java.util.EmptyStackException

Question

I have the following part of code to initialize an array of stack:

vDec.setRoute(new Stack[vDec.getIndexes().length]);
for(i=0;i<vDec.getIndexes().length;i++){
    vDec.getRoute()[i]=new Stack<>();
}

I get java.util.EmptyStackException when I am checking if it is empty inside a while loop but not before it. So for this part:

if(vDec.getRoute()[(int)IndexVeh.peek()].isEmpty()){
    System.out.println("it works");
}
while((cDec.getVisitedBy()[crtCust]==-1)&&(!Distance.empty())){
    if(vDec.getRoute()[(int)IndexVeh.peek()].isEmpty()){
        do something

I first get as output it works and then the exception.

Answer 1

On the line

     if(vDec.getRoute()[(int)IndexVeh.peek()].isEmpty())

You will get an EmptyStackException if and only if IndexVeh is empty when that line is executed.