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Java HashSet 重写 equals() 和 hashCode() 对象去重

news 2025/8/2 20:10:09

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Ailt + Insert 选择 equals() 和 hashCode()

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package com.zhong.collection.set;import java.util.HashSet;
import java.util.Objects;public class HashSetDeduplication {public static void main(String[] args) {// HashSet 对象去重HashSet<Student> students = new HashSet<>();students.add(new Student("小钟", 22));students.add(new Student("小钟", 22));students.add(new Student("小王", 21));students.add(new Student("张三", 60));students.add(new Student("张三", 80));for (Student student : students) {System.out.println(student);}}}
class Student {private String name;private int age;// 重写 equals 和 hashCode@Overridepublic boolean equals(Object o) {if (this == o) return true;if (o == null || getClass() != o.getClass()) return false;Student student = (Student) o;return age == student.age && Objects.equals(name, student.name);}@Overridepublic int hashCode() {return Objects.hash(name, age);}public Student() {}public Student(String name, int age) {this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Student{" +"name='" + name + '\'' +", age=" + age +'}';}
}