I have been working on this for ages now. I have an array list where many strings are in one index.
(index 0) Brand is: Nissan Colour is: Black ID is: KL1 Door is: 4
(index 1) Brand is: Ford Colour is: Red ID is: LL0 Door is: 4
I want the user to input only ID and it should remove the whole data in the index. Unfortunately Iterator won't work here. Any ideas how this can be done?
Use the basic object-oriented approach.
Create a class to represent each row of data, with four member fields: brand, color, id, door.
Parse each row of text to instantiate an object of that class. Collect the objects in a List.
Loop the list and interrogate each object for its id to match your desired id.
For speed in adding/deleting items, use a LinkedList rather than an ArrayList as your implementation of List.
You should create class that will contain those data related tor car. Take the following code as a example. I have used Java 8 feature that internally iterate over the list.
public class Main {
public static void main(String[] args){
List<Car> list = new ArrayList<>(Arrays.asList(new Car("Nissan", "Black", "KL1", "4"),
new Car("Ford", "Red", "LL0", "4")));
String id = "KL1";
list.removeIf(i -> i.getID().equals(id));
list.forEach(System.out::println); // show the list after operation
}
static class Car {
public final String Brand;
public final String Colour;
public final String ID;
public final String Door;
public Car(String brand, String colour, String ID, String door) {
Brand = brand;
Colour = colour;
this.ID = ID;
Door = door;
}
public String getBrand() {
return Brand;
}
public String getColour() {
return Colour;
}
public String getID() {
return ID;
}
public String getDoor() {
return Door;
}
}
}
Update
You can also do that by doing this
public static void main(String[] args){
List<Car> list = new ArrayList<>(Arrays.asList(new Car("Nissan", "Black", "KL1", "4"),
new Car("Ford", "Red", "LL0", "4")));
String id = "KL1";
// Following code will find and remove the match from the list.
// this for loop do exactly what it is doing "list.removeIf(i -> i.getID().equals(id));"
for (int i = 0; i < list.size(); i++) {
if (list.get(i).getID().equals(id)) {
list.remove(i);
break;
}
}
}
Storing the data in a string reminds me of good old times back in the 80s. Follow the advice of Basil Borque and then, to avoid concurrentmodificationexception, start at the end of the array. That way you can remove from a list and continue with the previous one, NOT the next one (which would cause the exception)
ArrayList<String>instead of anArrayList<Car>? That data should be a class with properties{String brand, String colour, String id, int doorCount}or something, with atoString()method that generates the text you show. It should not be a single string while you work with the data... removing onidbecomes almost trivially simpler that way, too.