In Apex, which is the programming language used by Salesforce for building custom applications on the Salesforce platform, a null check is a common practice to ensure that a variable or an object reference is not null before attempting to access its properties or methods. Performing a null check helps prevent null pointer exceptions, which can occur when trying to perform operations on a null object.
Here's a basic example of a null check in Apex:
String StringA = 'Hello, Salesforce!';
String StringB = null;
if (StringA != null) {
System.debug('StringA is not NULL. The length of StringA is ' + StringA.length());
} else {
System.debug('StringA is null');
}
if (StringB != null) {
System.debug('StringB is not NULL. The length of StringB is ' + StringB.length());
} else {
System.debug('StringB is null');
}
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