Java中Arrays.asList()方法详解及实例

public class Test {
 public static void main(String[] args) {
  int[] a = {1, 2, 3, 4};
  List list = Arrays.asList(a);
  System.out.println(list.size()); //1
 }
}

/**
 * Returns a fixed-size list backed by the specified array. (Changes to
 * the returned list "write through" to the array.) This method acts
 * as bridge between array-based and collection-based APIs, in
 * combination with {@link Collection#toArray}. The returned list is
 * serializable and implements {@link RandomAccess}.
 *
 * <p>This method also provides a convenient way to create a fixed-size
 * list initialized to contain several elements:
 * <pre>
 *   List&lt;String&gt; stooges = Arrays.asList("Larry", "Moe", "Curly");
 * </pre>
 *
 * @param a the array by which the list will be backed
 * @return a list view of the specified array
 */
@SafeVarargs
public static <T> List<T> asList(T... a) {
 return new ArrayList<>(a);
}

public class Test {
 public static void main(String[] args) {
  Integer[] a = {1, 2, 3, 4};
  List list = Arrays.asList(a);
  System.out.println(list.size()); //4
 }
}