3 files changed, 19 insertions, 6 deletions

diff --git a/src/ch/epfl/xblast/Lists.java b/src/ch/epfl/xblast/Lists.java
index 3794c1e..526ebf4 100644
--- a/src/ch/epfl/xblast/Lists.java
+++ b/src/ch/epfl/xblast/Lists.java
@@ -130,12 +130,24 @@ public final class Lists {
      * @param lists the lists to concatenate
      * @param <T>   the type of the list's elements
      * @return the list result of the concatenation
+     * @deprecated Use List<T> concatenated(List<List<T>> lists) instead to avoid parametrized varargs.
      */
     public static <T> List<T> concatenated(List<T>... lists) {
+        return concatenated(Arrays.asList(lists));
+    }
+
+    /**
+     * Returns an immutable copy of the given lists, concatenated.
+     *
+     * @param lists the lists to concatenate
+     * @param <T>   the type of the list's elements
+     * @return the list result of the concatenation
+     */
+    public static <T> List<T> concatenated(List<List<T>> lists) {
         return Collections.unmodifiableList(
-                Stream.of(lists)
+                lists.stream()
                         .map(List::stream)
-                        .reduce(Stream::concat).orElse(Stream.empty())
+                        .reduce(Stream::concat).orElseGet(Stream::empty)
                         .collect(Collectors.toList()));
     }
 
diff --git a/src/ch/epfl/xblast/client/painter/TimeLinePainter.java b/src/ch/epfl/xblast/client/painter/TimeLinePainter.java
index 7912d88..c8b0bd5 100644
--- a/src/ch/epfl/xblast/client/painter/TimeLinePainter.java
+++ b/src/ch/epfl/xblast/client/painter/TimeLinePainter.java
@@ -5,6 +5,7 @@ import ch.epfl.xblast.client.ImageCollection;
 import ch.epfl.xblast.server.Ticks;
 
 import java.awt.*;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
@@ -31,9 +32,9 @@ public class TimeLinePainter {
      * @return the list of images composing the time "line"
      */
     public static List<Image> buildTimeLine(int t) {
-        return Lists.concatenated(
+        return Lists.concatenated(Arrays.asList(
                 Collections.nCopies(t, LED_ON_IMG),
-                Collections.nCopies(TIME_LINE_SIZE - t, LED_OFF_IMG));
+                Collections.nCopies(TIME_LINE_SIZE - t, LED_OFF_IMG)));
     }
 
 }
diff --git a/src/ch/epfl/xblast/server/GameStateSerializer.java b/src/ch/epfl/xblast/server/GameStateSerializer.java
index df448a5..b7d7758 100644
--- a/src/ch/epfl/xblast/server/GameStateSerializer.java
+++ b/src/ch/epfl/xblast/server/GameStateSerializer.java
@@ -143,11 +143,11 @@ public final class GameStateSerializer {
      * @return the serialized GameState
      */
     public static List<Byte> serialize(BoardPainter bp, GameState gs) {
-        return Lists.concatenated(
+        return Lists.concatenated(Arrays.asList(
                 compress(serializeBoard(bp, gs.board())),
                 compress(serializeExplosions(gs.bombedCells(), gs.blastedCells(), gs.board())),
                 serializePlayers(gs.players(), gs.ticks()),
-                serializeRemainingTime(gs.remainingTime()));
+                serializeRemainingTime(gs.remainingTime())));
     }
 
 }