finished exercises pertaining

TicketMachine.java

@@ -24,12 +24,16 @@ public class TicketMachine
      * Note that the price must be greater than zero, and there
      * are no checks to ensure this.
      */
-    public TicketMachine(int ticketCost)
-    {
-        int price = ticketCost;
+    public TicketMachine(int ticketCost) {
+        price = ticketCost;
         balance = 0;
         total = 0;
     }
+    
+    public TicketMachine()
+    {
+        this(1000);
+    }
 
     /**
      * Return the price of a ticket.
@@ -52,6 +56,15 @@ public class TicketMachine
     {
         return total;
     }
+    
+    public void setPrice(int ticketCost) 
+    {
+        price = ticketCost;
+    }
+    
+    public void discount(int amount) {
+        price -= amount;
+    }
 
     /**
      * Receive an amount of money in cents from a customer.
@@ -81,4 +94,16 @@ public class TicketMachine
         // Clear the balance.
         balance = 0;
     }
+    
+    public void prompt() {
+        System.out.println("Please insert the correct amount of money.");
+    }
+    
+    public void showPrice() {
+        System.out.println("The price of a ticket is " + this.price + " cents.");
+    }
+    
+    public void empty() {
+        total = 0;
+    }
 }