java编程请按以下要求顺序编码：定义学生类Student属性：姓名、性别、年龄定义测试类及main方法创建三个Student对象分别设置以下数据：张三男20李四女21张三男20定义一个存储Student类型的HashSet集合将上述对象存储到Set集合中要求集合中不能存储姓名性别年龄相同的元素。使用增强for遍历集合获取集合中每个Student对象并打印属性值；

1. 学生类Student的定义：

public class Student { private String name; private String gender; private int age;

public Student(String name, String gender, int age) {
    this.name = name;
    this.gender = gender;
    this.age = age;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getGender() {
    return gender;
}

public void setGender(String gender) {
    this.gender = gender;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

@Override
public boolean equals(Object obj) {
    if (obj == this) {
        return true;
    }
    if (!(obj instanceof Student)) {
        return false;
    }
    Student s = (Student) obj;
    return s.name.equals(name) && s.gender.equals(gender) && s.age == age;
}

@Override
public int hashCode() {
    return Objects.hash(name, gender, age);
}

}

2. 测试类及main()方法的定义：

import java.util.HashSet; import java.util.Set;

public class Test { public static void main(String[] args) { Student s1 = new Student("张三", "男", 20); Student s2 = new Student("李四", "女", 21); Student s3 = new Student("张三", "男", 20);

    Set<Student> set = new HashSet<>();
    set.add(s1);
    set.add(s2);
    set.add(s3);

    for (Student s : set) {
        System.out.println("姓名：" + s.getName() + "，性别：" + s.getGender() + "，年龄：" + s.getAge());
    }
}

}

输出结果：

姓名：李四，性别：女，年龄：21 姓名：张三，性别：男，年龄：2