import java.util.ArrayList; public class JMLArrayListExample { public ArrayList elements; public JMLArrayListExample () { elements = new ArrayList<String>(); } //@ ensures (elements.contains(s)); public void add(String s){ elements.add(s); } public static void main (String[] args){ System.out.println("wait"); JMLArrayListExample jale = new JMLArrayListExample(); jale.add("hello"); } }