How to check Boolean for null?

Question

I want to add a null check to my ternary operator which checks on a Boolean isValue:

public String getValue() {
    return isValue ? "T" : "F";
}

My task is:

What if the Boolean(object) return null? Add a boolean check and return "" (empty String in case if its null).

Note that isValue is a Boolean, not boolean.

Answer 1

A terniary operator has the following syntax:

result = expression ? trueValue : falseValue;

Where trueValue is returned when the expression evaluates to true and falseValue when it doesn't.

If you want to add a null check such that when a Boolean isValue is null then the method returns "", it isn't very readable with a terniary operator:

String getValue() {
    return isValue == null ? "" : (isValue ? "T" : "F");
}

A statement like that could be better expressed with if statements. The body of the method would become

final String result;
if (isValue == null) {
    result = "";
} else if (isValue) {
    result = "T";
} else {
    result = "F";
}
return result;