Question

public static void main(String[] args) throws FileNotFoundException {
    double agentID;
    String type;
    double price;
    Set<String> types = new TreeSet<String>();
    Map<Double, Double> agents = new TreeMap<Double, Double>();
    Scanner console = new Scanner(System.in);     
    String propertyID;
    double totalPrice = 0;

    System.out.print ("Please enter file name: ");
    String inputFileName = console.next();
    File inputFile = new File(inputFileName);
    Scanner in = new Scanner(inputFile);
    while (in.hasNextLine()) {
        propertyID = in.next();
        type = in.next(); 
        price = in.nextDouble();
        agentID = in.nextDouble();
        type = type.toUpperCase();   
        types.add(type);
        if (agents.containsValue(agentID)) {
            agents.put(agentID, agents.get(agentID)+price);
        }
        else {
            totalPrice = price;
            agents.put(agentID, totalPrice);
        }
    }
    in.close();
    System.out.println(types);
    System.out.println(agents);
}

I am trying to update map value of totalPrice if the value in agentID is already contained in the agents map. When I run the program it will output the initial value assigned to the key agentID but it will not output the totalPrice + price. I have looked over the questions here and looked over the API Docs, but I am not making any progress. Any help would be appreciated.

Answer 1

It seems that you are trying to map the agentId with the price. So I think what you need to use is

if (agents.containsKey(agentID)) { ... }

See the official containsKey javadoc for more information.

Please try to simplify the code in your questions (remove the file reading and other unneeded info) to make it easier to determine where the problem could be.