java - Java中List.of()生成什么类型​​的列表

Question

Employee john = new Employee("John", "Brown", 32, 100);
Employee camila = new Employee("Camila", "Smith", 25, 101);
Employee pat = new Employee("Pat", "Hanson", 23, 102);

List<Employee> employeeList = List.of(john, camila, pat);

List.of() 方法生成什么类型​​的List。它是 ArrayList 还是 LinkedList？

Answer 1

都不是。根据 List.of() 的文档它返回:

Returns an immutable list containing an arbitrary number of elements.

请注意，这是界面 List ArrayList 和 LinkedList 实现

如果我们运行这段代码:

List<Integer> listOf = List.of(1,2,3);
System.out.println(listOf.getClass());

我们得到:

class java.util.ImmutableCollections$ListN