添加

src/main/java/com/unissoft/MyConstant.java

@@ -29,6 +29,7 @@ public class MyConstant {
     public static final int THREE = 3;
     public static final int FOUR = 4;
     public static final String ONE_STR = "1";
+    public static final String THREE_STR = "3";
 
     public static final String TEN = "10";
     public static final String TWENTY = "20";