Clean up and fix bug in NetworkAcceptThread and NetworkListenThread classes.

Signed-off-by: speakeasy <mekevin1917@gmail.com>

src/main/java/net/minecraft/server/NetworkAcceptThread.java

@@ -0,0 +1,47 @@
+package net.minecraft.server;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.util.HashMap;
+
+class NetworkAcceptThread extends Thread {
+
+    final MinecraftServer a; /* synthetic field */
+
+    final NetworkListenThread b; /* synthetic field */
+
+
+    NetworkAcceptThread(NetworkListenThread networklistenthread, String s, MinecraftServer minecraftserver) {
+        b = networklistenthread;
+        a = minecraftserver;
+        // super(s);
+    }
+
+    @Override
+    public void run() {
+        HashMap<InetAddress, Long> clients = new HashMap<InetAddress, Long>();
+        do {
+            if (!b.b) {
+                break;
+            }
+            try {
+                java.net.Socket socket = NetworkListenThread.a(b).accept();
+                if (socket != null) {
+                    InetAddress addr = socket.getInetAddress();
+                    if (clients.containsKey(addr)) {
+                        if (System.currentTimeMillis() - clients.get(addr) < 5000) {
+                            clients.put(addr, System.currentTimeMillis());
+                            socket.close();
+                            continue;
+                        }
+                    }
+                    clients.put(addr, System.currentTimeMillis());
+                    NetLoginHandler netloginhandler = new NetLoginHandler(a, socket, (new StringBuilder()).append("Connection #").append(NetworkListenThread.b(b)).toString());
+                    NetworkListenThread.a(b, netloginhandler);
+                }
+            } catch (IOException ioexception) {
+                ioexception.printStackTrace();
+            }
+        } while (true);
+    }
+}