Operator '!=' cannot be applied to 'int', 'null' 运算符“!=”不能应用于“int”,“null” lqw.eq(bo.getClassId() !=null, StudentClass::getClassId, bo.getClassId()); 把实体类中int型数据改成Long型 privateLong classId;
针对你提出的问题“operator '==' cannot be applied to 'int', 'org.apache.poi.ss.usermodel.celltype'”,以下是我的详细回答: 1. 分析错误消息 错误消息表明,在尝试使用==操作符比较两个不同类型的值时发生了问题。具体来说,左侧是整型(int),而右侧是org.apache.poi.ss.usermodel.CellType枚举类型。在...
在运行以下代码时,系统报错 Operator '&' cannot be applied to 'int', 'boolean' 原因:J在ava语法中关系运算符的优先级大于逻辑运算符,所以先算(a-1) != 0得到一个boolean类型的值。&左右是布尔类型时会转换成逻辑运算符进行逻辑运算,否则会进行位运算。int & boolean操作符两边类型不一致显然不行,无法判定...
if(quicklink.getId() ==null) 修改好 Integer id = quicklink.getId();if(id==null || id == 0){} 就好了
代码贴上来看看 year%400 得到 是整形，你用！表示非，是true 与 false的，当然 不行了year%400 ！= 0 什么 的才是对的 具体
1. 2. 3. 4. 5. 6. 7. 8. 9. 程序报错:Operator ‘<=’ cannot be applied to ‘boolean’,‘int’ 原因是Java中 if 语句不支持这样的表达方式。正确的表达方式应该为 if( 3<= i && i <= 5 ){ System.out.println("春天"); }else if( 6 <= i && i <= 8 ){ ...
Cannot convert from 'Object to Int' Cannot convert int[] to object[] Cannot convert lambda expression to type 'System.Threading.Tasks.Task' Cannot convert null to 'int' because it is a value type--need help Cannot convert string[] to string in foreach loop Cannot convert type 'System.Col...
be applied to 'boolean'，'int'“错误，我不确定原因ENERROR in Cannot use 'in' operator to ...
Thanks. I also associate += with numerical values, but in the video Pasan uses += to add Thanks. I also associate += with numerical values, but in the video Pasan uses it to add one array to another, but at least in the latest version of xCode it is saying that it can't be do...
当在写代码时,遇到不符合规范Operator '==' cannot be applied to 'long', 'null' 例如: 这个问题是因为groupId是基本类型long,不是包装类型Long,所以不能为空,把long 改为Lon