问一个的java的类型转换问题?报错

                    <p>java.lang.reflect.Array工具类</p> 

    @Test
    public void testArray() {
        System.out.println(Arrays.toString(toArray(new String[]{"a", "b"})));
        System.out.println(Arrays.toString(toArray(new int[]{1, 2})));
        System.out.println(Arrays.toString(toArray(Arrays.asList(3L, 4L))));
    }

    public static Object[] toArray(Object object) {
        if (object == null) {
            return null;
        }
        if (object instanceof Object[]) {
            return (Object[]) object;
        }
        if (object.getClass().isArray()) {
            Object[] array = new Object[Array.getLength(object)];
            for (int i = 0; i < array.length; i++) {
                array[i] = Array.get(object, i);
            }
            return array;
        }
        if (object instanceof Collection) {
            Collection<?> collection = (Collection<?>) object;
            return collection.toArray();
        }
        if (object instanceof Iterable) {
            Iterable<?> iterable = (Iterable<?>) object;
            return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterable.iterator(), 0), false)
                    .toArray();
        }
        throw new IllegalArgumentException();
    }

                    <p>用包装类  例如int[] 包装成Integer[]</p>
                

                    <div class="ref">

引用来自“你不懂的吧”的评论

用包装类  例如int[] 包装成Integer[]

                        你输入这种可以啊  在我调用这种方法前包装一下也可以啊   不一定非得直接用Integer[]
                    

                    <p>有办法。例如，将一个整型数组转换为一个 Integer 类型的数组。</p> 

 Object[] transfer(int [] a){
      	Object [] obj = new Object[a.length];
      	for (int i=0;i<obj.length;i++)
      	obj[i] = new Integer(a[i]);
      	return obj;
      }

                    <div class="ref">

引用来自“canghailan”的评论

java.lang.reflect.Array工具类

    @Test
    public void testArray() {
        System.out.println(Arrays.toString(toArray(new String[]{"a", "b"})));
        System.out.println(Arrays.toString(toArray(new int[]{1, 2})));
        System.out.println(Arrays.toString(toArray(Arrays.asList(3L, 4L))));
    }

    public static Object[] toArray(Object object) {
        if (object == null) {
            return null;
        }
        if (object instanceof Object[]) {
            return (Object[]) object;
        }
        if (object.getClass().isArray()) {
            Object[] array = new Object[Array.getLength(object)];
            for (int i = 0; i < array.length; i++) {
                array[i] = Array.get(object, i);
            }
            return array;
        }
        if (object instanceof Collection) {
            Collection<?> collection = (Collection<?>) object;
            return collection.toArray();
        }
        if (object instanceof Iterable) {
            Iterable<?> iterable = (Iterable<?>) object;
            return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterable.iterator(), 0), false)
                    .toArray();
        }
        throw new IllegalArgumentException();
    }