I am working on an exercise where i build a bank system, I created an account class, a client class and a bank class, however when I check the program I get:
Exception in thread "main" java.lang.NullPointerException.
Here are my classes:
package bank.elements;
public class Account {
private int id;
private float balance;
//constructors
public Account(int id, float balance){
this.setId(id);
this.setBalance(balance);
}
public Account (int id){
this.id=id;
this.setBalance(0);
}
//getters
public int getId(){
return this.id;
}
public float getBalance(){
return this.balance;
}
//setters
public void setBalance(float balance){
this.balance+=balance;
}
public void setId(int id){
this.id=id;
}
}
package bank.elements;
public class Client {
private int id;
private String name;
private String rank;
private float balance;
private Account[] accounts = new Account[100];
public Client(){
}
//getters
public int getId(){
return id;
}
public String getName(){
return name;
}
public String getRank(){
return rank;
}
public float getBalance(){
return balance;
}
public float getAccountBalance(int id){
float balance = 0;
for (int i = 0; i < accounts.length; i++) {
if(accounts[i].getId()==id){
balance = accounts[i].getBalance();
}
}
return balance;
}
public float getFortune(){
float sum = 0;
for (int i = 0; i < accounts.length; i++) {
sum+=getAccountBalance(i);
}
sum+=getBalance();
return sum;
}
//setters
public void setName(String name){
this.name = name;
}
public void setBalance(float balance){
this.balance+=balance;
}
public void setId(int id){
this.id=id;
}
public void addAccount(int id){
for (int i = 0; i < accounts.length; i++) {
if(accounts[i]==null){
accounts[i].setId(id);
}
}
}
}
package bank.elements;
public class Bank {
public Bank(){
}
public Client[] clients = new Client[100];
public float getBalance(){
float sum = 0;
for (int i = 0; i < clients.length; i++) {
sum+= clients[i].getFortune();
}
return sum;
}
public void addClient(){
for (int i = 0; i < clients.length; i++) {
if(clients[i] == null){
clients[i].setId(i);
}
}
}
public void removeClient(int id){
for (int i = 0; i < clients.length; i++) {
if(clients[i].getId()==id){
clients[i]=null;
for (int j = (i+1); j < clients.length; j++) {
clients[j] = clients[j-1];
}
}
}
}
}
And here is the Program thread:
package bank.program;
import bank.elements.Account;
import bank.elements.Client;
import bank.elements.Bank;
public class Program {
public static void main(String[] args) {
Bank b = new Bank();
b.addClient();
b.clients[0].setBalance(100);
b.clients[0].addAccount(2);
System.out.println(b.clients[0].getFortune());
}
}
What am I missing?