Java ArrayList replace at specific index

I need help with this java please. I created an ArrayList of bulbs, and I'm trying to replace a bulb at specific index with another bulb. So开发者_开发问答 with the following heading, how do I proceed?

public void replaceBulb(int index, Bulbs theBulb) {

}

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Check out the set(int index, E element) method in the List interface

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You can replace the items at specific position using set method of ArrayList as below:

list.set( your_index, your_item );

But the element should be present at the index you are passing inside set() method else it will throw exception.

Also you can check oracle doc here

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Use the set() method: see doc

arraylist.set(index,newvalue);

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Use ArrayList.set

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public void setItem(List<Item> dataEntity, Item item) {
    int itemIndex = dataEntity.indexOf(item);
    if (itemIndex != -1) {
        dataEntity.set(itemIndex, item);
    }
}

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Lets get array list as ArrayList and new value as value all you need to do is pass the parameters to .set method. ArrayList.set(index,value)

Ex -

ArrayList.set(10,"new value or object")