update 227

Author: fishercoder1534

Diff for: src/main/java/com/fishercoder/solutions/_227.java

@@ -29,6 +29,7 @@ public int calculate(String s) {
                         stack.addLast(stack.pollLast() * num);
                     }
                     sign = s.charAt(i);
+                    //reset num for the next integer
                     num = 0;
                 }
             }

Diff for: src/test/java/com/fishercoder/_227Test.java

@@ -1,16 +1,16 @@
 package com.fishercoder;
 
 import com.fishercoder.solutions._227;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _227Test {
     private static _227.Solution1 solution1;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _227.Solution1();
     }