From dc803b0ef51898139783a3d0ab49223d8494e936 Mon Sep 17 00:00:00 2001
From: Kamal Wickramanayake <kamal@inbox.lk>
Date: Sat, 14 Feb 2026 16:37:45 +0530
Subject: Added 06-simple-objects-better code

---
 java/06-simple-objects-better/.gitignore          |  1 +
 java/06-simple-objects-better/Account.java        | 26 +++++++++++++++
 java/06-simple-objects-better/AccountApp.java     | 16 ++++++++++
 java/06-simple-objects-better/AccountManager.java | 39 +++++++++++++++++++++++
 4 files changed, 82 insertions(+)
 create mode 100644 java/06-simple-objects-better/.gitignore
 create mode 100644 java/06-simple-objects-better/Account.java
 create mode 100644 java/06-simple-objects-better/AccountApp.java
 create mode 100644 java/06-simple-objects-better/AccountManager.java

(limited to 'java')

diff --git a/java/06-simple-objects-better/.gitignore b/java/06-simple-objects-better/.gitignore
new file mode 100644
index 0000000..6b468b6
--- /dev/null
+++ b/java/06-simple-objects-better/.gitignore
@@ -0,0 +1 @@
+*.class
diff --git a/java/06-simple-objects-better/Account.java b/java/06-simple-objects-better/Account.java
new file mode 100644
index 0000000..4b26eca
--- /dev/null
+++ b/java/06-simple-objects-better/Account.java
@@ -0,0 +1,26 @@
+public class Account {
+	
+	/* Declaring fields  - represent state */
+	
+	int accountNumber;
+	double balance;
+
+	public Account(int accountNumber, double balance) {
+		this.accountNumber = accountNumber;
+		this.balance = balance;
+	}
+
+	public int getAccountNumber() {
+		return accountNumber;
+	}
+	public void setAccountNumber(int accountNumber) {
+		this.accountNumber = accountNumber;
+	}
+	public double getBalance() {
+		return balance;
+	}
+	public void setBalance(double balance) {
+		this.balance = balance;
+	}
+	
+}
diff --git a/java/06-simple-objects-better/AccountApp.java b/java/06-simple-objects-better/AccountApp.java
new file mode 100644
index 0000000..3399770
--- /dev/null
+++ b/java/06-simple-objects-better/AccountApp.java
@@ -0,0 +1,16 @@
+public class AccountApp {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		AccountManager accountManager = new AccountManager();
+
+		System.out.println(accountManager.getBalance(2));
+
+		accountManager.deposit(2, 2.0);
+
+		System.out.println(accountManager.getBalance(2));
+	}
+
+}
diff --git a/java/06-simple-objects-better/AccountManager.java b/java/06-simple-objects-better/AccountManager.java
new file mode 100644
index 0000000..5a3368c
--- /dev/null
+++ b/java/06-simple-objects-better/AccountManager.java
@@ -0,0 +1,39 @@
+import java.util.HashMap;
+import java.util.Map;
+
+public class AccountManager {
+
+    private Map<Integer, Account> accounts = new HashMap<>();
+
+	/*
+		This is a called a constructor. It gets executed when an object of this class is
+		created.	
+	*/
+    public AccountManager() {
+		// For testing, create some account objects.
+		// In a real systems, account data will be in a storage system like a database.
+
+		Account account = new Account(1, 10.0);
+        accounts.put(account.getAccountNumber(), account);
+
+		account = new Account(2, 20.0);
+        accounts.put(account.getAccountNumber(), account);
+        
+		account = new Account(3, 10.0);
+        accounts.put(account.getAccountNumber(), account);
+    }
+
+	public void withdraw(int accountId, double amount) {
+		Account account = accounts.get(accountId);
+		account.setBalance(account.getBalance() - amount);
+	}
+
+	public void deposit(int accountId, double amount) {
+		Account account = accounts.get(accountId);
+		account.setBalance(account.getBalance() + amount);
+	}
+
+	public double getBalance(int accountId) {
+		return accounts.get(accountId).getBalance();
+	}
+}
-- 
cgit v1.2.3