Java简单学生管理系统

Java简单学生管理系统
这个不需要手动输入，笔记记录
//student`

public  class student(){
 private  String id;//学号
 private String  name;//姓名
  private int age;//年龄
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 int getAge() {
    return age;
}

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

@Override
public String toString() {
    return "Student{" +
            "id='" + id + '\'' +
            ", name='" + name + '\'' +
            ", age=" + age +
            '}';
}

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

}
//studentManger

public class StudentManager {
  Student[] stus=new Student[20];//声明数组
 static int count=0;//学生数量
public void add(Student stu){
    stus[count] =stu;
    count++;
}

//查一条数据
public void  findByid(String id){
    for (int i = 0; i < stus.length; i++) {
        Student stu=this.stus[i];
        if (stu.getId().equals(id)){
            System.out.println(stu);
        }
    }
}
//查询所有
public  void  findAll(){
    for (int i = 0; i < count; i++) {
        System.out.println(stus[i]);
    }
}

//修改
public  void  udp(String id,Student student){
    for (int i = 0; i < stus.length; i++) {
        Student stu=this.stus[i];
        if (stu.getId().equals(id)){
            stus[i]=student;
            findAll();
        }
    }

}
//删除
public  void  del(String id){
    for (int i = 0; i < count; i++) {
        if (stus[i].getId()==id){
            for (int j = i; j <stus.length-1 ; j++) {
                if (stus[j]!=null){
                    stus[j]=stus[j+1];
                }
            }
            count--;
        }
    }

}
public static void main(String[] args) {
    //添加数据
    StudentManager sm=new StudentManager();
    Student s1=new Student("01","tom",20);
    sm.add(s1);
    Student s2=new Student("02","lili",19);
    sm.add(s2);
    //Student s3=new Student("02","lucy",19);修改数据
    //sm.udp("02",s3);
    // sm.del("02");删除数据
    //sm.findByid("02");查找一个数据
    sm.findAll();//查询所有
}
}

添加数据的效果图
需要实现那个功能就调用哪个方法。

本文地址：https://blog.csdn.net/LN18303855296/article/details/107354676