类：
public class Stu {
private String name;//学生姓名
private String number;//学号
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
private String phone;//电话
public Stu() {
}
public Stu(String name,String number,String phone) {
// System.out.println(“带参的构造方法正在创建对象”);
this.phone = phone;
this.number = number;
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void show(String userName) {
System.out.println(userName+"正在查看"+this.name);
}
public String toString() {
return "姓名:" + name + ",学号:" + number + ",电话:" + phone;
}
}
主函数：
public class Student {
public static void main(String[] args) {
//扫描器
Scanner in = new Scanner(System.in);
Stu[] student1 = new Stu[2000];
boolean flag = true;
System.out.println("欢迎使用学生管理系统：");
do {
//输入以后名称
System.out.println("请输入用户名：");
String userName = in.next();
//输入密码
System.out.println("请输入密码：");
String password = in.next();
//判断用户名密码是否正确
if ("admin".equals(userName) && "123".equals(password)) {
System.out.println("登录成功");
do {
//选则需要进行的操作
System.out.println("**** 高校学员管理系统 *****");
System.out.println("**** 1、添加学生 *****");
System.out.println("**** 2、删除学生 *****");
System.out.println("**** 3、修改信息 *****");
System.out.println("**** 4、查询学生 *****");
System.out.println("**** 5、打印学生 *****");
System.out.println("**** 6、退出系统 *****");
System.out.println("**** 请选择你需要进行的操作： *****");
int sel = in.nextInt();
switch (sel) {
//添加
case 1:
System.out.println("请输入姓名");
String name = in.next();
System.out.println("请输入学号");
String number = in.next();
System.out.println("请输入电话");
String phone = in.next();
Stu student = new Stu(name, number, phone);
for (int i = 0; i < student1.length; i++) {
if (student1[i] == null) {
student1[i] = student;
break;
}
else if(student1[i].getNumber().equals(number)){
System.out.println("该学号重复，请重新输入");
break;
}
else if (student1[student1.length - 1] != null) {
System.out.println("学生数已满");
break;
}
}
//数组名.fori可以直接创建for循环
for (int i = 0; i < student1.length; i++) {
if (student1[i] != null) {
System.out.println(student1[i]);
}
}
break;
//删除
case 2:
System.out.println("请输入你需要删除的学生姓名");
name = in.next();
//定义一个标记
boolean flag1 = true;
for (int i = 0; i < student1.length; i++) {
if(student1[0]==null){
System.out.println("没有学生");
break;
}
if(student1[i]!=null&&!student1[i].getName().equals(name)){
flag1 = false;
}
if(student1[i]!=null&&student1[i].getName().equals(name)){
student1[i] = null;
System.out.println("删除成功!");
flag1 = true;
break;
}
if (!flag) {
System.out.println("该学生不存在");
}
}
break;
//3修改
case 3:
System.out.println("请输入需要修改的学生名称");
name = in.next();
System.out.println("请输入修改后的姓名");
String n2 = in.next();
System.out.println("请输入修改后学号");
number = in.next();
System.out.println("请输入电话");
phone = in.next();
boolean flag2=true;
for (int i = 0; i < student1.length; i++) {
//判断在数组不为null时books[i].getName() != name那么flag2为false
if (student1[i]!=null&&!student1[i].getName().equals(name) ) {
flag2 = false;
}
if(student1[i]!=null&&student1[i].getNumber().equals(number)){
//System.out.println("该学号已被使用，请核对后重新输入");
flag2 = false;
break;
}
//判断如果找到了需要修改的学生那么对他进行修改并提示
if(student1[i]!=null&&student1[i].getName().equals(name)){
student1[i].setName(n2);
student1[i].setNumber(number);
student1[i].setPhone(phone);
System.out.println("修改完成");
flag2 = true;
break;
}
}
if (!flag2) {
System.out.println("此学生不存在或学号冲突");
}
break;
//查询
case 4:
System.out.println("输入需要查询的学生姓名或学号");
String sname = in.next();
//number=in.next();
boolean flag3 = true;
//增强for 数据类型 变量名 数组或者集合名
for (Stu b : student1) {
if (b != null) {
if (b.getName().equals(sname) || b.getNumber().equals(sname)) {
flag3 = true;
System.out.println(b);
//break;
} else {
flag3 = false;
}
}
}
if(!flag3){
System.out.println("学生不存在");
}
break;
//查询
case 5:
for (int i = student1.length - 1; i >= 0; i--) {
if(student1[i]!=null)
System.out.println(student1[i]);
}
break;
case 6:
System.exit(0);
break;
default:
break;
}
}while (true);
} else {
flag = true;
System.out.println("登录失败请重新输入：");
}
} while (flag);
}
}