/**
* @program JavaBooks
* @description: Student
* @author: mf
* @create: 2020/02/07 02:07
*/
package com.java8;
import java.util.HashSet;
import java.util.Objects;
/**
* HashCodeã€equalså’Œ==
*/
public class Student {
private Long id;
private String name;
private Integer age;
public Student(Long id, String name, Integer age) {
this.id = id;
this.name = name;
this.age = age;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Student student = (Student) o;
System.out.println("name:" + this.getName() + "-->equals:" +
(Objects.equals(id, student.id) && Objects.equals(name, student.name)) + " " + student.getName());
return Objects.equals(id, student.id) &&
Objects.equals(name, student.name) &&
Objects.equals(age, student.age);
}
@Override
public int hashCode() {
System.out.println("name:" + this.getName() + "-->hashcode:" + Objects.hash(id, name));
return Objects.hash(id, name, age);
}
public static void main(String[] args) {
Student student = new Student(1L, "Mai", 16);
Student student1 = new Student(1L, "Mai", 16);
// System.out.println(student == student1);
// System.out.println(student.equals(student1));
Student student2 = new Student(2L, "Liu", 18);
HashSet