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// Remove each to-do below:
// Remove "visit the crime scene" from
// sherlocksToDos and poirotsToDos using remove().
sherlocksToDos.remove("visit the crime scene");
poirotsToDos.remove("visit the crime scene");
// remove "play violin" from sherlocksToDos
sherlocksToDos.remove("play violin");
Is it possible to remove two items from Sherlock’s with one line of code?
I tried as below
sherlocksToDos.remove(0, 1);
and it gave me :
ToDos.java:27: error: no suitable method found for remove(int,int)
sherlocksToDos.remove(0, 1);
^
method Collection.remove(Object) is not applicable
(actual and formal argument lists differ in length)
method List.remove(Object) is not applicable
(actual and formal argument lists differ in length)
method List.remove(int) is not applicable
(actual and formal argument lists differ in length)
method AbstractCollection.remove(Object) is not applicable
(actual and formal argument lists differ in length)
method AbstractList.remove(int) is not applicable
(actual and formal argument lists differ in length)
method ArrayList.remove(int) is not applicable
(actual and formal argument lists differ in length)
method ArrayList.remove(Object) is not applicable
(actual and formal argument lists differ in length)
1 error
I wanted to try both solutions so below is how I wrote my code :
sherlocksToDos.remove(0);
sherlocksToDos.remove(0);
poirotsToDos.remove("visit the crime scene");
it wouldn’t allow me to write as below, as (I guess) I’ve already removed the 0 index with the first line of code :
sherlocksToDos.remove(0);
sherlocksToDos.remove(1);
poirotsToDos.remove(“visit the crime scene”);
So you can remove by specifying the index, or the value, to remove. That’s great and all, but the first thing that pops into my mind is, what if it is an array list of integers?
Will it remove the element at index 1, leaving me with 4, 0, 1? Or will it remove the element with the value 1, leaving me with 4, 12, 0? And whichever one of those ends up being the case, how do I make it work the other way if I need to?
Given you already have the code, would be simple to find out? Simple print the array list to see which value/index got removed. Or consult the documentation on the remove method (which very likely include the working of the method)
What if I declare an ArrayList of Integers, When I use .remove by specifying the value to remove my question is how Java differentiate between is it an index or is it a value remove?
It says we can remove using the index # or by specifying the value.
What would be the case if we were removing items from a integer array list. Would it assume that I want to remove a certain number or that I am referring to the index number, as they are both integers.
// Sherlock
ArrayList<String> sherlocksToDos = new ArrayList<String>();
sherlocksToDos.add("visit the crime scene");
sherlocksToDos.add("play violin");
sherlocksToDos.add("interview suspects");
sherlocksToDos.add("solve the case");
sherlocksToDos.add("apprehend the criminal");
// Poirot
ArrayList<String> poirotsToDos = new ArrayList<String>();
poirotsToDos.add("visit the crime scene");
poirotsToDos.add("interview suspects");
poirotsToDos.add("let the little grey cells do their work");
poirotsToDos.add("trim mustache");
poirotsToDos.add("call all suspects together");
poirotsToDos.add("reveal the truth of the crime");
// Remove each to-do below:
sherlocksToDos.remove(1);
poirotsToDos.remove(0);
sherlocksToDos.remove(0);
System.out.println(sherlocksToDos.toString() + "\n");
System.out.println(poirotsToDos.toString());
}
}
** It’s possible to remove members from the Array-list with their sequence number, but then you need to start removing from the highest number. If you remove the member 0, the last member in the position 1 transfer to the position 0, which changes the whole sequence.**
I know this is now a year old, but at this level I often find it quite difficult to find answers to basic coding questions using Google. In most cases the results that come up might contain the answer, but often in scenarios complicated enough that it’s hard for a relative beginner to be sure of the meaning.
Also, your question was exactly the same as my question, so I’m glad you asked it. I thought that was the whole point of this forum anyway.
I am currently reviewing all the lesson that I took before, and found out that I used to print ArrayList by adding .toString() method. Like the code below.
Problem is, both printed result was same.
So I want to know what actually happens when I add the .toString() method.
) below.
) to up-vote the contribution!