Sets operations in Java
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HashSet<Integer> first = new HashSet<Integer>(Arrays.asList(1, 2, 3));
HashSet<Integer> second = new HashSet<Integer>(Arrays.asList(3, 4, 5));
first.addAll(second);
//first is { 1, 2, 3, 4, 5 }
first.removeAll(second);
//first is { 1, 2 }
first.retainAll(second);
//first is { 3 }
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