diff --git a/Mage.Client/src/main/java/mage/client/deck/generator/DeckGeneratorPool.java b/Mage.Client/src/main/java/mage/client/deck/generator/DeckGeneratorPool.java
index cf77d9d09e..d8dd0e06c2 100644
--- a/Mage.Client/src/main/java/mage/client/deck/generator/DeckGeneratorPool.java
+++ b/Mage.Client/src/main/java/mage/client/deck/generator/DeckGeneratorPool.java
@@ -311,8 +311,7 @@ public class DeckGeneratorPool
      */
     public Deck getDeck() {
         Set<Card> actualDeck = deck.getCards();
-        for(Card card : deckCards)
-            actualDeck.add(card);
+        actualDeck.addAll(deckCards);
         return deck;
     }
 
diff --git a/Mage.Client/src/main/java/mage/client/deckeditor/CardSelector.java b/Mage.Client/src/main/java/mage/client/deckeditor/CardSelector.java
index bb5b35ef29..58c358e86e 100644
--- a/Mage.Client/src/main/java/mage/client/deckeditor/CardSelector.java
+++ b/Mage.Client/src/main/java/mage/client/deckeditor/CardSelector.java
@@ -205,9 +205,7 @@ public class CardSelector extends javax.swing.JPanel implements ComponentListene
         this.btnExpansionSearch.setVisible(false);
         this.limited = true;
         this.cards.clear();
-        for (Card card : sideboard) {
-            this.cards.add(card);
-        }
+        this.cards.addAll(sideboard);
         filterCards();
     }
 
diff --git a/Mage.Client/src/main/java/mage/client/table/TournamentMatchesTableModel.java b/Mage.Client/src/main/java/mage/client/table/TournamentMatchesTableModel.java
index 288a5c70f7..9a39c69207 100644
--- a/Mage.Client/src/main/java/mage/client/table/TournamentMatchesTableModel.java
+++ b/Mage.Client/src/main/java/mage/client/table/TournamentMatchesTableModel.java
@@ -22,9 +22,7 @@ public class TournamentMatchesTableModel extends AbstractTableModel {
         List<TournamentGameView> views = new ArrayList<>();
         watchingAllowed = tournament.isWatchingAllowed();
         for (RoundView round : tournament.getRounds()) {
-            for (TournamentGameView game : round.getGames()) {
-                views.add(game);
-            }
+            views.addAll(round.getGames());
         }
         games = views.toArray(new TournamentGameView[0]);
         this.fireTableDataChanged();
diff --git a/Mage.Client/src/main/java/org/mage/plugins/card/dl/sources/CopyPasteImageSource.java b/Mage.Client/src/main/java/org/mage/plugins/card/dl/sources/CopyPasteImageSource.java
index 0011134ab3..8f76b84992 100644
--- a/Mage.Client/src/main/java/org/mage/plugins/card/dl/sources/CopyPasteImageSource.java
+++ b/Mage.Client/src/main/java/org/mage/plugins/card/dl/sources/CopyPasteImageSource.java
@@ -232,12 +232,11 @@ public enum CopyPasteImageSource implements CardImageSource {
     @Override
     public List<String> getSupportedSets() {
         setupLinks();
-        List<String> supportedSetsCopy = new ArrayList<>();
         if (supportedSets.isEmpty()) {
             supportedSets.addAll(Sets.getInstance().keySet());
         }
 
-        supportedSetsCopy.addAll(supportedSets);
+        List<String> supportedSetsCopy = new ArrayList<>(supportedSets);
         return supportedSetsCopy;
     }
 
diff --git a/Mage.Server/src/main/java/mage/server/util/ServerMessagesUtil.java b/Mage.Server/src/main/java/mage/server/util/ServerMessagesUtil.java
index 791beceaef..61a59dccf9 100644
--- a/Mage.Server/src/main/java/mage/server/util/ServerMessagesUtil.java
+++ b/Mage.Server/src/main/java/mage/server/util/ServerMessagesUtil.java
@@ -58,8 +58,7 @@ public enum ServerMessagesUtil {
     private void reloadMessages() {
         LOGGER.debug("Reading server messages...");
         List<String> motdMessages = readFromFile();
-        List<String> newMessages = new ArrayList<>();
-        newMessages.addAll(motdMessages);
+        List<String> newMessages = new ArrayList<>(motdMessages);
         newMessages.add(getServerStatistics());
         newMessages.add(getServerStatistics2());