diff --git a/week23.java b/week23.java
new file mode 100644
index 0000000..c1f4374
--- /dev/null
+++ b/week23.java
@@ -0,0 +1,127 @@
+import java.util.Scanner;
+
+class Person {
+    private int age;
+    private String name;
+
+    public int getAge() {
+        return age;
+    }
+    public void setAge(int age) {
+        this.age = age;
+    }
+    public String getName() {
+        return name;
+    }
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String toString() {
+        return this.getName();
+    }
+
+}
+
+class DemoPerson {
+    public static void main(String[] args) {
+
+        System.out.println(String.format("Would you like to meet a person?"));
+        Person simon = new Person();
+        simon.setAge(38);
+        simon.setName("Simon");
+        System.out.println(String.format("Their name is %s and their age is %d",
+                                         simon.getName(), simon.getAge()));
+
+        String newName = getUserInput("What shall we change their name to?");
+        simon.setName(newName);
+
+
+        System.out.println(String.format("Their name is now %s, but their age remains %d",
+                                         simon, simon.getAge())); // uses toString()
+    }
+
+    /** A simple wrapper to get some user input easily
+     * @param prompt What to prompt user for
+     * @return User's input
+     */
+    public static String getUserInput(String prompt) {
+        Scanner userInput = new Scanner(System.in);
+        System.out.println(String.format("%s", prompt));
+
+        if (userInput.hasNextLine()) {
+            return userInput.nextLine();
+        } else {
+            return "";
+        }
+    }
+}
+
+class BankAccount {
+    private String name;
+    private int accountNumber;
+    private double balance;
+
+    private static int nextAccountNumber = 0;
+
+    public BankAccount(String name) {
+        this.name = name;
+        this.balance = 0.0;
+        this.accountNumber = nextAccountNumber;
+        nextAccountNumber++;
+    }
+
+    @Override
+    public String toString() {
+        return "BankAccount [name=" + name + ", accountNumber=" + accountNumber + ", balance=" + balance + "]";
+    }
+
+    public int getAccountNumber() {
+        return accountNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public void deposit (double amount) {
+        this.balance += amount;
+    }
+
+    public void withdraw(double amount) {
+        // No overdraft facilities here!
+        if (amount <= balance) {
+            this.balance -= amount;
+        }
+    }
+}
+
+/**
+ * Exercise 2.4 & 2.6 - create two bank account objects and print their account
+ * numbers, which should be 0 and 1.
+ *
+ * I forget the name for the implementation detail but a static member is shared across class objects / instances?
+ */
+class DemoBankAccount {
+    public static void main(String[] args) {
+        BankAccount account1 = new BankAccount("Jerry");
+        BankAccount account2 = new BankAccount("Margo");
+
+        System.out.println(String.format("%s's account number: %d", account1.getName(), account1.getAccountNumber()));
+        System.out.println(String.format("%s's account number: %d", account2.getName(), account2.getAccountNumber()));
+
+        System.out.println(String.format("Jerry will deposit £10, Margo will deposit £25"));
+        account1.deposit(10.00);
+        account2.deposit(25.00);
+        System.out.println(String.format("Accounts:\n\t%s\n\t%s", account1, account2));
+
+        System.out.println(String.format("Jerry goes to the pub and needs some cash for that. Margo goes to buy new garden furniture."));
+        account1.withdraw(5.00);
+        account2.withdraw(15.00);
+        System.out.println(String.format("Accounts:\n\t%s\n\t%s", account1, account2));
+    }
+}