diff --git a/app/src/main/java/com/hippo/network/CookieDatabase.java b/app/src/main/java/com/hippo/network/CookieDatabase.kt
similarity index 100%
rename from app/src/main/java/com/hippo/network/CookieDatabase.java
rename to app/src/main/java/com/hippo/network/CookieDatabase.kt
diff --git a/app/src/main/java/com/hippo/network/CookieRepository.java b/app/src/main/java/com/hippo/network/CookieRepository.kt
similarity index 100%
rename from app/src/main/java/com/hippo/network/CookieRepository.java
rename to app/src/main/java/com/hippo/network/CookieRepository.kt
diff --git a/app/src/main/java/com/hippo/network/CookieSet.java b/app/src/main/java/com/hippo/network/CookieSet.kt
similarity index 100%
rename from app/src/main/java/com/hippo/network/CookieSet.java
rename to app/src/main/java/com/hippo/network/CookieSet.kt
diff --git a/app/src/main/java/com/hippo/network/InetValidator.java b/app/src/main/java/com/hippo/network/InetValidator.kt
similarity index 100%
rename from app/src/main/java/com/hippo/network/InetValidator.java
rename to app/src/main/java/com/hippo/network/InetValidator.kt
diff --git a/app/src/main/java/com/hippo/network/StatusCodeException.java b/app/src/main/java/com/hippo/network/StatusCodeException.kt
similarity index 100%
rename from app/src/main/java/com/hippo/network/StatusCodeException.java
rename to app/src/main/java/com/hippo/network/StatusCodeException.kt
diff --git a/app/src/main/java/com/hippo/network/UrlBuilder.java b/app/src/main/java/com/hippo/network/UrlBuilder.kt
similarity index 100%
rename from app/src/main/java/com/hippo/network/UrlBuilder.java
rename to app/src/main/java/com/hippo/network/UrlBuilder.kt