Question

HashSet<String> noDuplicate = new HashSet<String>();
for(int i=0;i<strings.length;i++)
{
     for(int a=0;a<strings2.length;a++)
     {
         if(noDuplicate.get(i).equals(strings2[a]))
             //blahblah code here
     }
}

but get doesn’t work, i’m not sure how to use iterator if that’s the method to use to go through the elements of a hashset. I want to do something like:

for(int i=0;i<strings.length;i++)
{
     for(int a=0;a<strings2.length;a=a+2)
     {
         if(node_marked_array.get(i).equals(strings2[a]))
             //blahblah code here
     }
}

but I was told to use a hashset because of duplicate values.

Answer 1

Use HashSet#contains instead:

HashSet<String> noDuplicate = new HashSet<String>();
for(int i=0;i<strings.length;i++){
    for(int a=0;a<strings2.length;a++){
         if(noDuplicate.contains(strings2[a]))
         //blahblah code here
    }
}