diff --git a/USB_homework/src/Computer.java b/USB_homework/src/Computer.java
deleted file mode 100644
index 299d933..0000000
--- a/USB_homework/src/Computer.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package PACKAGE_NAME;
-
-public class Computer {
-}
diff --git a/USB_homework/src/Keyboard.java b/USB_homework/src/Keyboard.java
deleted file mode 100644
index e802093..0000000
--- a/USB_homework/src/Keyboard.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package PACKAGE_NAME;
-
-public class Keyboard {
-}
diff --git a/USB_homework/src/Main.java b/USB_homework/src/Main.java
deleted file mode 100644
index 1e936b3..0000000
--- a/USB_homework/src/Main.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package PACKAGE_NAME;
-
-public class Main {
-}
diff --git a/USB_homework/src/Mouse.java b/USB_homework/src/Mouse.java
deleted file mode 100644
index 5da7c28..0000000
--- a/USB_homework/src/Mouse.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package PACKAGE_NAME;
-
-public class Mouse {
-}
diff --git a/USB_homework/src/USB.java b/USB_homework/src/USB.java
deleted file mode 100644
index 583c1fd..0000000
--- a/USB_homework/src/USB.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package PACKAGE_NAME;
-
-public interface USB {
-}
diff --git a/lianxi/src/com/test/Test.java b/lianxi/src/com/test/Test.java
deleted file mode 100644
index 2ea1072..0000000
--- a/lianxi/src/com/test/Test.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.test;
-
-public class Test {
-}