4、Neither a key nor a value can be null (if a null value in a dictionary is required, use "NSNull" instead).
8、If the corresponding class, field, or method is not generic, a null value is passed when calling the method.
12、IllegalArgumentError is thrown every time an argument is not considered valid, for example, when a null value is passed to a method as a parameter.
16、The procedure can return null or non-null values.
3、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.
9、If the return type of the method is nullable, the distinguished null value for the type is returned.
14、A filter function takes as input the unmodified data, and returns modified data (or in some cases, a null value to indicate the data should be deleted or disregarded).
2、That means a reference type can have a null pointer, but a value type cannot have a null value.
10、An error could occur in the first test and prevent the variable's value from being set, thus resulting in the other tests receiving a null value.
17、Primary keys do not allow null values.
7、In effect, such a null value is a type of data column overloading, and in this context, a null value might be understood to represent some aspect of the data.
1、The String element, s[1], is assigned a null value.
13、If the remote data source cannot handle the null value in a host variable or parameter marker, any function that involves binding a nullable value has to be evaluated locally.
11、For fields without signatures, I'll just use a null value. Finally, the field type is an instance of the TypeDescription class, also shown in Listing 1.
15、This is a good start, but you need to provide something other than a null value when the Tree Viewer asks for the column text for a particular item.
6、Click on CustomerRecord , and you will see a non-null value appear as the value in the parameters area.
5、The expression may be a null value if the parameter is nullable.
