用java实现输入学生的。学号姓名性别年龄，放入一个数组中，并可分别调研用

以下是一个简单的Java程序，可以实现输入学生信息，并将其存储在一个数组中。程序允许用户选择不同的操作，如按学号、姓名、性别或年龄排序，或显示所有学生信息。

import java.util.*;

class Student {
    String id;
    String name;
    String gender;
    int age;

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

    public String toString() {
        return id + "\t" + name + "\t" + gender + "\t" + age;
    }
}

public class StudentArray {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = 0;
        System.out.print("请输入学生人数：");
        n = scanner.nextInt();
        Student[] students = new Student[n];
        for (int i = 0; i < n; i++) {
            System.out.print("请输入第" + (i + 1) + "个学生的信息(学号 姓名 性别 年龄)：");
            String id = scanner.next();
            String name = scanner.next();
            String gender = scanner.next();
            int age = scanner.nextInt();
            students[i] = new Student(id, name, gender, age);
        }

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 按学号排序");
            System.out.println("2. 按姓名排序");
            System.out.println("3. 按性别排序");
            System.out.println("4. 按年龄排序");
            System.out.println("5. 显示所有学生信息");
            System.out.println("6. 退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    Arrays.sort(students, new Comparator<Student>() {
                        public int compare(Student s1, Student s2) {
                            return s1.id.compareTo(s2.id);
                        }
                    });
                    break;
                case 2:
                    Arrays.sort(students, new Comparator<Student>() {
                        public int compare(Student s1, Student s2) {
                            return s1.name.compareTo(s2.name);
                        }
                    });
                    break;
                case 3:
                    Arrays.sort(students, new Comparator<Student>() {
                        public int compare(Student s1, Student s2) {
                            return s1.gender.compareTo(s2.gender);
                        }
                    });
                    break;
                case 4:
                    Arrays.sort(students, new Comparator<Student>() {
                        public int compare(Student s1, Student s2) {
                            return s1.age - s2.age;
                        }
                    });
                    break;
                case 5:
                    System.out.println("学号\t姓名\t性别\t年龄");
                    for (Student s : students) {
                        System.out.println(s);
                    }
                    break;
                case 6:
                    System.exit(0);
                default:
                    System.out.println("无效操作，请重新选择。");
            }
        }
    }
}