java Bank

import java.io.Serializable;
public class Bank implements Serializable{
private BankAccount[] accounts = new BankAccount[10];
//private int count=0;


public void addAccount(String name, String id, double balance) {
BankAccount ba = new BankAccount(name, id, balance);
addAccount(ba);
}


private void addAccount(BankAccount ba) {
int index = getLastIndex();
if(index>=0)
accounts[index] = ba;


}

public int getLastIndex() {
for(int i=0; i<accounts.length; i++) {
if(accounts[i] == null)
return i;
}

return -1;
}

public void deposit(String id, double amt) {
BankAccount ba = findAccount(id);
if(ba != null)
ba.deposit(amt);
}

public void withdraw(String id, double amt) {
BankAccount ba = findAccount(id);
if(ba != null)
ba.withdraw(amt);
}

public BankAccount findAccount(String id) {
for(int i=0; i<accounts.length; i++) {
if(accounts[i] == null)
return null;
if(accounts[i].id.equals(id))
return accounts[i];
}

return null;
}


public void display() {
for(int i=0; i<accounts.length; i++) {
if(accounts[i] == null)
break;
System.out.println(accounts[i]);
}
}
}