Why is my use of the ?: conditional operator incorrect?

Question

I get a compilation error while trying to compile, \"not a statement\", and the code is:

(checkDatabaseExist())?connectToDB() : buildDB();

when

Answer 1

As stated in JLS - Section 15.25 - Conditional Operator: -

It is a compile-time error for either the second or the third operand expression to be an invocation of a void method.

So, you must use an if-else construct to invoke your methods on different condition.

if (checkDatabaseExist()) {
    connectToDB();
} else {
    buildDB();
}