Remove a String Item from a List of Strings

Question

How do I remove a specific string from a List that contains Strings....

As in:

ArrayList<String> myStrings = new ArrayList<>();
myStrings.add("Alpha");
myStrings.add("Beta");
myStrings.add("Gama");
.                           //The order can be random 
.
.
.

Now , I only have the list myStrings and I don't know which String is at which index. But I know, that I want to display all the strings after removing say "Alpha".

To Summarize , How can I get the strings from a String array after removing a String that I know that array contains , but don't know its index/position.

Answer 1

Use remove :

myStrings.remove("Alpha");

Note that this would only remove the first occurrence of "Alpha" from your list.

Answer 2

boolean remove(Object o)

The above method of ArrayList class will remove the first occurence of Object o from the list.

You can do:

myStrings.remove("Alpha");

It will return true if the ArrayList contained the specified element.

Answer 3

Do you have duplicates in the list of String that you also wish to remove?

If so, you can convert the list of String into a set of String. Then, you can remove strings from the set efficiently, convert it back into a map .

// converting to set will remove duplicates
final Set<String> uniqueStrSet = new HashSet<String>(listOfString);

// remove string from set
uniqueStrSet.remove(strToRemove);

// convert set back to list
list = new ArrayList<String>(uniqueStrSet);