Add input validation and error handling for withdrawal and transfer balance

.classpath

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="src" path="atm/src"/>
+	<classpathentry kind="output" path="atm/build/classes"/>
+</classpath>

.project

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>ATM-Management-System-Maintenance-Project</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>1768836522542</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>

README.md

@@ -4,9 +4,9 @@ This repository contains an ATM Management System project implemented in Java.
 
 ## Instructions
 
-To run the program, follow these steps:
+To run the program, follow these steps: --
 
-1. Run the `AtmMainDriver` file.
+1. Run the `AtmMainDriver` file. 
 2. No additional packages need to be downloaded.
 3. The username and password for both "Admin" and "User" are as follows:
    - Username: zahid

atm/src/atm/Admin.java

@@ -2,9 +2,9 @@
 import java.awt.Color;
 import java.awt.Container;
 import java.awt.event.*;
+import java.io.*;
 import java.util.*;
 import javax.swing.*;
-import java.io.*;
 
 /*\ I have to add these options
     Add Account
@@ -23,7 +23,7 @@ public class Admin extends JFrame implements ActionListener
     JLabel atmLab;
     Container con;
     ArrayList customerlist;
-    String s1,s2,s3;
+    String s1;
     Admin()
     {
         super("ADMIN");
@@ -67,7 +67,42 @@ public class Admin extends JFrame implements ActionListener
     saveToFile.addActionListener(this);
     logOut.addActionListener(this);
 
+    loadPersons();
+    }
 
+    /*******************************LOAD ACCOUNT FROM FILE*******************************************/
+    public void loadPersons()
+    {
+        String ss[]=null;
+        String pincode,customername,accounttype,accountnumber,startbalance;
+
+        try
+        {
+            FileReader fr=new FileReader("Customer Record.txt");
+            BufferedReader br=new BufferedReader(fr);
+
+            String line=br.readLine();  
+
+            while(line != null)
+            {
+                ss=line.split(",");
+                pincode=ss[0];
+                customername=ss[1];
+                accounttype=ss[2];
+                accountnumber=ss[3];
+                startbalance=ss[4];
+
+                AccountData atm=new AccountData(pincode,customername,accounttype,accountnumber,startbalance);
+                customerlist.add(atm);
+                line=br.readLine();
+            }
+            br.close();
+            fr.close();
+        }
+        catch(IOException ioEX)
+        {
+            System.out.println("No existing customer records found. Starting fresh.");
+        }
     }
 
     /*******************************ADD ACCOUNT************************************************/
@@ -218,6 +253,7 @@ public void edit(String n)
     /************************************************************************************************************/
 
     /***************************************************************************************************/
+    @Override
     public void actionPerformed(ActionEvent e)
     {
 

atm/src/atm/AfterLogin.java

@@ -1,19 +1,19 @@
 package atm;
 import java.awt.*;
 import java.awt.event.*;
+import java.io.*;
 import java.util.*;
 import javax.swing.*;
-import java.io.*;
 
 public class AfterLogin extends JFrame implements ActionListener
 {
 
-    JButton equiryBtn,withdrawBtn,logoutBtn,transferBtn;  
+    JButton equiryBtn,withdrawBtn,logoutBtn,transferBtn,transactionHistoryButton;  
     JLabel atmLab;
     Container con;
     ArrayList customerlist;
-    Admin adm = new Admin();
     String s1;
+    String pincode;
 
     AfterLogin()
     {
@@ -38,20 +38,25 @@ public class AfterLogin extends JFrame implements ActionListener
         withdrawBtn = new JButton("WithDraw Money");
         withdrawBtn.setBounds(260,230,150,40);
 
-
+        transactionHistoryButton = new JButton("Transaction History");
+        transactionHistoryButton.setBounds(200,300,180,30);
+        transactionHistoryButton.setFont(new Font("Arial", Font.BOLD, 14));
+
         logoutBtn = new JButton("Logout");
         logoutBtn.setBounds(10,230,150,40);
 
        con.add(atmLab);
        con.add(equiryBtn);
        con.add(withdrawBtn);
        con.add(transferBtn);
+       con.add(transactionHistoryButton);
        con.add(logoutBtn);
     /********************************************************************/
 
     equiryBtn.addActionListener(this);
     transferBtn.addActionListener(this);
     withdrawBtn.addActionListener(this);
+    transactionHistoryButton.addActionListener(this);
     logoutBtn.addActionListener(this);
 
     loadPersons();
@@ -95,19 +100,79 @@ public void loadPersons()
 
 /***************************************************************************************************************************/
 
+/********************************************************* Transaction Logging Method *************************************/
+private void logTransaction(String type, double amount, double newBalance) {
+    String filename = "transactions_" + this.pincode + ".txt";
+    try {
+        FileWriter fw = new FileWriter(filename, true);
+        BufferedWriter bw = new BufferedWriter(fw);
+
+        // Get current timestamp
+        java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+        String timestamp = sdf.format(new java.util.Date());
+
+        // Write transaction details
+        bw.write(type + " | " + amount + " | " + newBalance + " | " + timestamp);
+        bw.newLine();
+        bw.close();
+        fw.close();
+    } catch(IOException ioEX) {
+        System.out.println(ioEX);
+    }
+}
+
+/***************************************************************************************************************************/
+
+/********************************************************* View Transaction History *************************************/
+public void viewTransactionHistory(String pincode) {
+    String filename = "transactions_" + pincode + ".txt";
+    try {
+        FileReader fr = new FileReader(filename);
+        BufferedReader br = new BufferedReader(fr);
+
+        ArrayList<String> transactions = new ArrayList<>();
+        String line = br.readLine();
+
+        while(line != null) {
+            transactions.add(line);
+            line = br.readLine();
+        }
+        br.close();
+        fr.close();
+
+        // Display last 10 transactions
+        StringBuilder history = new StringBuilder();
+        int start = Math.max(0, transactions.size() - 10);
+
+        if(transactions.isEmpty()) {
+            history.append("No transactions found.");
+        } else {
+            history.append("Last ").append(Math.min(10, transactions.size())).append(" Transactions:\n\n");
+            for(int i = start; i < transactions.size(); i++) {
+                history.append(transactions.get(i)).append("\n");
+            }
+        }
+
+        JOptionPane.showMessageDialog(null, history.toString(), "Transaction History", JOptionPane.INFORMATION_MESSAGE);
+    } catch(IOException ioEX) {
+        JOptionPane.showMessageDialog(null, "No transaction history found for this account.", "Transaction History", JOptionPane.INFORMATION_MESSAGE);
+    }
+}
+
+/***************************************************************************************************************************/
+
+
+/********************************************************* Balance Enquiry of Customer ************************************/
+    private void inquiry(String k) {
+        for(int i=0;i<customerlist.size();i++) {
+            AccountData atm=(AccountData)customerlist.get(i);
+            if(k.equals(atm.pincode)) {
+                this.pincode = k;
+                JOptionPane.showMessageDialog(null,"Welcome to your atm data Mr  ."+atm.customername+"\nYour Total Cash Is : "+atm.startbalance,"WELCOME WELCOME MR  "+atm.customername,JOptionPane.INFORMATION_MESSAGE);
+            }
+        }
+    }        
 
-/********************************************************* Balance Enquiry of Customer ************************************/        
-	public void inquiry(String n)
-	{
-		for(int i=0;i<customerlist.size();i++)
-		{
-			AccountData atm=(AccountData)customerlist.get(i);
-			if(n.equals(atm.pincode))
-			{
-				JOptionPane.showMessageDialog(null,"Welcome to your atm data Mr  ."+atm.customername+"\nYour Total Cash Is : "+atm.startbalance,"WELCOME WELCOME MR  "+atm.customername,JOptionPane.INFORMATION_MESSAGE);
-			}
-		}
-	}
 /***************************************************************************************************************************/
 
 
@@ -127,10 +192,17 @@ public void transfer(String k)
 				d=Integer.parseInt(a);
 
 				c=JOptionPane.showInputDialog(null,"Enter The Account Number To whom you Transfer Amount","MONEY TRANSACTION MENU",JOptionPane.QUESTION_MESSAGE);
-				b=JOptionPane.showInputDialog(null,"Enter The Amount To Transfer","MONEYTRANSACTION MENU",JOptionPane.QUESTION_MESSAGE);
-				e=Integer.parseInt(b);
-
-				f=d-e;
+				//CR02- validation & error handling for balance transfer 
+        		try {
+            		b = JOptionPane.showInputDialog(null,"Enter The Amount To Transfer", "MONEY TRANSACTION MENU",JOptionPane.QUESTION_MESSAGE);
+          			e = Integer.parseInt(b);
+          			if (e <= 0) {
+            			throw new NumberFormatException();
+          			}
+        				} catch (NumberFormatException ex) {JOptionPane.showMessageDialog(null,"Invalid input. Please enter a valid numeric amount.","Input Error",JOptionPane.ERROR_MESSAGE);
+         				return;
+        			}
+        		f = d - e;
 				while(f < 0)
 				{
 					a=atm.startbalance;
@@ -143,6 +215,8 @@ public void transfer(String k)
 				String u=String.valueOf(f);
 				atm.startbalance=u;
 
+			logTransaction("Transfer", (double)e, (double)f);
+
 				JOptionPane.showMessageDialog(null,"Transaction is done succesfully\n\nAmount of "+b+"is transferd To "+c+"\n\nYour Total Cash Is : "+atm.startbalance,"MONEY TRANSACTION PROCESSED",JOptionPane.INFORMATION_MESSAGE);
 
                                 Admin as = new Admin();
@@ -168,10 +242,17 @@ public void withdraw(String o)
 				a=atm.startbalance;
 				d=Integer.parseInt(a);
 
-				b=JOptionPane.showInputDialog(null,"Enter The Amout To Withdarw","WITHDARW MENU",JOptionPane.QUESTION_MESSAGE);
-				e=Integer.parseInt(b);
-
-				f=d-e;
+				//CR02-validation & error handling for withdraw  balance
+    			try {
+          		b = JOptionPane.showInputDialog(null,"Enter The Amount To Withdraw","WITHDRAW MENU",JOptionPane.QUESTION_MESSAGE);
+          		e = Integer.parseInt(b);
+          		if (e <= 0) {
+            		throw new NumberFormatException();
+          		}
+        			} catch (NumberFormatException ex) {JOptionPane.showMessageDialog(null,"Invalid input. Please enter a valid numeric amount.","Input Error",JOptionPane.ERROR_MESSAGE);
+        			return;
+     			}
+      			f = d - e;
 
 				while(f <0)
 				{
@@ -184,8 +265,9 @@ public void withdraw(String o)
 					f=d-e;
 				}
 				c=String.valueOf(f);
-				atm.startbalance=c;
-				JOptionPane.showMessageDialog(null,"Withdarw proccesed\nYou have Withdarwed Amount of"+b+"\nYour Total Cash Is now: "+atm.startbalance,"Information",JOptionPane.INFORMATION_MESSAGE);
+				atm.startbalance=c;			
+			logTransaction("Withdraw", (double)e, (double)f);
+							JOptionPane.showMessageDialog(null,"Withdarw proccesed\nYou have Withdarwed Amount of"+b+"\nYour Total Cash Is now: "+atm.startbalance,"Information",JOptionPane.INFORMATION_MESSAGE);
 				Admin ad = new Admin();
                                 ad.savePerson();
 			}
@@ -204,6 +286,7 @@ public void actionPerformed(ActionEvent e)
 	if(b == equiryBtn)
         {		
             s1= JOptionPane.showInputDialog(null,"Enter PinCode To Check Account Balance ","Check Balance",JOptionPane.QUESTION_MESSAGE);
+            this.pincode = s1;
 
 
             		for(int i=0;i<customerlist.size();i++)
@@ -227,6 +310,7 @@ else if(s1.equals(atm.pincode))
         if(b == withdrawBtn)
         {
           s1=JOptionPane.showInputDialog(null,"Enter PinCode To withDraw Balance ","Withdraw Balance",JOptionPane.QUESTION_MESSAGE);
+          this.pincode = s1;
            for(int i=0;i<customerlist.size();i++)
 		{
 			AccountData atm=(AccountData)customerlist.get(i);
@@ -240,7 +324,7 @@ else if(s1.equals(atm.pincode))
                          else if(!s1.equals(atm.pincode))
 			{
 				JOptionPane.showMessageDialog(null,"You have entered Wrong Pincode \nPlease Enter Valid Pincode!!!!","Warning",JOptionPane.WARNING_MESSAGE);
-					
+
 			}
                 }
         }
@@ -249,6 +333,7 @@ else if(!s1.equals(atm.pincode))
         if(b == transferBtn)
         {
              s1=JOptionPane.showInputDialog(null,"Enter PinCode To Transfer Balance ","Share balance",JOptionPane.QUESTION_MESSAGE);
+             this.pincode = s1;
 
              for(int i=0;i<customerlist.size();i++)
 		{
@@ -267,6 +352,27 @@ else if(s1.equals(atm.pincode))
                 }        
         }
 
+/******************************************************************************************************************************/
+
+        if(b == transactionHistoryButton)
+        {
+            s1= JOptionPane.showInputDialog(null,"Enter PinCode To View Transaction History ","Transaction History",JOptionPane.QUESTION_MESSAGE);
+
+            for(int i=0;i<customerlist.size();i++)
+            {
+                AccountData atm=(AccountData)customerlist.get(i);
+
+                if(s1.equals(atm.pincode))
+                {
+                    viewTransactionHistory(s1);
+                }
+                else if(!s1.equals(atm.pincode))
+                {
+                    JOptionPane.showMessageDialog(null,"You have entered Wrong Pincode \nPlease Enter Valid Pincode!!!!","Warning",JOptionPane.WARNING_MESSAGE);
+                }
+            }
+        }
+
 /******************************************************************************************************************************/
 
             if(b == logoutBtn)

atm/src/atm/AtmMainDriver.java

@@ -1,7 +1,4 @@
 package atm;
-import java.awt.Color;
-import java.awt.event.*;
-import java.util.*;
 import javax.swing.*;
 
 public class AtmMainDriver 
@@ -17,3 +14,4 @@ public static void main(String[] args)
     }
 
 }
+