings:
    - Stick to the coding conventions, method names are lower case.
    - shorten your main method, it should not contain more than a few lines of initialization code
    - use one method to get input as an Integer
    - make sure the user enters only Integers
    - use more than one class, your dynamic Array should be a seperate class.
    - never use System.exit(), it kills the VM not only your program

  7. The Following User Says Thank You to PhHein For This Useful Post:

    driczdc (August 28th, 2013)

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