CODEWITHSUNDEEP
javaarraysarraylist
manish kumar
manish kumar

Reputation: 11

How to increment arraylist String value by one

There are two for loops and I want to increment array list value that is of string type by one from inner for loop. How I can do that?

ArrayList<String> location; //Location and distanceInMiles are ArrayList<String> type and i have store some value into it. 
ArrayList<String> distanceInMiles;
for(String strloc : location){
    for(String strDist : distanceInMiles){
        System.out.println("For Location :" + strloc + "Zip code 30303" + "Distance in Miles:" + strDist);// After print the value i want to increment strDist value by one
        break;
    }
}

Upvotes: 0

Views: 1485

Answers (4)

Aravinda Meewalaarachchi
Aravinda Meewalaarachchi

Reputation: 2629

Order to do that incrementation you have to change the algorithm by inserting a String to floating point conversion steps (I assume that distances are represented as floating points with in the string).

List<String> location; 
List<String> distanceInMiles;

for(String strloc : location){
   for(int i=0; i < distanceInMiles.size(); i++){
       String strDist = distanceInMiles.get(i);
       System.out.println("For Location :" + strloc + "Zip code 30303" + "Distance in Miles:" + strDist);
       double value = Double.parseDouble(strDist);
       value++;
       distanceInMiles.set(i, String.valueOf(value));
       break;
   }
}

Upvotes: 1

Sneha
Sneha

Reputation: 140

String can't be incremented. So instead of passing strDist string to PrintStream you can parse the string to an Integer and do something like this:

System.out.printf("For Location : %s, Zip code 30303. Distance in Miles: %d%n", strloc, Integer.valueOf(strDist) + 1);

Upvotes: 2

Fernando Ania
Fernando Ania

Reputation: 377

Arraylists can hold a list of Object so you can't iterate through it with the type String.

After fixing this, the strDist will still not proceed to the next iteration this is because of the break statement, remove it.

You can do something like the following:

for (Object strDist : distanceInMiles) {

            System.out.println("For Location :" +strloc+ "Zip code 30303" + "Distance in Miles:" + strDist);// After print the value i want to increment strDist value by one

             // remove break
        }

Upvotes: 0

Jack.LL
Jack.LL

Reputation: 41

    ArrayList<String> location; //Location and distanceInMiles are ArrayList<String> type and i have store some value into it.
    ArrayList<String> distanceInMiles;
    for(String strloc : location){
        ArrayList<String> clone = (ArrayList<String>) distanceInMiles.clone();
        distanceInMiles.clear();
        for(String strDist : clone){
            System.out.println("For Location :" + strloc + "Zip code 30303" + "Distance in Miles:" + strDist);// After print the value i want to increment strDist value by one
            distanceInMiles.add(Integer.parseInt(strDist) + 1 + "");
            break;
        }
    }

Hope it helps!

Upvotes: 3

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