java - Convert int, long, boolean, String, double in List (two variants), Set(two variants), Queue, Deque -

i have method convert array arraylist follows:

public class main {      //https://docs.oracle.com/javase/tutorial/extra/generics/methods.html     public static <t> void fromarraytocollection(t[] a, collection<t> c) {         (t o : a) {             c.add(o);         }     }      public static void main(string[] args) {         car [] cars = new car[2];         cars[0] = new car(1, "volvo", "2612axa");         cars[1] = new car(2, "toyota", "1861axa");          int [] = new int[2];         i[0] = 1;         i[1] = 1;          long [] l = new long[2];         l[0] = 122342141;         l[1] = 214214211;          double [] d = new double[2];         d[0] = 1.0;         d[1] = 2.0;          boolean [] b = new boolean[2];         b[0] = true;         b[1] = false;          string [] s = new string[2];         s[0] = "one";         s[1] = "two";          collection<string> sc = new arraylist<string>();         fromarraytocollection(s, sc);         system.out.println(sc);      } } 

it easy convert other types of array. have class 3 fields.

public class car {     int id;     string car_name;     string number;      public car(int id, string car_name, string number) {         this.id = id;         this.car_name = car_name;         this.number = number;     }      @override     public string tostring() {         return "car{" +                 "id=" + id +                 ", car_name='" + car_name + '\'' +                 ", number='" + number + '\'' +                 '}';     } } 

how convert array cars collection ? , how convert collections arrays using iterator? thanks.

car[] carsarray = new car[2];  ...   list<car> listofcars = arrays.aslist(carsarray);