Test for all empty Strings in LinkedHashMap<String,ArrayList<String>

[albertkao]

For the LinkedHashMap<String,ArrayList<String> data type, how to find out whether all the Strings in ArrayList are empty/null?

I tried the following code:

public void setProductList(LinkedHashMap<String,ArrayList<String>> productList) {
   Set st = productList.keySet();
   Collection<ArrayList<String>> st2 = productList.values();
   // what should be the code to find out whether all the Strings in st2 are empty/null?

   System.out.println("productList " +productList + " size " + productList.size() );
   System.out.println("st " + st.size());
   System.out.println("st2 size " + st2.size());
   System.out.println("st2 " + st2);
   System.out.println("st2 null " + st2.containsAll(null));
}

Output is:
productList {PC=[], Mac=[]} size 2
st 2
st2 size 2
st2 [[], []]

What should be the code to find out whether all the Strings in st2 are empty/null?

[KevinWorkman]

Crossposted: Test for all empty Strings in LinkedHashMap<String,ArrayList><String> (Beginning Java forum at JavaRanch)