From dd2de9aef0dafff89a1f6700339bff76bd6fec56 Mon Sep 17 00:00:00 2001
From: HadiSharifi <sharifihadi002@gmail.com>
Date: Wed, 10 Jun 2026 07:41:45 +0330
Subject: [PATCH] update BanckAccount class

---
 src/main/java/dev/banking/model/BankAccount.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/dev/banking/model/BankAccount.java b/src/main/java/dev/banking/model/BankAccount.java
index 74b0ae0..265ec49 100644
--- a/src/main/java/dev/banking/model/BankAccount.java
+++ b/src/main/java/dev/banking/model/BankAccount.java
@@ -35,6 +35,7 @@ public class BankAccount {
     public void deposit(long amount) {
         lock.writeLock().lock();
         try {
+            if (amount < 0) throw new IllegalArgumentException("Amount cannot be negative");
             balance += amount;
         }
         finally {
@@ -45,6 +46,8 @@ public class BankAccount {
     public void withdraw(long amount) {
         lock.writeLock().lock();
         try {
+            if (amount < 0) throw new IllegalArgumentException("Amount cannot be negative");
+            if  (balance < amount) throw new IllegalArgumentException("insufficient balance");
             balance -= amount;
         }
         finally {
@@ -61,6 +64,8 @@ public class BankAccount {
         try {
             second.lock.writeLock().lock();
             try {
+                if (amount < 0) throw new IllegalArgumentException("Amount cannot be negative");
+                if (amount > balance) throw new IllegalArgumentException("insufficient balance");
                 this.balance -= amount;
                 target.balance += amount;
             } finally {