Creation of methods

I have a only single class and its having only one method ie., main method only.... i need to develop another method that is to reduce my switching code

package org.bankPackage.one;

import java.util.Scanner; import java.lang.String;;

public class BankClass {

public static void main(String[] args) {

    String[] names={"sandeep","deepthi","srinivas","vinay"};
    String[] nums={"inc0001","inc0002","inc0003","inc0004"};
    int deposite=0,withdral=0,total=0,sub=0,req=0;
    int initial=500;
    String name="",num="",user="",dob="",mail="",mobi="";
    Scanner input =new Scanner(System.in);


    System.out.println("WELCOME TO INCRESOL BANK");
    System.out.println("");
    System.out.println("Enter your Request");
    System.out.println("\n1.Existing User\n2.New User");
    System.out.println("Enter your Request");
    String request=input.next();
    int reqst=Integer.parseInt(request);

    if (reqst==1)
    {

    System.out.print("User Name:");
    name=input.next();
    System.out.print("Account No:");
    num=input.next();

    if (((names[0].equals(name))&&(nums[0].equals(num)))||((names[1].equals(name))&&(nums[1].equals(num)))||((names[2].equals(name))&&(nums[2].equals(num)))||((names[3].equals(name))&&(nums[3].equals(num))))

    {

    System.out.println("");
    System.out.println("Your INCRESOL BANK ACCOUNT Details are");
    System.out.println("");

    System.out.println("A/c Holder Name:"+name);
    System.out.println("A/c Number:"+num);
    System.out.println("");

    System.out.println("Select any one of the following options");
    System.out.println("\n1.Available Balance\n2.Deposite\n3.Withdrawal\n4.Logout");
    System.out.println("Choose your choice :");
    req=input.nextInt();


    while(req<5)
    {           
        switch(req)
        {
            case 1: 

                System.out.println("");
                System.out.println("Your INCRESOL BANK ACCOUNT Details are");
                System.out.println("");

                System.out.println("A/c Holder Name:"+name);
                System.out.println("A/c Number:"+num);
                System.out.println("");

                System.out.println("Your Account Available Balance is:"+initial);

                System.out.println("\nSelect any one of the following options");
                System.out.println("\n1.Available Balance\n2.Deposite\n3.Withdrawal\n4.Logout");
                System.out.println("Choose your choice :");
                req=input.nextInt();
                break;

            case 2:

                System.out.println("");

                System.out.print("Enter Deposite Ammount:");
                deposite=input.nextInt();
                total=initial;
                total=initial+deposite;
                System.out.println("");
                System.out.println("After Deposite Current Ammount is:"+total);
                initial=total;
                System.out.println("\nSelect any one of the following options");
                System.out.println("\n1.Available Balance\n2.Deposite\n3.Withdrawal\n4.Logout");
                System.out.println("Choose your choice :");
                req=input.nextInt();
                break;

            case 3:

                System.out.println("");

                System.out.println("Enter Withdrawal Amount:");
                withdral=input.nextInt();
                sub=initial;
                sub=initial-withdral;
                initial=sub;
                System.out.println("");         
                System.out.println("After Withdrawal Current Ammount is :"+sub);

                System.out.println("\nSelect any one of the following options");
                System.out.println("\n1.Available Balance\n2.Deposite:\n3.Withdrawal:\n4.Logout");
                System.out.println("Choose your choice :");
                req=input.nextInt();
                break;

            case 4:

                System.out.println("your successfully Logged out");
            System.exit(req);
                break;

        } 

    }
}       
else
            System.out.println("\nYou enter wrong login details\nplease enter username and accountnumber\ndetails correctly");          
            input.close();

}   
else
    System.out.println("Please Enter Your Details Following Carefuuly");
    System.out.println("User Name:");
    user=input.next();
    System.out.println("Date of Birth:");
    dob=input.next();
    System.out.println("Mobile Number:");
    mobi=input.next();
    System.out.println("Email Id:");
    mail=input.next();

    System.out.println("Your detials are:\n"+user+"\n"+dob+"\n"+mobi+"\n"+mail);
    System.out.println("If you enter anything wrong u need to Re-Run");

} }