How can I iterate over a string in Java?

Question

public static Boolean cmprStr( String s1, String s2 )
{
    // STUFF
}

I want to iterate through s1 to make sure that every character in s1 is incl

Answer 1

  for(char c: s1.toCharArray()){
     if(s2.indexOf(c) == -1){
           return false;
     }
  }
  return true;

Assuming that

  s1 = "aabb";
  s2 = "ccddaannbbss";

will return true.