My code snippet:

if (answer) {
 TourRequest tour = new TourRequest();
}

After the above statement, I want to declare tour object, using a different constructor if it hasn't already been declared inside the curly brackets.

How can I check directly if tour exist, without using the content of the answer variable?

CodePudding user response：

Declare the variable outside of the if statement and then check if it is null.

TourRequest tour = null;
if(answer) {
  tour = new TourRequest();
}

if(tour == null) {
  tour = new TourRequest(/*params...*/);
}

Better yet, just use an else.

TourRequest tour;
if(answer) {
  tour = new TourRequest();
}
else {
  tour = new TourRequest(/*params...*/);
}

CodePudding user response：

the simplified solution is here

TourRequest tour = answer ? new TourRequest() : new TourRequest(parameter);