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Can a getter return null?
While the method can still return null , which you have no control over, you immediately convert that null into an empty list. All your subsequent code is no longer required to assess whether or not a null value might have been passed.
What does a getter return?
The getter method returns the value of the attribute. The setter method takes a parameter and assigns it to the attribute. Getters and setters allow control over the values. You may validate the given value in the setter before actually setting the value.
How do you do null check for object in Java?
To check if it is null, we call the isNull() method and pass the object getUserObject as a parameter. It returns true as the passed object is null.
Can a getter be allowed to return a null value?
While the method can still return null, which you have no control over, you immediately convert that null into an empty list. All your subsequent code is no longer required to assess whether or not a null value might have been passed. This way, you don’t have to put ?? new List () every time you want to call GetEnumerable ().
When to use Ref locals and ref return values?
A reference return value allows a method to return a reference to a variable, rather than a value, back to a caller. The caller can then choose to treat the returned variable as if it were returned by value or by reference. The caller can create a new variable that is itself a reference to the returned value, called a ref local.
Can a local variable be returned by reference?
Attempting to return a local variable generates compiler error CS8168, “Cannot return local ‘obj’ by reference because it is not a ref local.” The return value cannot be the literal null. Returning null generates compiler error CS8156, “An expression cannot be used in this context because it may not be returned by reference.”
Which is the same variable returned by getcontactinformation?
Subsequent usage of p is the same as using the variable returned by GetContactInformation because p is an alias for that variable. Changes to p also change the variable returned from GetContactInformation.