Question

I’m getting the following error on the line where it says ht.keySet():

Type mismatch: cannot convert from element type Object to int

ht is a LinkedHashMap.

for (int key : ht.keySet())
{
    if(ht.get(key).size() == 0)
    {
         System.out.println("There is no errors in " + key) ;
    }
    else
    {
        System.out.println("ERROR: there are unexpected errors in " + key);
    }
}

Answer 1

You need to use Java generics.

Declare ht as a LinkedHashMap<Integer, Foo> where Foo is whatever data type you expect to be returned by ht.get(). Using the Map interface would be even better:

LinkedHashMap<Integer, Foo> ht = new LinkedHashMap<Integer, Foo>();
// or preferably
Map<Integer, Foo> ht = new LinkedHashMap<Integer, Foo>();