How to get a value inside an ArrayList java

Question

I am trying to get a value from with in an ArrayList  Here is a sample of my code    public static void main  String    args       Car toyota  new Car  Toyota     10000    300    2003        Car nissan  new Car  Nissan     22000    300    2011        Car ford  new Car  Ford     15000    350    2010         ArrayList lt Car gt  cars   new ArrayList lt Car gt         cars add toyota               cars add nissan       cars add ford      public static void processCar ArrayList lt Car gt  cars          in heare i need a way of getting the total cost of all three cars by calling          computeCars        System out println cars get         revision thanks all for the answers  I should probably add to the code a bit more  in the Car class  i have another method that is calculating the total cost including the tax    class Car       public Car  String name  int price  int  tax  int year           constructor                   public void computeCars             int  totalprice  price tax          System out println  name     t   totalprice   t  year                in the main class    public static void processCar ArrayList lt Car gt  cars       int totalAmount 0      for  int i 0  i lt cars size    i             cars get i  computeCars             totalAmount         in need to add the computed values of totalprice from the  Car class            Thanks again

User · Answer

You haven t shown your Car type  but assuming you d want the price of the first car  you could use   public static void processCars ArrayList lt Car gt  cars        Car car   cars get 0       System out println car getPrice         Note that I ve changed the name of the list from car to cars - this is a list of cars  not a single car   I ve changed the method name in a similar way    If you only want the method to process a single car  you should change the parameter to be of type Car   public static void processCar Car car    and then call it like this      In the main method processCar cars get 0      If you do leave it as processing the whole list  it would be worth generalizing the parameter to List lt Car gt  - it s unlikely that you ll really require that it s an ArrayList lt Car gt

User · Answer

Assuming your Car class has a getter method for price  you can simply use  System out println  car get i  getPrice       where i is the index of the element   You can also use  Car c   car get i   System out println  c getPrice       You also need to return totalprice from your function if you need to store it  main  public static void processCar ArrayList lt Car gt  cars       int totalAmount 0      for  int i 0  i lt cars size    i             int totalprice  cars get i  computeCars             totalAmount   totalprice             And change the return type of your function  public int computeCars         int  totalprice  price tax      System out println  name     t   totalprice   t  year        return  totalprice

User · Answer

import java util    import java lang    import java io     class hari   public static void main  String   args  throws Exception    Scanner s new Scanner System in       int i 0      int b 0      HashSet lt Integer gt  h new HashSet lt Integer gt         try          for i 0 i lt 1000 i            b s nextInt            h add b                   catch Exception e           System out println h     h size

User · Answer

You should name your list cars instead of car  so that its name matches its content   Then you can simply say cars get 0  getPrice    And if your Car class doesn t have this method yet  you need to create it

User · Answer

main class  public class Test       public static void main  String    args           Car thisCar  new Car   Toyota     10000    2003              ArrayList lt Car gt  car  new ArrayList lt Car gt              car add thisCar            processCar car               public static void processCar ArrayList lt Car gt  car           for Car c   car               System out println  c getPrice                         car class  public class Car       private String vehicle      private String price      private String model       public Car String vehicle  String price  String model           this vehicle   vehicle          this model   model          this price   price             public String getVehicle             return vehicle             public String getPrice             return price             public String getModel             return model

User · Answer

If you want to get the price of all cars you have to iterate through the array list   public static void processCars ArrayList lt Cars gt  cars       for  Car c   cars           System out println  c getPrice

User · Answer

The list may contain several elements  so the get method takes an argument   the index of the element you want to retrieve  If you want the first one  then it s 0   The list contains Car instances  so you just have to do  Car firstCar   car get 0   String price   firstCar getPrice      or just  String price   car get 0  getPrice      The car variable should be named cars  since it s a list and thus contains several cars   Read the tutorial about collections  And learn to use the javadoc  all the classes and methods are documented

[java] How to get a value inside an ArrayList java

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