Variable 'X' is used before it has been assigned a value. A null reference exception could result at...
在自己做机房收费系统的过程中出现了这样的一个现象:如图 str1 下面出现了一行波浪线.同时提醒自己错出现的错误.提示如下: Variable 'str1' is used before it has been assigned a value. A null reference exception could result at runtime. 在Build的时候会出现以下的警告: 如图: 问
相关文章
- 1. What are the differences between a pointer variable and a reference variable in C++?
- 2. 2021-01-26nested exception is java.lang.IllegalArgumentException: A null value cannot be assigned to
- 3. Null value was assigned to a property of primitive
- 4. Attempted to access a cursor after it has been clo
- 5. vue 解决 error ‘xxxx‘ is assigned a value but never used no-unused-vars
- 6. Bitmap.getWidth() on a null object reference at webview.getDefaultVideoPoster
- 7. [BTS]The join order has been enforced because a local join hint is used.;Duplicate key was ignored."
- 8. org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type sette
- 9. efined in null, could not be registered. A bean with that name has already been defined in null and
- 10. is - a和 has - a
- 更多相关文章...
- • XML DOM value 属性 - XML DOM 教程
- • XSL-FO region-before 对象 - XSL-FO 教程
- • 为了进字节跳动，我精选了29道Java经典算法题，带详细讲解
- • Java 8 Stream 教程
相关标签/搜索
每日一句
-
每一个你不满意的现在，都有一个你没有努力的曾经。
最新文章
欢迎关注本站公众号,获取更多信息
相关文章
- 1. What are the differences between a pointer variable and a reference variable in C++?
- 2. 2021-01-26nested exception is java.lang.IllegalArgumentException: A null value cannot be assigned to
- 3. Null value was assigned to a property of primitive
- 4. Attempted to access a cursor after it has been clo
- 5. vue 解决 error ‘xxxx‘ is assigned a value but never used no-unused-vars
- 6. Bitmap.getWidth() on a null object reference at webview.getDefaultVideoPoster
- 7. [BTS]The join order has been enforced because a local join hint is used.;Duplicate key was ignored."
- 8. org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type sette
- 9. efined in null, could not be registered. A bean with that name has already been defined in null and
- 10. is - a和 has - a