Getting compile errors!!!

package Bank;

import java.io.*;

public class Bank
{
	
	/*arrays created and initialised*/
	Array accountList[] = new Array[21];
	Array costumerList[] = new Array[21];
	
	public String bankName = "The World Ban''K''";
	
	/*public SavingsAccount (String ACCOUNTNUMBER)
 	{
 	
	
	}*/
	
	
	
	
public void bankName(String bankName)
    {
    	this.bankName = bankName;
    }
    
/*accessor method*/
public void getBankName()
    {
    	return bankName;
    }
    
    
/*public String getAccounts(accountList[]) 
    {
		
			for (int i=0;i<=20;i++)
			{
			
				return accountList[i];
		
			}
	}
	
public String getCustomers(costumerList[]) 
    {
		
			for (int i=0;i<=20;i++)
			{
			
				return costumerList[i];
		
			}
	}*/
    
    
/*mutator methods*/
public void creditAccount()
    {
    	balance = balance + credit;
    }
    
public void debitAccount()
    {
    	
    	if(balance >= 0){
    	
    						balance = balance - debit;
    	
    	  				}
    }
/*accessor/print method*/
public void printCustomers() {

	for (int i=0;i<=20;i++)
			{
			
				System.out.println(costumerList[i]);
		
			}
	
			
		}
		
public void printAccounts() {

	for (int i=0;i<=20;i++)
			{
			
				System.out.println(accountList[i]);
		
			}
	
			
		}
		
	
	
/*public void printAccountCostumer() {

	for (int i=0;i<=20;i++)
			{
			
				System.out.println(costumerList[] + accountList[i]);
		
			}
	
			
		}*/
		
public static void tui() {

		System.out.println("welcome to The Ban''K'''s database");
		System.out.println("\n Please select from the available options \n");
		
		System.out.println(" 1. View existing accounts");
		System.out.println(" 2. View existing account holders");
		System.out.println(" 3. View existing accounts and their ownerships");
		System.out.println(" 4. Search for a costumer");
		System.out.println(" 5. Add a new costumer and create a new account for them");
		System.out.println(" 6. Exit system");
		

	}
	
	public static void main(String[] args) {
		
		
	
	char choice = '0';
	
			do {
			showMenu();

			
			try {
				
				choice = (char) System.in.read();
				
				} catch (IOException e) {
				
				
			}
			
			switch (choice) {
			
			
			
			case '1':
				printAccounts();
				break;
			
			case '2':
				printAccountHolders();
				break;
			
			case '3':
				printAccountAndOwnership();
				break;
			
			case '4':
				System.out.println("Input the costumer's costumer ID");
				printAccountHolder();
				break;
			
			case '5':
				createAccount();
				break;
			
			case '6':
			system.exit(0);
				break;
				
			

			}

		} while(choice >'0' && (choice < '7');
	
	
	}
		
	

public String toString()
 		{
 			return "Account number: " + ACCOUNTNUMBER + "Account holder: " +
 			ACCOUNTHOLDER + " Account balance: " + balance + " Interest rate: "
 			+ interestRate;
 		}
 		}

Array accountList[] = new Array[21];
Array costumerList[] = new Array[21];