diff --git a/app/src/main/java/com/hippo/yorozuya/collect/IntList.java b/app/src/main/java/com/hippo/yorozuya/collect/IntList.kt
similarity index 100%
rename from app/src/main/java/com/hippo/yorozuya/collect/IntList.java
rename to app/src/main/java/com/hippo/yorozuya/collect/IntList.kt
diff --git a/app/src/main/java/com/hippo/yorozuya/collect/LongList.java b/app/src/main/java/com/hippo/yorozuya/collect/LongList.kt
similarity index 100%
rename from app/src/main/java/com/hippo/yorozuya/collect/LongList.java
rename to app/src/main/java/com/hippo/yorozuya/collect/LongList.kt