move final HashSets, ArrayList, HashMap, ... initialisation from constructor to class

src/main/java/de/bixilon/minosoft/game/datatypes/entities/Entity.java

@@ -19,15 +19,15 @@ import de.bixilon.minosoft.game.datatypes.inventory.Slot;
 import de.bixilon.minosoft.game.datatypes.objectLoader.effects.MobEffect;
 import de.bixilon.minosoft.game.datatypes.objectLoader.entities.Entities;
 
-import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.UUID;
 
 public abstract class Entity implements EntityInterface {
     final int entityId;
     final UUID uuid;
-    final HashMap<InventorySlots.EntityInventorySlots, Slot> equipment;
-    final ArrayList<StatusEffect> effectList;
+    final HashMap<InventorySlots.EntityInventorySlots, Slot> equipment = new HashMap<>();
+    final HashSet<StatusEffect> effectList = new HashSet<>();
     Location location;
     int yaw;
     int pitch;
@@ -53,8 +53,6 @@ public abstract class Entity implements EntityInterface {
         this.location = location;
         this.yaw = yaw;
         this.pitch = pitch;
-        this.equipment = new HashMap<>();
-        this.effectList = new ArrayList<>();
     }
 
     public int getEntityId() {
@@ -114,7 +112,7 @@ public abstract class Entity implements EntityInterface {
         return EntityMetaData.class;
     }
 
-    public ArrayList<StatusEffect> getEffectList() {
+    public HashSet<StatusEffect> getEffectList() {
         return effectList;
     }
 

src/main/java/de/bixilon/minosoft/game/datatypes/scoreboard/ScoreboardManager.java

@@ -16,13 +16,9 @@ package de.bixilon.minosoft.game.datatypes.scoreboard;
 import java.util.HashMap;
 
 public class ScoreboardManager {
-    final HashMap<String, Team> teams;
-    final HashMap<String, ScoreboardObjective> objectives;
+    final HashMap<String, Team> teams = new HashMap<>();
+    final HashMap<String, ScoreboardObjective> objectives = new HashMap<>();
 
-    public ScoreboardManager() {
-        teams = new HashMap<>();
-        objectives = new HashMap<>();
-    }
 
     public void addTeam(Team team) {
         teams.put(team.getName(), team);

src/main/java/de/bixilon/minosoft/game/datatypes/scoreboard/ScoreboardObjective.java

@@ -19,13 +19,12 @@ import java.util.HashMap;
 
 public class ScoreboardObjective {
     final String objectiveName;
-    final HashMap<String, ScoreboardScore> scores;
+    final HashMap<String, ScoreboardScore> scores = new HashMap<>();
     TextComponent objectiveValue;
 
     public ScoreboardObjective(String objectiveName, TextComponent objectiveValue) {
         this.objectiveName = objectiveName;
         this.objectiveValue = objectiveValue;
-        this.scores = new HashMap<>();
     }
 
     public String getObjectiveName() {

src/main/java/de/bixilon/minosoft/game/datatypes/world/World.java

@@ -26,19 +26,16 @@ import java.util.Map;
  * Collection of ChunkColumns
  */
 public class World {
-    final HashMap<ChunkLocation, Chunk> chunks;
-    final HashMap<Integer, Entity> entities;
+    final HashMap<ChunkLocation, Chunk> chunks = new HashMap<>();
+    final HashMap<Integer, Entity> entities = new HashMap<>();
     final String name;
-    final HashMap<BlockPosition, CompoundTag> blockEntityMeta;
+    final HashMap<BlockPosition, CompoundTag> blockEntityMeta = new HashMap<>();
     boolean hardcore;
     boolean raining;
     Dimension dimension; // used for sky color, etc
 
     public World(String name) {
         this.name = name;
-        chunks = new HashMap<>();
-        entities = new HashMap<>();
-        blockEntityMeta = new HashMap<>();
     }
 
     public String getName() {

src/main/java/de/bixilon/minosoft/protocol/network/Connection.java

@@ -40,10 +40,10 @@ import java.util.ArrayList;
 
 public class Connection {
     final ArrayList<ServerAddress> addresses;
-    final Network network;
-    final PacketHandler handler;
-    final PacketSender sender;
-    final ArrayList<ClientboundPacket> handlingQueue;
+    final Network network = new Network(this);
+    final PacketHandler handler = new PacketHandler(this);
+    final PacketSender sender = new PacketSender(this);
+    final ArrayList<ClientboundPacket> handlingQueue = new ArrayList<>();
     final VelocityHandler velocityHandler = new VelocityHandler(this);
     final int connectionId;
     ServerAddress address;
@@ -66,10 +66,6 @@ public class Connection {
             e.printStackTrace();
             throw new RuntimeException(e);
         }
-        network = new Network(this);
-        handlingQueue = new ArrayList<>();
-        handler = new PacketHandler(this);
-        sender = new PacketSender(this);
     }
 
     /**

src/main/java/de/bixilon/minosoft/protocol/network/Network.java

@@ -38,7 +38,7 @@ import java.util.ArrayList;
 
 public class Network {
     final Connection connection;
-    final ArrayList<ServerboundPacket> queue;
+    final ArrayList<ServerboundPacket> queue = new ArrayList<>();
     Thread socketThread;
     int compressionThreshold = -1;
     Socket socket;
@@ -49,9 +49,8 @@ public class Network {
     SecretKey secretKey;
     boolean connected;
 
-    public Network(Connection c) {
-        this.connection = c;
-        this.queue = new ArrayList<>();
+    public Network(Connection connection) {
+        this.connection = connection;
     }
 
     public void connect(ServerAddress address) {