diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/Lang.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/Lang.java
index 0dd671af8..3beebeeec 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/Lang.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/Lang.java
@@ -216,8 +216,8 @@ public final class Lang {
         return convert(map.get(key), clazz, defaultValue);
     }
 
-    public static <T> List<T> merge(Collection<T> a, Collection<T> b) {
-        LinkedList<T> result = new LinkedList<>();
+    public static <T> List<T> merge(Collection<? extends T> a, Collection<? extends T> b) {
+        List<T> result = new ArrayList<>();
         if (a != null)
             result.addAll(a);
         if (b != null)
@@ -225,17 +225,6 @@ public final class Lang {
         return result;
     }
 
-    public static <T> List<T> merge(Collection<T> a, Collection<T> b, Collection<T> c) {
-        LinkedList<T> result = new LinkedList<>();
-        if (a != null)
-            result.addAll(a);
-        if (b != null)
-            result.addAll(b);
-        if (c != null)
-            result.addAll(c);
-        return result;
-    }
-
     public static void executeDelayed(Runnable runnable, TimeUnit timeUnit, long timeout, boolean isDaemon) {
         thread(() -> {
             try {