java - 如何将ArrayList转换为Array

Question

我有一个Person类

 public class Person 
        {
          private int age;
          private String first;
          private boolean valid;
        }

我创建了 Person 对象的 ArrayList

ArrayList<Person> valid = new ArrayList<Person>();
        for(Person p : in)
        {
         valid.add(p);
        }

现在我想将这个ArrayList转换为一个数组；我已经尝试过:

Person[] people = (Person[]) valid.toArray();

但这会引发异常

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lcom.net.Person;

Answer 1

你必须做这样的事情

Person[] people = valid.toArray(new Person[valid.size()]);