Thread: What should I snip off of this code?

Hey! I was wondering which part of this code should be snipped to JUST have the barcode maker?

import java.util.Scanner;
 
public class postal
{
    /**
        Here is a constructor
    */
    public int num2;    // 10000 digit
    public int num3;    // 1000 digit
    public int num4;    // 100 digit
    public int num5;    // 10 digit
    public int num6;    // 1 digit
    public int checkDig; // check digit
    public static int num;
    public static String temp;
    public static int menu;
    public static int zip;
    public static String bar0;
    public static String bar1;
    public static String bar2;
    public static String bar3;
    public static String bar4;
    public static String bar5;
    public static String bar6;
    public static String bar7;
    public static String bar8;
    public static String bar9;
    public static String str;
    public static int numb;
 
    public postal()
    {
        zip = 0;
        /**
            bar code 
        */
        bar0 = "::..."; bar1 = "...::"; bar2 = "..:.:";
        bar3 = "..::."; bar4 = ".:..:"; bar5 = ".:.:.";
        bar6 = ".::.."; bar7 = ":...:"; bar8 = ":..:.";
        bar9 = ":.:..";
 
    }
 
    public static int getZIP()
    {
        System.out.println("Enter a ZIP code : ");
        Scanner sc = new Scanner(System.in);
        zip = sc.nextInt();
        while((zip<01001)||(zip>99950))
        {
            System.out.println("**** ERROR ****");
            System.out.println("The ZIP code must be between 01001 and 99950");
            System.out.println("Please,enter the correct zip : ");
            zip = sc.nextInt();
        }
        return zip;
    }
    public static int menu()
    {
        System.out.println("**** Barcode maker / reader ****");
        System.out.println("Choose one option from following : ");
        System.out.println("1) Create ZIP barcode ");
        System.out.println("2) Find ZIP code from barcode ");
        System.out.println("3) Exit ");
        Scanner sc = new Scanner(System.in);
        return sc.nextInt();
    }
 
    public void getDigit(int num)
    {
        num2 = num/10000;
        num3 = ((num/1000)-num2*10);
        num4 = (num/100 - (num2*100 + num3*10));
        num5 = (num/10 -(num2*1000 + num3*100 + num4*10));
        num6 = (num - (num2*10000 + num3*1000 + num4*100 + num5*10));
        // error here; need to use correct formula
        checkDig = 100- (num2+num3+num4+num5+num6);
        System.out.println(checkDig);
 
        while(checkDig>10)
        {   checkDig -= 10; }
        System.out.println("**** BARCODE ****");
        getBar(num2);
        getBar(num3);
        getBar(num4);
        getBar(num5);
        getBar(num6);
        getBar(checkDig);
 
    }
    public void getBar(int x)
    {
 
        switch(x)
        {
            case 0: System.out.print(bar0); break;
            case 1: System.out.print(bar1); break;
            case 2: System.out.print(bar2); break;
            case 3: System.out.print(bar3); break;
            case 4: System.out.print(bar4); break;
            case 5: System.out.print(bar5); break;
            case 6: System.out.print(bar6); break;
            case 7: System.out.print(bar7); break;
            case 8: System.out.print(bar8); break;
            case 9: System.out.print(bar9); break;
        }
    }
    public static String number()
    {
        System.out.println("Enter a barcode with using . or : ");
        Scanner scn = new Scanner(System.in);
        String bar = scn.nextLine();
        return bar;
    }
 
    public static void getNumber(String temp)
    {
        System.out.println("*** In a getNUmber ***");
        System.out.println(temp);
        if(temp.equals(bar0))
        {  numb = 0; }
        if(temp.equals(bar1))
        {  numb = 1; }
        if(temp.equals(bar2))
        {  numb = 2; }
        if(temp.equals(bar3))
        {  numb = 3; }
        if(temp.equals(bar4))
        {  numb = 4; }
        if(temp.equals(bar5))
        {  numb = 5; }
        if(temp.equals(bar6))
        {  numb = 6; }
        if(temp.equals(bar7))
        {  numb = 7; }
        if(temp.equals(bar8))
        {  numb = 8; }
        if(temp.equals(bar9))
        {  numb = 9; }
        System.out.print(numb);
    }
    public static void devide(String temp)
    {
        postal po = new postal();
        str = temp.substring(0,4);
        System.out.println(str);
        po.getNumber(str);
        str = temp.substring(5,9);
        System.out.println(str);
        po.getNumber(str);
        str = temp.substring(10,14);
        System.out.println(str);
        po.getNumber(str);
        str = temp.substring(15,19);
        System.out.println(str);
        po.getNumber(str);
        str = temp.substring(20,24);
        System.out.println(str);
        po.getNumber(str);
 
    }
 
    public static void main(String[] args)
    {
        postal pos = new postal();
        while(menu != 3)
        {
            System.out.println();
            menu = pos.menu();      
            switch (menu)
            {
                case 1: 
                    num = pos.getZIP();
                    pos.getDigit(num);
                    System.out.println();
                    break;
                case 2:
                    temp = pos.number();
                    System.out.println(temp);
                    pos.devide(temp);
                    break;
                case 3:    
                    break;
            }
        }   
    }
}

while( zip < 01001 && zip > 99950 ) //You should use ampersands instead of bars because your saying its less than and greater than. 
        {
            System.out.println("**** ERROR ****");
            System.out.println("The ZIP code must be between 01001 and 99950");
            System.out.println("Please,enter the correct zip : ");
            zip = sc.nextInt();
        }

He wants it to mean less than or greater than. (I would remove the leading 0 in 01001)

--- Update ---

Start with the main method and see where it's calling the method that does the other things. I believe the bar-code interpreter method is called 'devide'.

You also have to remove the other options from the menu. You can either disable them or just remove that particular function. Comment things out one thing at a time, so it doesn't stop working altogether.