Some reformatting.

src/StockExchange/Exchange.java

@@ -9,6 +9,7 @@ public class Exchange extends Thread {
 
     // Class to describe an executed order
     public class Quote {
+
         double bid;
         double bid_size;
         double ask;
@@ -19,35 +20,29 @@ public class Exchange extends Thread {
         public long time;
     }
 
-	
-	
-
     // QuoteReceiver has to be implemented by objects that wants 
     // to receive quote updates  	
-	public interface QuoteReceiver
-	{
+    public interface QuoteReceiver {
+
         void UpdateQuote(Quote q);
     }
 
     // Here we store the list of quote receivers
     TreeSet<QuoteReceiver> qrlist = new TreeSet<QuoteReceiver>();
-	public void AddQuoteReceiver(QuoteReceiver qr)
-	{
+
+    public void AddQuoteReceiver(QuoteReceiver qr) {
         qrlist.add(qr);
     }
 
     // send updated quotes to all quote receivers
-	void UpdateQuoteReceivers(Quote q)
-	{
+    void UpdateQuoteReceivers(Quote q) {
         Iterator<QuoteReceiver> i = qrlist.iterator();
         while (i.hasNext()) {
             i.next().UpdateQuote(q);
         }
     }
 
-
-
-	public ArrayList<Quote> quoteHistory = new ArrayList<Quote>();
+    public ArrayList<Quote> quoteHistory = new ArrayList();
 
     // long time = 0;
     double price = 12.9;
@@ -57,7 +52,6 @@ public class Exchange extends Thread {
     long lastsize;
 
     // Order orderlist[];
-
     TreeSet<BuyOrder> bid = new TreeSet<BuyOrder>();
     TreeSet<SellOrder> ask = new TreeSet<SellOrder>();
 
@@ -76,34 +70,28 @@ public class Exchange extends Thread {
         available.release();
     }
 
-	
-	
-
     public void print_current() {
 
-	
         BuyOrder b;
         SellOrder a;
 
-		
         //String bid;
-		
-
         if (bid.isEmpty()) {
             b = new BuyOrder();
             b.limit = -1;
             b.size = 0;
-		} else
+        } else {
             b = bid.first();
+        }
 
         if (ask.isEmpty()) {
             a = new SellOrder();
             a.limit = -1;
             a.size = 0;
 
-		} else
+        } else {
             a = ask.first();
-		
+        }
 
         Logger.info(
                 String.format("BID: %s(%s)  LAST: %.2f(%d)  ASK: %s(%s)\n",
@@ -164,18 +152,11 @@ public class Exchange extends Thread {
             if (b.limit >= a.limit) {
                 double price;
 
-				
-
-				
-						
-				
-				
-				if (b.id < a.id)
+                if (b.id < a.id) {
                     price = b.limit;
-				else
+                } else {
                     price = a.limit;
-
-
+                }
 
                 long size = 0;
 
@@ -201,7 +182,6 @@ public class Exchange extends Thread {
                 this.UpdateQuoteReceivers(q);
 
                 //quoteHistory.add(q);
-
                 continue;
 
             }
@@ -251,7 +231,6 @@ public class Exchange extends Thread {
 	 * 
 	 * }
      */
-
     public double getlastprice() {
         /*
 		 * SellOrder so = new SellOrder(); so.limit=1000.0; so.size=500;

src/StockExchange/Logger.java

@@ -6,15 +6,17 @@ public class Logger {
     static boolean info = true;
 
     static void dbg(String s) {
-		if (!dbg)
+        if (!dbg) {
             return;
+        }
         System.out.print("DBG: ");
         System.out.println(s);
     }
 
     static void info(String s) {
-		if (!info)
+        if (!info) {
             return;
+        }
         System.out.print("INFO: ");
         System.out.println(s);
     }

src/StockExchange/SellOrder.java

@@ -2,6 +2,7 @@ package StockExchange;
 
 public class SellOrder extends Order {
 
+        @Override
 	public int compareTo(Order o) {
 	
 		if (o.limit < limit) {