创建学生类Student,包含学号，姓名，性别和年级。 a、使用ArrayList，添加5名学生，遍历展示学生信息。 b、使用Map，添加5名学生。 key是学号，value是学生对象。 c、（选做）使用HashSet存储5名学生，实现去重。学号相同则认为是同一个学生。 提示：重写equeals和hashcode

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a、创建一个名为Student的类，包含学号，姓名，性别和年级四个属性。然后创建一个ArrayList，将五名学生添加到列表中。最后，使用循环遍历该列表并展示每个学生的信息。

代码示例：

import java.util.ArrayList;

public class Student {
    private String id;
    private String name;
    private String gender;
    private int grade;

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    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 getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }
}

public class Main {
    public static void main(String[] args) {
        ArrayList<Student> students = new ArrayList<>();

        students.add(new Student("001", "张三", "男", 1));
        students.add(new Student("002", "李四", "女", 2));
        students.add(new Student("003", "王五", "男", 3));
        students.add(new Student("004", "赵六", "女", 4));
        students.add(new Student("005", "钱七", "男", 5));

        for (Student student : students) {
            System.out.println("学号：" + student.getId() + "，姓名：" + student.getName() + "，性别：" + student.getGender() + "，年级：" + student.getGrade());
        }
    }
}

b、创建一个名为Student的类，包含学号，姓名，性别和年级四个属性。然后创建一个Map，将五名学生添加到该Map中，其中key是学号，value是学生对象。最后，使用循环遍历该Map并展示每个学生的信息。

代码示例：

import java.util.HashMap;
import java.util.Map;

public class Student {
    private String id;
    private String name;
    private String gender;
    private int grade;

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    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 getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }
}

public class Main {
    public static void main(String[] args) {
        Map<String, Student> studentMap = new HashMap<>();

        studentMap.put("001", new Student("001", "张三", "男", 1));
        studentMap.put("002", new Student("002", "李四", "女", 2));
        studentMap.put("003", new Student("003", "王五", "男", 3));
        studentMap.put("004", new Student("004", "赵六", "女", 4));
        studentMap.put("005", new Student("005", "钱七", "男", 5));

        for (Map.Entry<String, Student> entry : studentMap.entrySet()) {
            Student student = entry.getValue();
            System.out.println("学号：" + student.getId() + "，姓名：" + student.getName() + "，性别：" + student.getGender() + "，年级：" + student.getGrade());
        }
    }
}

c、创建一个名为Student的类，包含学号，姓名，性别和年级四个属性。然后创建一个HashSet，将五名学生添加到该HashSet中，实现去重，即学号相同则认为是同一个学生。需要在Student类中重写equals和hashCode方法。

代码示例：

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

public class Student {
    private String id;
    private String name;
    private String gender;
    private int grade;

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    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 getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Student student = (Student) o;
        return Objects.equals(id, student.id);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id);
    }
}

public class Main {
    public static void main(String[] args) {
        Set<Student> studentSet = new HashSet<>();

        studentSet.add(new Student("001", "张三", "男", 1));
        studentSet.add(new Student("002", "李四", "女", 2));
        studentSet.add(new Student("003", "王五", "男", 3));
        studentSet.add(new Student("004", "赵六", "女", 4));
        studentSet.add(new Student("001", "钱七", "男", 5));

        for (Student student : studentSet) {
            System.out.println("学号：" + student.getId() + "，姓名：" + student.getName() + "，性别：" + student.getGender() + "，年级：" + student.getGrade());
        }
    }
}

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