学生信息系统的数据搜索案例

package TEST;

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

//后台程序需要存储如上学生信息并展示，然后要提供按照学号搜索学生信息的功能。
public class Test {
    public static void main(String[] args) {

        //1.存入学生信息
        ArrayList students = new ArrayList<>();
        students.add(new Student("20180302", "叶孤城", 23, "护理一班"));
        students.add(new Student("20180303", "东方不败", 23, "推拿二班"));
        students.add(new Student("20180304", "西门吹雪", 26, "中药学四班"));
        students.add(new Student("20180305", "梅超风", 26, "神经科2班"));

        //输入所有学生信息
        System.out.println("所有学生信息如下：");
        for (int i = 0; i < students.size(); i++) {
            Student s = students.get(i);
            System.out.println("学号：" + s.getNum() + "tt" + "姓名：" + s.getName() +                        "tt" +"年龄：" + s.getAge() + "tt" + "班级：" + s.getBanji());
        }
        Scanner sc = new Scanner(System.in);

        while (true) {
            //用户输入需要查询的学生学号
            System.out.println("请输入您要查询的学生学号");
            String id = sc.next();

            //调用方法进行查询
            Student rs = getStudent(students, id);
            if (rs == null)
                System.out.println("查无此人");
            else {
                System.out.println("学号：" + rs.getNum() + "tt" + "姓名：" +                                      rs.getName() + "tt" +"年龄：" + rs.getAge() +                                         "tt" + "班级："  + rs.getBanji());
            }
        }
    }

    public static Student getStudent(ArrayList students, String num) {
        for (int i = 0; i < students.size(); i++) {
            Student s = students.get(i);
            if (num.equals(s.getNum())) {
                return s;
            }
        }
        return null;
    }
}