[Solved] Add a method to an exited ArrayList

Question

Calling arrValue.get(i) fetches you the object of FuelData class at ith index in the arrValue arraylist.

Now, if the method getOdometer() is defined inside FuelData – You should be able to access it using the below statement

    arrValue.get(i).getOdometer("value1", "value2", "value3")

Make sure getOdometer method returns a string or atleast it returns something.

Also, as I noticed you mentiioned this method is not defined in FuelData. Then you should be fine doing the below

//create Instance Of This Other Class before the for loop
//then call `GetOdometer(String accountID, String deviceID, String timestamp)`
//make sure GetOdometer is returning something
//follow camel casing for naming methods

For example,

///create instance
OtherClass c = new otherClass();
for (int i = 0; i < arrValue.size(); i++) {
.
.
String detail = "Mức nhiên liệu:"
               + Math.round(arrValue.get(i).GetFuelLevel())
               + c.GetOdometer("value1", "value2", "value3")

Try above code change only if GetFuelLevel methods behavior is same for all the objects of this OtherClass. Otherwise move

OtherClass c = new otherClass();

inside the for loop. Let me know in the comments if it does not work.

Accepted Answer