Java实现学生信息查询方法详解

public class Student {
    private String id;
    private String name;
    private int age;
    private String major;

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

    // Getter方法，便于访问属性
    public String getId() { return id; }
    public String getName() { return name; }
    public int getAge() { return age; }
    public String getMajor() { return major; }

    @Override
    public String toString() {
        return "学号：" + id + "，姓名：" + name + "，年龄：" + age + "，专业：" + major;
    }
}

import java.util.ArrayList;
import java.util.List;

List students = new ArrayList<>();
students.add(new Student("001", "张三", 20, "计算机"));
students.add(new Student("002", "李四", 21, "数学"));
students.add(new Student("003", "王五", 19, "计算机"));

public void queryByName(List list, String name) {
    for (Student s : list) {
        if (s.getName().contains(name)) {
            System.out.println(s);
        }
    }
}

public Student queryById(List list, String id) {
    for (Student s : list) {
        if (s.getId().equals(id)) {
            return s;
        }
    }
    return null; // 未找到返回null
}

public void queryByMajor(List list, String major) {
    for (Student s : list) {
        if (s.getMajor().equals(major)) {
            System.out.println(s);
        }
    }
}

import java.util.Scanner;

Scanner scanner = new Scanner(System.in);
System.out.print("请输入要查找的学生姓名：");
String inputName = scanner.nextLine();
queryByName(students, inputName);