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LinkedHashSet<Keyword> linkedHashSet = new LinkedHashSet<>();
Keyword keyword2 = new Keyword("han", null, 20, false, false);
linkedHashSet.add(keyword2);
Keyword keyword = new Keyword("han", null, 2, false, false);
linkedHashSet.add(keyword);
System.out.println(linkedHashSet);
如上输出的还是20的对象(Keyword中重写了equal和hashcode方法)