Search for a sets elements in Java
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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
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