There are a few methods to empty an array. They are:
- Method 1:
arrayList = 
If you do not have any references to the original array arrayList, this method is recommended. However, if you have previously referenced this array from a different variable, then the original reference array will be kept unchanged.
2. Method 2:
arrayList.length = 0;
By using this code, you are setting the array length to 0 thus emptying it of all updates of reference variables, going back to the original array.
3. Method 3:
This method can also be used to empty all the array including updates of all the references back to the original array.
4. Method 4:
This is also a great way to empty arrays but it is not a recommended method.