How/Can I write a for each loop with a Hashmap in java?

Jose C. :

I need to iterate each value of a HashMap in my method but it gives me a syntax error at the for each loop

Library.java:12: error: for-each not applicable to expression type for(String book : library){ ^ required: array or java.lang.Iterable found: HashMap

This is the relevant code

public void getFinishedBooks(HashMap<String, Boolean> library)
{
  if(library.size()<1) 
  {
    System.out.println("Library is empty!");
  }
  else 
  {
    for(String book : library)
    {
      if(library.get(book) ==true)
      {
        System.out.println(book);
      }
    }
  }
}

ernest_k :

You can iterate over the set of entries:

for (Entry<String, Boolean> book : library.entrySet()) {
    if (book.getValue()) {
        System.out.println(book.getKey());
    }
}

Map.entrySet() returns a Set of entries (java.util.Map.Entry). Each entry contains a pair with a key and its value.