我用的是jdk1.8

package com.test;import java.util.Arrays;import java.util.List;import java.util.Objects;/** * @author ygr * @description 覆写equals方法 * @date 2021/10/26 */public class EqualsTest {    public static void main(String[] args) {        List<Persone> list = Arrays.asList(new Person("Xiao", "Ming", 10), new Person("Xiao", "Hong", 41),                new Person("Bob", "Smith", 27));        int index = list.indexOf(new Persone("Xiao", "Hong", 41));
        System.out.println(index); //1    }}class Person {    String firstName;    String lastName;    int age;    public Person(String firstName, String lastName, int age) {        this.firstName = firstName;        this.lastName = lastName;        this.age = age;    }    public boolean equals(Object obj) {        if (obj instanceof Person) {            Person person = (Person) obj;            return Objects.equals(this.firstName, person.firstName) && Objects.equals(this.lastName, person.lastName) && this.age == person.age;        }        return false;    }}