“An algorithm must be seen to be believed.” – Donald Knuth
In C# the ?? operator is called the null-coalescing operator.
Here’s an example of use:
string result = leftHand ?? rightHand ;
It returns the left-hand operand if it is not null, otherwise it returns the right-hand operand.
A possible alternative in Java of C# ?? use ? , the ternary operator, like this:
String result = leftHand != null ? leftHand : rightHand;
Or, by using a method like this:
String nullCoalescingOperator(String leftHand, String rightHand) {
return leftHand != null ? leftHand : rightHand;
}