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| @Override | |
| public int hashCode() { | |
| return Objects.hash(getId()); | |
| } |
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| Set<Student> studentSet = new HashSet<>(); | |
| studentSet.add(leo1); | |
| studentSet.add(new Student(1L, "Leo")); | |
| System.out.println("studentSet size => " + studentSet.size()); // studentSet size => 1 |
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