Assignment 1

.classpath

@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-16">
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
 		<attributes>
 			<attribute name="module" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="lib" path="/Users/Rohan/Documents/GitHub/ATM-Project/src"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

src/ATM.java

@@ -1,25 +1,48 @@
-import java.util.*;
+mport java.util.HashMap;
 
 public class ATM {
-	HashMap<String, Integer> map;
-
-	public ATM() {
-		map = new HashMap<String, Integer>();
+	private HashMap <String, Double> database;
+
+	public  ATM()
+	{
+		database = new HashMap <String, Double> ();
 	}
-
-	public void deposit(String id, int amt) {
-		map.put(id, amt);
+
+	public void deposit(String userID, double amount) throws Exception
+	{
+		if (database.containsKey (userID))
+		{
+			double currBalance= database.get(userID);
+			database.replace(userID, currBalance + amount);
+		}
+		else
+		{
+			database.put(userID,amount);
+
+		}
 	}
-
-
-	@Override
-	public String toString() {
-		return "ATM [map=" + map + "]";
+
+	public void withdraw (String userID, double amount) throws Exception
+	{
+		double currBalance = database.get(userID);
+		if (amount> currBalance)
+		{
+			throw new Exception();
+		}
+		else
+		{
+			database.replace(userID, currBalance - amount);
+
+		}
 	}
 
-	public static void main (String [] args) {
-		ATM chase = new ATM();
-		chase.deposit("COLINYUAN01", 1000000);
-		System.out.println(chase.toString());
+	public double checkBalance (String userID) throws Exception
+	{
+		if (!database.containsKey (userID))
+		{
+			throw new Exception();
+
+		}
+		return database.get(userID);
 	}
 }

src/ATMTester.java

@@ -0,0 +1,17 @@
+
+public class ATMTester {
+	public static void main (String[] args) {
+		ATM chase = new ATM();
+		chase.deposit("Winfrey", 10.0);
+		chase.deposit("Bezos", 5.0);
+		chase.deposit("Bezos", 2.0);
+		chase.deposit("MrTheiss",13.0);
+		chase.withdraw("Bezos", 2.0);
+		chase.withdraw("MrTheiss", 15.0);
+		System.out.println(chase.checkBalance("Bezos"));
+		System.out.println(chase.checkBalance("Winfrey"));
+		System.out.println(chase.checkBalance("YoMama"));
+		System.out.println(chase.checkBalance("MrTheiss"));
+
+	}
+}