OnJava8-Examples/generics/GenericVarargs.java

// generics/GenericVarargs.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;

public class GenericVarargs {
  @SafeVarargs
  public static <T> List<T> makeList(T... args) {
    List<T> result = new ArrayList<>();
    for(T item : args)
      result.add(item);
    return result;
  }
  public static void main(String[] args) {
    List<String> ls = makeList("A");
    System.out.println(ls);
    ls = makeList("A", "B", "C");
    System.out.println(ls);
    ls = makeList(
      "ABCDEFFHIJKLMNOPQRSTUVWXYZ".split(""));
    System.out.println(ls);
  }
}
/* Output:
[A]
[A, B, C]
[A, B, C, D, E, F, F, H, I, J, K, L, M, N, O, P, Q, R,
S, T, U, V, W, X, Y, Z]
*/