how to replace the value in SET in apex

Question

I have a set in apex like this

set<string> myset = new set<string>();
mySet.add('this');
mySet.add('is');
mySet.add('the');
mySet.add('example');

now i want to replace the value in the set if there is 'the'... replace it with an.

this is just an example..my set will have different data but the requirement is similar.

if there is 'the' in set ..replace it with 'an'

Answer 1

First, check if it is present, second, remove found element, third, put replacement:

Set<String> mySet = new Set<String>();
mySet.add('this');
mySet.add('is');
mySet.add('the');
mySet.add('example');

String toReplace = 'the';
String repalceWith = 'an';

if(mySet.contains(toReplace)){
    mySet.remove(toReplace);
    mySet.add(repalceWith);
}

Pay attention, Set in apex does not preserve the order in which elements have been added to a Set.