Null-pointer exceptions will never be completely eradicated.
空指针异常将决不会被完全根除。
In many null-pointer exceptions, the true bug occurs where the variable is actually assigned to null.
在许多空指针异常中，真正的错误出现在变量被赋为空值的地方。
Unlike, for example, a class-cast exception, a null-pointer exception says nothing about what was expected instead of the null pointer.
例如，不像一个类转型异常，空指针异常不给出它所需要的内容的任何信息，只有一个空指针。
The contract was declared null and void.
合同被宣布无效。
A spokeswoman said the agreement had been declared null and void.
一位女发言人说那个协议已被宣布为无效的。
That vector is called a "null vector".
那种矢量就叫做”零矢量“。
If the XML parser sees a null character in its input, it throws an exception and stops processing.
如果XML 分析程序在其输入中看到一个空字符，它就会发出异常并停止处理。
The breakup of the null can be ruled out as the cause of the sinking.
空值的分解可以排除为下沉的原因。
You can find more information about the wrapped array style in the article "Array Gotcha—Null Array vs. Empty Array".
您在《ArrayGotcha—Null Arrayvs.Empty Array》这篇文章中可以找到更多关于包装排列风格的信息。
This expression also removes all null characters and excess whitespace.
此表达式也会删除所有空字符和过量的空白。
Otherwise you must retain the null hypothesis.
否则您就必须使用该无效假设。
Null and default value Compression (V8 GA) : Compression for null, zero length data in variable length columns and system default value.
null值和缺省值压缩(V 8GA)：对变长列中的零长度空数据和系统缺省值进行压缩。
Constraints Supports, primary, foreign, unique, not null constraint.
约束支持主键、外键、惟一和非空约束。
Make sure you are not accessing null pointer.
确保您不是在访问空指针。
We added the NOT NULL flag to indicate that the fields must not be null.
我们添加了NOTNULL标志来指示字段必须不能为空。
If you return a null array, the clients of the code must write extra code to check whether the return value is null (as shown in Listing 13).
如果您返回零数组，该代码的客户端必须编写额外的代码来检查返回值是否为零(如清单13所示)。
Any variables that are not mandatory can be null.
任何非必需的变量都可以为空。
Always be prepared for null namespaces on qualified names.
始终准备好处理限定名称上的空名称空间。
The application server returns null unless the user has authenticated properly.
应用服务器将返回空值，除非用户具备认证属性。
If the object argument is null, you need to generate a null accessor for the type.
如果对象参数为空，您需要为这个类型生成一个空访问器。
Substituting for null or unset variables.
替换空变量或未设置的变量。
If the column is defined as null capable, then you must update the null indicator map accordingly.
如果列被定义为支持空值，那么您必须相应更新空指示符映射。
That means a reference type can have a null pointer, but a value type cannot have a null value.
这意味着引用类型可能有空指针，但是数值类型不能有空值。
This new validation will enforce NOT null column constraints by rejecting null values, but only in situations where your database would reject a null value.
这种校验会通过拒绝空值，强迫加上非空[notNULL]字段的约束，但是也只有在这种情况下，你的数据库会拒绝空值。
Unfortunately, many designers have still not learnt that the special null pointer or null object is an equally bad idea.
遗憾的是，许多设计者并没有认识到空指针或空对象带来的危害。
This parameter can be an empty string or NULL, if defaults should be picked.
如果应该使用默认值，那么这个参数可以是空字符串或NULL。
If this time is null, subscription is considered to be infinite.
如果这个时间为空，则认为订阅是无期限的。
But usually these attributes are not needed, so specifying NULL is the norm.
但是通常并不需要这些属性，所以正常做法是指定NULL。
But usually these attributes are not needed, so specifying NULL is the norm.
但是通常并不需要这些属性，所以正常做法是指定NULL。
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