Christian Carrión :
I'm currently trying to iterate through an arraylist of sets that contain strings. It looks like this:
ArrayList<Set<String>> e = new ArrayList<Set<String>>(Size);
for(int i = 0; i < e.size(); i++) {
for(Object obj: e) {
System.out.println(e);
}
}
I'm trying to access and modify the strings inside the set (Printed beforehand to see if it worked), but I can't find a way to get to them. Any ideas?
tquadrat :
You cannot modify a String; if you want to change one of the Strings in the Set
s, you have to remove it and to add the new one.
Regarding the (simple) iteration:
for( var set : e )
{
for( var string : set )
{
out.println( string );
}
}
If you want to change the contents of your data structure:
for( var set : e )
{
Set<String> newStrings = new HashSet<>();
for( var i = set.iterator(); i.hasNext(); )
{
var string = i.next();
if( isInvalid( string ) )
{
i.remove();
newStrings.add( calculateNewString( string ) );
}
}
set.addAll( newStrings );
}