可以使用条件语句(如if)来实现。 使用Optional类:Java 8引入了Optional类,可以更优雅地处理可能为null的对象。 示例代码(避免空指针异常) 以下是修改后的代码,展示了如何避免空指针异常: publicclassNullPointerExample{publicstaticvoidmain(String[]args){Stringstr=null;if(str!
`status` int(11) NOT NULL DEFAULT '1' COMMENT '状态 0:禁用,1:正常', `create_time` datetime NOT NULL COMMENT '创建时间', `update_time` datetime NOT NULL COMMENT '更新时间', `create_user` bigint(20) NOT NULL COMMENT '创建人', `update_user` bigint(20) NOT NULL COMMENT '修改人',...
是指在使用setDataSource方法设置数据源时,如果传入的Uri参数为空,会导致空指针异常(NullPointerException)的问题。 setDataSource是用于设置MediaPlayer或其他媒体播放器的数据源的方法。它接受不同类型的参数,包括文件路径、文件描述符、URL等。当使用Uri作为参数时,如果传入的Uri为空,就会触发空指针异常。 解决这个...
TheOperationargument was SQL_UPDATE; a data value was not a null pointer; the C data type was SQL_C_BINARY or SQL_C_CHAR; and the column length value was less than 0 but not equal to SQL_DATA_AT_EXEC, SQL_COLUMN_IGNORE, SQL_NTS, or SQL_NULL_DATA, or less than or equal to SQ...
C# Possible to create a pointer to a List? C# Powershell results c# Prevent sleep mode programmatically C# printing pdf file with System.Drawing.Printing problem. C# Problem - Why is the StreamReader skipping some lines C# process.start starts multiple instances everytime instead of one. c# pro...
JavaFX中setCellValueFactory报NullPointerException的原因有哪些?JavaFX中的setCellValueFactory方法用于设置表格列的值工厂。它接受一个回调函数,该函数根据表格的每一行返回相应的值。 在使用setCellValueFactory方法时,可能会遇到NullPointerException(空指针异常)的问题。这通常是由于未正确初始化表格列或未正确设置值工厂...
E_POINTER Pipeline参数为NULL。 WINBIO_E_BAD_CAPTURE 功能集未满足引擎适配器对标识操作的内部要求。 有关失败的详细信息由RejectDetail参数指定。 WINBIO_E_UNKNOWN_ID 管道中的功能集不对应于数据库中的任何标识。 注解 用于生成模板哈希的算法是此管道上最近调用EngineAdapterSetHashAlgorithm...
[ 477.872990] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 477.873022] PGD 0 P4D 0 [ 477.873032] Oops: 0000 [#1] SMP PTI [ 477.873045] CPU: 3 PID: 59 Comm: kworker/u16:2 Kdump: loaded Not tainted 4.18.0-305.el8.x86_64 #1 [ 477.873076] Hardware name:...
Having eliminated a large part of the code as a source of possible causes, we move on to a manual inspection of these lines. We are looking for code that would cause an existing node to become unlinked from the data structure. To unlink something is to make its pointer null. Show more...
StringLengthPtr can be set to a null pointer to set the SQL_DESC_OCTET_LENGTH_PTR field to a null pointer. IndicatorPtr [Deferred Input or Output] The value to which to set the SQL_DESC_INDICATOR_PTR field for the descriptor record. IndicatorPtr can be set to a null pointer to set ...