用java写学生信息的增删改查（没有数据库知识？！）（学生数据库管理系统）

目的：实现对学生信息的增删改查

一、student 类

• 四个基本信息：学号、姓名、手机号、地址

package venus;

public class Student{
	private String id;
	private String name;
	private String mobile;
	private String address;
	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 getMobile() {
		return mobile;
	}
	public void setMobile(String mobile) {
		this.mobile = mobile;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	
	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", mobile=" + mobile + ", address=" + address + "]";
	}
	
}

二、Main 类

package venus;

import java.util.Scanner;

public class Main {
	static int index =0;
	static Student [] students=new Student[45];
	public static void main(String[] args) {
		System.out.println("***********************************");
		System.out.println("*      欢迎使用学生管理系统         *");
		System.out.println("***********************************");
		for(;;) {
			menu();
		}
	}
	private static void menu() {
		
		System.out.println("1、添加学生信息");
		System.out.println("2、删除学生信息");
		System.out.println("3、修改学生信息");
		System.out.println("4、查询学生信息");
		System.out.println("请输入操作项，点击Enter键");
		Scanner scanner=new Scanner(System.in);
		int option = scanner.nextInt();
		switch (option) {
		case 1:{
			if(index>students.length-1) {
				System.out.println("已经没有座位了");
				break;
			}
			Student student=new Student();
			System.out.println("请输入学号，点击Enter键");
			String id=scanner.next();
			student.setId(id);
			System.out.println("请输入姓名，点击Enter键");
			String name=scanner.next();
			student.setName(name);
			System.out.println("请输入手机号，点击Enter键");
			String mobile=scanner.next();
			student.setMobile(mobile);
			System.out.println("请输入地址，点击Enter键");
			String address=scanner.next();
			student.setAddress(address);
			if(index!=0) {
				for(Student stu:students) {
					if(stu==null) {
						break;
					}
					if(stu.getId().equals(id)){
						System.out.println("学号不能重复");
						return;
					}
				}
			}
			students[index]=student;
			index=index+1;
			System.out.println("添加成功");
			break;
		}
		case 2:{	
			System.out.println("请输入学号，并按Enter键");
			boolean hasData=false;
			String Id=scanner.next();
			int i=0;
			for(;i<students.length;i++) {
				if(students[i]==null) {
					break;
				}
				if(students[i].getId().equals(Id)){
					for(;i<students.length;i++) {
						students[i]=students[i+1];
						students[i+1]=null;
						break;
					}
					System.out.println("删除成功");
					index=index-1;
					hasData=true;
					return;
				}
			}
			if(!hasData) {
				System.out.println("没有找到学号为"+Id+"的同学，请重新输入");
			}
			return;
		}
		case 3:{
			System.out.println("请输入学号，并按Enter");
			boolean hasData=false;
			String Id=scanner.next();
			for(Student student:students) {
				if(student==null) {
					break;
				}
				if(student.getId().equals(Id)){
					System.out.println("请输入姓名，点击Enter键");
					String name=scanner.next();
					student.setName(name);
					System.out.println("请输入手机号，点击Enter键");
					String mobile=scanner.next();
					student.setMobile(mobile);
					System.out.println("请输入地址，点击Enter键");
					String address=scanner.next();
					student.setAddress(address);
					System.out.println("修改成功");
					hasData=true;
					return;
				}
			}
			if(!hasData) {
				System.out.println("没有找到学号为"+Id+"的同学，请重新输入");
			}
			return;
		}	
		case 4:{
			boolean hasData=false;
			System.out.println("请输入姓名,并按Enter");
			String name=scanner.next();
			for(Student stu:students) {
				if(stu==null) {
					break;
				}
				if(stu.getName().equals(name)) {
					System.out.println(stu);
					hasData = true;
				}
			}
			if(!hasData) {
				System.out.println("没有找到姓名为"+name+"的学生");
			}
			return;
		}
		default:
			System.out.println("系统没有找到"+option+"操作项");
			break;	
		}
	}
}