错误：不兼容的类型：ArrayList<Item> 无法转换为 Item[]

如何解决错误：不兼容的类型：ArrayList<Item> 无法转换为 Item[]

我是 Java 新手，并试图在没有比较器可比选项的情况下完成排序，但是收到错误错误：不兼容的类型：ArrayList 无法转换为 Item[]，谁能告诉我我要做什么不正确。还是我必须创建一个多维数组，然后使用我目前正在使用的方法导入到数组列表中。

private int serialNumber;
private String name;
private double unitPrice;

public Item(int sn,String n,double p) {
    serialNumber = sn;
    name = n;
    unitPrice = p;
}

public int getSerialNumber(){
    return serialNumber;
}

public String getName(){
    return name;
}

public double getUnitPrice(){
    return unitPrice;
}

公共类ManageItems {//开始主

public static void main(String[] args) {

    ArrayList<Item> iT = new ArrayList<Item>();

    Item i1 = new Item (1234,"Saw",153.75);//create item and add to array list
    iT.add(i1);
    iT.add(new Item(9876,"Hammer",47.50));
    iT.add(new Item(6432,"Drill",272.99));
    iT.add(new Item(4682,"I-Beam Level",240.00));
    iT.add(new Item(2909,"Shovel",75.00));

    sortSerialNumberAsc(iT);

}//end main

public static void sortSerialNumberAsc (Item[] arr){ //sort ascending order
    int n = arr.length;
    for (int i = 1; i < n; ++i) {//serialnumber loop start
        Item key = arr[i];
        int j = i - 1;

        while (j >= 0 && arr[j].getSerialNumber() > key.getSerialNumber()) {//serialnumber outer loop start
            arr[j + 1] = arr[j];
            j = j - 1;
        }//outer loop end

        arr[j + 1] = key;
    }//serialnumber loop end
}//end

 public static void sortSerialNumberDesc (Item[] arr){ //sort decending
    int n = arr.length;
    for (int i = 1; i < n; ++i) {//serialnumber loop start
        Item key = arr[i];
        int j = i - 1;

        while (j >= 0 && arr[j].getSerialNumber() < key.getSerialNumber()) {//serialnumber outer loop start
            arr[j + 1] = arr[j];
            j = j - 1;
        }//outer loop end

        arr[j + 1] = key;
    }//serialnumber loop end
}//end

public static void sortUnitPriceAsc (Item[] arr){ //sort unit price ascending
    int n = arr.length;

    for (int i = 1; i < n; i++){//start unit price loop

    Item key = arr[i];
    int j = i - 1;

        while (j >= 0 && arr[j].getUnitPrice() > key.getUnitPrice()) {//outer loop
            arr[j + 1] = arr[j];
            j = j - 1;
    }//outer loop end
        arr[j + 1] = key;
}//end unit price loop
}//end

public static void sortUnitPriceDesc (Item[] arr){//sort unit price descending
    int n = arr.length;

    for (int i = 1; i < n; i++){//start loop

    Item key = arr[i];
    int j = i - 1;

        while (j >= 0 && arr[j].getUnitPrice() < key.getUnitPrice()) {//outer loop
            arr[j + 1] = arr[j];
            j = j - 1;
}//outer loop end
        arr[j + 1] = key;

    }//end loop

}//end