Search for a sets elements in Java

Forums:

HashSet<Character> chars =  
    new HashSet<Character>(Arrays.asList('A''B''C''D'));
boolean containA = chars.contains('A');
//containA is true

boolean containE = chars.contains('E');
//containE is false

HashSet<Character> chars2 =  
new HashSet<Character>(Arrays.asList('A''B'));
boolean containAll = chars.containsAll(chars2);
//containAll is true