蜡烛的美是绝唱的美,它以自焚的痛苦将自己化为光和热,照亮了别人。——鲁迅
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| HashSet<String> hashSet = new HashSet<>(Arrays.asList("0", "1", "2")); HashSet<String> hashSet2 = new HashSet<>(Arrays.asList("1", "2", "3"));
hashSet.retainAll(hashSet2); hashSet.forEach(System.out::println); System.out.println(); HashSet<String> hashSet3 = new HashSet<>(Arrays.asList("0", "1", "2"));
hashSet3.addAll(hashSet2); hashSet3.forEach(System.out::println); System.out.println(); HashSet<String> hashSet4 = new HashSet<>(Arrays.asList("0", "1", "2"));
hashSet4.removeAll(hashSet2); hashSet4.forEach(System.out::println);
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