null reference
英 [nʌl ˈrefrəns]
美 [nʌl ˈrefrəns]
网络 空引用; 不存在空引用; 没有空引用; 空参考; 空援用
双语例句
- In Java, it is a common practice to assign a null value to a reference type when it is not referencing any object.
在Java中，当引用类型没有引用任何对象时将其赋空值，这是公共的操作。 - SDOs can have data object properties that can be any of the simple PHP scalar types: string, integer, float or Boolean, as well as NULL or a reference to another SDO.
SDO的数据对象属性可为任意简单PHP标量类型：字符串、整型、浮点、布尔，还可以是NULL或另一个SDO的引用。 - To avoid this problem, you can define a complex type to wrap the value type and set the complex type to be null to indicate a null reference.
为了避免这个问题的出现，您可以定义复合类型来封装数值类型，并将这个复合类型置为空来表示空引用。 - If the weak reference has been cleared ( either because the referent has already been garbage collected or because someone called WeakReference. clear()), get() returns null.
如果弱引用被清除了（不管是referent已经被垃圾收集了，还是有人调用了WeakReference.clear（）），get（）会返回null。 - In the case where a retrieved column has a value of SQL NULL, then no XPath variable reference expression is assigned to such a value.
如果检索到的列值为SQLNULL，那么不会给此类值分配任何XPath变量引用表达式。 - Finally, say goodbye to the dull, everyday drudgery of null reference exceptions.
最后，告别那些处理空引用异常的枯燥差事吧。 - What you get in your arguments are a reference to the "this" object ( this is for object methods and is NULL for plain old functions like bar()) and an argument tuple in args.
您从参数中得到的是一个对“this”对象的引用（this用于对象方法，对类似bar（）这样的无参数的老式函数来说是NULL）和一个存储在args中的参数元组。 - Dead mappings could be eliminated by periodically scanning the Map, calling get() on each weak reference, and removing the mapping if get() returns null.
可以通过周期性地扫描Map，对每一个弱引用调用get（），并在get（）返回null时删除那个映射而消除死映射。 - Containing the name of the file with the invalid image, or a null reference if no file name was passed to the constructor for the current instance.
包含具有无效图像的文件的名称；或者，如果没有将文件名传递给当前实例的构造函数，则为空引用。 - In the case of eg.a singleton pattern using the constructor this can have severe consequences and lead to seemingly random null reference exceptions.
单一模式使用构造函数可能会导致严重后果，会带来类似随机的空参数异常。 - A null reference pointer was passed to the stub. The most familiar measure of the moisture content of air is relative humidity.
最为人熟悉的空气湿度指针是相对湿度。 - When Java sees null, it recognizes that the reference in question isn't pointing to an object.
一旦Java看到null，就知道该句柄并未指向一个对象。 - Not only does it have the same "null reference exception" that Java had, with generics we also were given the problems with Nullable value types.
它不仅提供了Java所拥有的“空引用异常”，而且还提供了Nullable值类型以解决通用的问题。 - If a pointer pointing to an object not in the graph, then the object is not a reachable object, and then garbage collector sets the slot to null in the short weak reference table.
如果一个指针指向一个不在图中的对象，那么此对象就是一个不可到达的对象，垃圾收集器就将短弱引用表相应的槽置空。 - The instance variables have not yet received any values and therefore have a value of nil ( no reference).
由于实例变量还没有接受到任何的赋值，所以就有一个NULL的数值（没有参考索引）。 - The common errors include memory leak, memory-access errors, repeated free memory, null pointer reference, and so on.
常见的错误有内存泄漏、内存读写越界，内存的重复释放、空指针引用等。