CODEWITHSUNDEEP
javaalgorithm
Joseph Martínez
Joseph Martínez

Reputation: 57

Avoid going below index -1 with a for loop

How do I avoid going below 0 with this for loop ? When this loop executes, it checks if both the vehicle and the garage are in the same space. If not, it decrements the vehicle loop by --i to get the next available vehicle. when it reaches to index 0, it is going below index -1 causing the program to crash.

for (int i = vehicles.size() - 1; i >= 0;) {
        for (int j = 0; j < garage.size();) {
            if (this.garage.get(j).getSpace() == this.vehicles.get(i).getSpace()) {
                if (this.garage.get(j).garageRequest(vehicles.get(i).getvehiclesType())
                        && this.garage.get(j).getLimit() > 0) {
                    this.garage.get(j).addvehicles(vehicles.get(i));
                    this.vehicles.remove(i);
                    i--;

                    break;
                } else {
                    j++;
                }
            } else {

                i--;
                j = 0;

            }

        }

i tried the following at the end

else if(i != 0) {
         i--;
         j = 0;

        }

Upvotes: 0

Views: 43

Answers (1)

Elliott Frisch
Elliott Frisch

Reputation: 201447

Add a second condition to your inner loop. That is, change

for (int j = 0; j < garage.size();) {

to

for (int j = 0; j < garage.size() && i >= 0;) {

Upvotes: 1

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