Variable parameter class?

Question

Following code

    public static void main(String[] args) {
        fun(new Integer(1));
    }
    static void fun(Object ... a) {
        System.out.println(a.getClass());
    }

gives the result: -

class [Ljava.lang.Object;

What is this class?

Answer 1

an array Object[].

To get runtime type information:

a.getClass().isArray() -> true
a.getClass().getComponentType().getName() -> java.lang.Object

Answer 2

according to the JVM specification , it is just an java.lang.Object array :

• [ means monomeric array
• LfullyQualifiedName; means class L; it's just the syntax

Answer 3

varargs ( ) Java - varargs .