diff --git a/src/main/java/com/github/hcsp/Main.java b/src/main/java/com/github/hcsp/Main.java
index 9b33bac..7211a3d 100644
--- a/src/main/java/com/github/hcsp/Main.java
+++ b/src/main/java/com/github/hcsp/Main.java
@@ -12,12 +12,13 @@ public static void main(String[] args) {
     // 修复编译错误
     // 在a<b时返回字符串"a<b"，在a>b时返回字符串"a>b"，否则返回"a=b"
     public static String relation(int a, int b) {
+        String sign;
         if (a > b) {
-            String sign = ">";
+            sign = ">";
         } else if (a < b) {
-            String sign = "<";
+            sign = "<";
         } else {
-            String sign = "=";
+            sign = "=";
         }
 
         return "" + a + sign + b;
diff --git a/src/test/java/com/github/hcsp/MainTest.java b/src/test/java/com/github/hcsp/MainTest.java
index 75fa46d..c6ec35a 100644
--- a/src/test/java/com/github/hcsp/MainTest.java
+++ b/src/test/java/com/github/hcsp/MainTest.java
@@ -10,6 +10,7 @@
 import java.util.concurrent.Future;
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
+
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
@@ -38,7 +39,7 @@ public void concurrentInvocationSafetyTest() throws ExecutionException, Interrup
                                                     try {
                                                         cb.await();
                                                     } catch (InterruptedException
-                                                            | BrokenBarrierException e) {
+                                                             | BrokenBarrierException e) {
                                                         e.printStackTrace();
                                                     }
                                                     String relation = Main.relation(a, b);