Added a sample project that shows how to create and use jar files.

1 files changed, 39 insertions, 0 deletions

diff --git a/java/07-simple-objects-better-use-jar/myaccountslib/src/AccountManager.java b/java/07-simple-objects-better-use-jar/myaccountslib/src/AccountManager.java
new file mode 100644
index 0000000..5a3368c
--- /dev/null
+++ b/java/07-simple-objects-better-use-jar/myaccountslib/src/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();
+	}
+}