[Java知识库]Java 集合转数组

public class TypeChange {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<Integer>();
        list.add(1);
        list.add(2);
        list.add(3);
        list.add(4);
        list.add(5);

        //需要用引用数据类型
        Integer[] arr1 =  list.toArray(new Integer[]{});
        for (Integer i : arr1) {
            System.out.println(i);
        }

        //默认是Object类型
        Object[] arr2 = list.toArray();
        for (Object o : arr2) {
            System.out.println(o);
        }
    }
}