满足条件时获取时间变量的实例

Question

I am looking for a way to take an instance of a time variable when the else of an if is called as in the situation below, so then I can pass this time taken into another method.

double time = getRunningTime();
...
if (..){

}
else{
  *TAKE AN INSTANCE OF VARIABLE TIME AT THIS POINT TO PASS TO ANOTHER
                           METHOD*
}

However, if I now pass this into another method by

else{
  methodToCall(time)
}

Then use this in the other method ie

methodToCall(double time){
   double timeMinusRunningTimeOfIfInPreviousMethod = getRunningTime() - time
   ....
}

the variable time will still be changing, however I want it to stay constant.

Thanks, Jack

Answer 1

From your comment,

Precisely. If i do that now the variable will still constantly change.

No, time will not change if you do that now. In fact, time never changes after the first line in your snippet. time is a value type of double . It does not hold a reference to some constantly changing object.

So what is constantly changing here? Presumably, the return value of getRunningTime . When you call the method at a different time, a different value will be returned. Judging from the name, I guess it returns how long has the program been running since some point in time.

Therefore, you probably want to do something like this instead:

someMethod(getRunningTime());

Or if getRunningTime returns the current time and you want to measure how long the if statement took to execute, you can do:

someMethod(getRunningTime() - time).