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@LeoHeo

LeoHeo/1_hashCode.java

Last active June 10, 2018 05:20
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1_hashCode.java
@Override
public int hashCode() {
return Objects.hash(getId());
}
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2_test.java
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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