public class ArrayTest2
{
    public static void main(String[] args)
    {
        Person[] p = new Person[3];

        //未生成物件時，引用型別均為空
        System.out.println(p[0]);


        //生成物件之後，引用指向物件
        p[0] = new Person(10);
        p[1] = new Person(20);
        p[2] = new Person(30);

        for(int i = 0; i < p.length; i++)
        {
            System.out.println(p[i].age);
        }

    }
}
 
class Person
{
    int age;
    public Person(int age)
    {
        this.age = age;

    }
}