Question

(How do I remove the STATIC ArrayList from the public class Accounts, and move it to the MAIN?)

import java.util.ArrayList;
import java.util.Scanner;

public class Accounts {
static ArrayList<String> accounts = new ArrayList<>();
static Scanner scanner = new Scanner(System.in);
  
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
  
int option = 0;
do {
System.out.println("0->quit\n1->add\n2->overwirte\n3->remove\n4->display");
System.out.println("Enter your option");
option = scanner.nextInt();
if (option == 0) {
break;
} else if (option == 1) {
add();
} else if (option == 2) {
overwrite();
} else if (option == 3) {
remove();
} else if (option == 4) {
display();
} else {
System.out.println("Invalid option");
}
} while (true);
System.out.println("You Quit The Program!");
}//closes main method
  
  

public static void add() {
System.out.print("Enter acc no : ");
String number = scanner.next();
accounts.add(number);
}//closes add method
  
  

public static void overwrite() {
System.out.print("Enter acc no : ");
String number = scanner.next();
int accPos = -1;
for (int i = 0; i < accounts.size(); i++) {
if (accounts.get(i).equalsIgnoreCase(number)) {
accPos = i;
}
}
if (accPos == -1) {
System.out.println("No Account is present with given number");
return;
} else {
System.out.print("Enter new acc no : ");
String newAccNumber = scanner.next();
accounts.set(accPos, newAccNumber);
System.out.println("Successfully overwrite");
}
}//closes overwrite method

  
  
public static void remove() {
System.out.print("Enter acc no : ");
String number = scanner.next();
if (accounts.remove(number)) {
System.out.println("Successfully removed");
} else {
System.out.println("Account not present");
}
}//closes remove method

  
  
public static void display() {
System.out.println("Accounts :");
for (String number : accounts) {
System.out.println(number);
}
}//closes display method

}//closes Accounts class

Answer 1

//Accounts.java
import java.util.ArrayList;
import java.util.Scanner;

public class Accounts {
    static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        ArrayList<String> accounts = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);

        int option = 0;
        do {
            System.out.println("0->quit\n1->add\n2->overwirte\n3->remove\n4->display");
            System.out.println("Enter your option");
            option = scanner.nextInt();
            if (option == 0) {
                break;
            } else if (option == 1) {
                add(accounts);
            } else if (option == 2) {
                overwrite(accounts);
            } else if (option == 3) {
                remove(accounts);
            } else if (option == 4) {
                display(accounts);
            } else {
                System.out.println("Invalid option");
            }
        } while (true);
        System.out.println("You Quit The Program!");
    }//closes main method



    public static void add(ArrayList<String> accounts) {
        System.out.print("Enter acc no : ");
        String number = scanner.next();
        accounts.add(number);
    }//closes add method



    public static void overwrite(ArrayList<String> accounts) {
        System.out.print("Enter acc no : ");
        String number = scanner.next();
        int accPos = -1;
        for (int i = 0; i < accounts.size(); i++) {
            if (accounts.get(i).equalsIgnoreCase(number)) {
                accPos = i;
            }
        }
        if (accPos == -1) {
            System.out.println("No Account is present with given number");
            return;
        } else {
            System.out.print("Enter new acc no : ");
            String newAccNumber = scanner.next();
            accounts.set(accPos, newAccNumber);
            System.out.println("Successfully overwrite");
        }
    }//closes overwrite method



    public static void remove(ArrayList<String> accounts) {
        System.out.print("Enter acc no : ");
        String number = scanner.next();
        if (accounts.remove(number)) {
            System.out.println("Successfully removed");
        } else {
            System.out.println("Account not present");
        }
    }//closes remove method



    public static void display(ArrayList<String> accounts) {
        System.out.println("Accounts :");
        for (String number : accounts) {
            System.out.println(number);
        }
    }//closes display method

}//closes Accounts class

0-quit 1->add 2-xoverwirte 3-remove 4->display Enter your option Enter acc no1 0-xquit 1->add 2-xoverwirte 3-remove 4->display Enter your option Enter acc no 2 0-xquit 1->add 2-xoverwirte 3-remove 4->display Enter your option Accounts: 0-quit 1->add 2->overwirte 3-remove 4-display Enter your option You Quit The Program! Process finished with exit code 0

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