1 封装用户对象
public class User { private String userName; private String userPsw; private String userTel; public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getUserPsw() { return userPsw; } public void setUserPsw(String userPsw) { this.userPsw = userPsw; } public String getUserTel() { return userTel; } public void setUserTel(String userTel) { this.userTel = userTel; } public User(String userName, String userPsw, String userTel) { super(); this.userName = userName; this.userPsw = userPsw; this.userTel = userTel; } public void show(){ System.out.println(this.userName+"\t"+this.userPsw+"\t"+this.userTel); } }2 用户数据
public class userData { public static User[] users = { new User("1", "1", "3"), new User("2", "2", "3") }; /* * 注册用户（往数组中添加数据） */ public void addUser(User user) { User[] newArray = new User[users.length + 1]; for (int i = 0; i < users.length; i++) { newArray[i] = users[i]; } newArray[newArray.length - 1] = user; users = newArray; } /* * 用户登录 (查询) */ public boolean login(String uname,String upass){ boolean flag=false; for(int i=0;i<users.length;i++){ if(users[i].getUserName().equals(uname)&& users[i].getUserPsw().equals(upass)){ flag=true; break; } } return flag; } public void show(){ System.out.println("编号\t用户名\t密码"); for(int i=0;i<users.length;i++){ users[i].show(); } } }3 封装学生
public class Student { private String id; private String name; private int age; private String sex; private String address; private String telePhone; private int mark; public Student() { } public Student(String id, String name, int age, String sex, String address, String telePhone, int mark) { this.id = id; this.name = name; this.age = age; this.sex = sex; this.address = address; this.telePhone = telePhone; this.mark = mark; } 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; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getTelePhone() { return telePhone; } public void setTelePhone(String telePhone) { this.telePhone = telePhone; } public int getMark() { return mark; } public void setMark(int mark) { this.mark = mark; } @Override public String toString() { return "Student [id=" + id + ", name=" + name + ", age=" + age + ", sex=" + sex + ", address=" + address + ", telePhone=" + telePhone + ", mark=" + mark + "]"; } public void show() { // TODO Auto-generated method stub System.out.println(this.id + "\t" + this.name + "\t" + this.age + "\t" + this.sex + "\t" + this.address + "\t" + this.telePhone + "\t" + this.mark); } }4学生数据
public class StudentData { //学生数组对象 public static Student[] stus = { new Student("a1", "laowang", 10, "nan", "shanxi", "15019262511", 92), new Student("a2", "lali", 10, "nan", "shanxi", "15019262511", 92), new Student("a3", "laosun", 10, "nan", "shanxi", "15019262511", 92) }; /** * 添加学生 */ public void addstu(Student stu) { Student[] newStu = new Student[stus.length+1]; for (int i = 0; i < stus.length; i++) { newStu[i] = stus[i]; } newStu[newStu.length - 1] = stu; stus = newStu; } /** * 查询所有信息 */ public void queryAllStudent() { System.out.println("显示所有学生信息"); System.out.println("学好\t姓名\t年龄\t性别\t地址\t电话\t成绩"); for (int i = 0; i < stus.length; i++) { stus[i].show(); } } /** * 按照姓名查询单条数据 */ public void queryName(String name) { int index = -1; for (int i = 0; i < stus.length; i++) { if (stus[i].getName().equals(name)) { index = i; break; } } if (index == -1) { System.out.println("你输入的姓名不存在"); } else { System.out.println("查询成功"); stus[index].show(); } } /** * 根据姓名修改用户成绩 */ public void updateMark(String name, int newMark) { int index = -1; for (int i = 0; i < stus.length; i++) { if (stus[i].getName().equals(name)) { index = i; break; } } if (index == -1) { System.out.println("你输入的姓名不存在，请重新输入"); } else { stus[index].setMark(newMark); System.out.println("修改成功"); ; } } /** * 根据姓名修改用户年龄和地址 */ public void update(String name, int newAge, String newAddress) { int index = -1; for (int i = 0; i < stus.length; i++) { if (stus[i].getName().equals(name)) { index = i; break; } } if (index == -1) { System.out.println("你输入的姓名不存在,请重新输入"); } else { stus[index].setAge(newAge); stus[index].setAddress(newAddress); } } /** * 删除单条数据 */ public void delete(String name) { int index = -1; if (stus.length > 0) { Student[] newStudent = new Student[stus.length - 1]; for (int i = 0; i < stus.length; i++) { if (stus[i].getName().equals(name)) { index = i; break; } } int count = 0; if (index == -1) { System.out.println("你删除的数据不存在"); } else { for (int i = 0; i < stus.length; i++) { if (i != index) { newStudent[count] = stus[i]; count++; } } stus = newStudent; System.out.println("删除成功"); } } } }5界面
public class MainView { Scanner sc = new Scanner(System.in); StudentData st = new StudentData(); userData uds = new userData(); /** * 初始化界面 */ public void init() { while (true) { System.out.println("************************"); System.out.println("| 1.用户登录 ]"); System.out.println("| 2.用户注册 |"); System.out.println("| 3.退出系统 |"); System.out.println("| @@请你选择 |"); System.out.println("************************"); String selNum = sc.next(); if ("1".equals(selNum)) { // 调用登录界面 loginView(); } else if ("2".equals(selNum)) { // 调用注册界面 registerView(); } else if ("3".equals(selNum)) { System.out.println("成功退出系统!!!"); break; } else { System.out.println("您输入的数据格式不合格!!!"); } } } /** * 用户注册 */ private void registerView() { // TODO Auto-generated method stub boolean a = true; while (a) { System.out.println("请输入用户名\t密码\t电话"); System.out.println("请输入用户名"); String userName = sc.next(); System.out.println("请输入密码"); String userPsw = sc.next(); System.out.println("请输入电话"); String userTel = sc.next(); User ud = new User(userName, userPsw, userTel); uds.addUser(ud); System.out.println("用户注册成功"); while (true) { System.out.println("是否返回上一个界面\ty返回上一个界面\tn继续注册用户\t按任意键继续"); String yes = sc.next(); if ("n".equals(yes)) { System.out.println("请继续注册"); break; // a=true; } else if ("y".equals(yes)) { a = false; break; } else { System.out.println("你输入有误"); } } } } /** * 用户登陆 */ private void loginView() { // TODO Auto-generated method stub int loginNum = 0; while (true) { System.out.println("请输入用户名\t密码"); System.out.println("请输入用户名"); String userName = sc.next(); System.out.println("请输入密码"); String userPsw = sc.next(); // System.out.println("请输入"); if (uds.login(userName, userPsw)) { loginNum++; System.out.println("这是你第" + loginNum + "次登录"); successful(); } else { System.out.println("登陆失败,是否重新登陆"); System.out.print("是否继续y/n:"); String ok = sc.next(); if ("n".equals(ok)) { break; } } } } /** * 返回上一个界面 */ public void myReturn() { System.out.println("按任意键继续"); String yes = sc.next(); if ("y".equals(yes)) { return; } } /** * 学生登录界面 */ private void successful() { // TODO Auto-generated method stub while (true) { System.out.println("************************"); System.out.println("| 1.显示所有学生 ]"); System.out.println("| 2.修改学生信息 |"); System.out.println("| 3.添加学生信息 |"); System.out.println("| 4.删除学生信息 |"); System.out.println("| 5.查询学生信息 |"); System.out.println("| 0.退出到上界面 |"); System.out.println("| 请 你 选 择 |"); System.out.println("************************"); String selNum = sc.next(); if ("1".equals(selNum)) { // 显示所有学生信息 st.queryAllStudent(); // 是否返回上一页 myReturn(); } else if ("2".equals(selNum)) { // 修改学生信息界面 updateStudentView(); } else if ("3".equals(selNum)) { // 添加学生信息 addStudentImg(); myReturn(); } else if ("4".equals(selNum)) { // 删除学生信息 deleteStudent(); } else if ("0".equals(selNum)) { break; //init(); } else if ("5".equals(selNum)) { queryStudentView(); } } } /** * 查询数据界面 */ private void queryStudentView() { // TODO Auto-generated method stub while (true) { System.out.println("| 1.查询所有学生成绩 ]"); System.out.println("| 2.查询某个学生成绩 |"); System.out.println("| 0.返回上一界面 |"); String selNum = sc.next(); if ("1".equals(selNum)) { st.queryAllStudent(); // 是否继续查询 System.out.println("是否继续删除\t按任意键继续\tn停止修改"); String yes = sc.next(); if ("n".equals(yes)) { break; } } else if ("2".equals(selNum)) { queryOneSutdent(); } else if ("0".equals(selNum)) { break; } } } /** * 5.2查询某一个学生成绩 */ private void queryOneSutdent() { // TODO Auto-generated method stub while (true) { System.out.println("请输入要查询学生的姓名"); String name = sc.next(); st.queryName(name); // 是否继续查询 System.out.println("是否继续删除\t按任意键继续\tn停止修改"); String yes = sc.next(); if ("n".equals(yes)) { break; } } } /** * 4删除学生信息 */ private void deleteStudent() { // TODO Auto-generated method stub while (true) { System.out.println("请输入要删除学生名称"); String name = sc.next(); st.delete(name); // 显示删除后的数据 System.out.println("显示删除后的所有数据"); st.queryAllStudent(); // 是否继续修改 System.out.println("是否继续修改学生年龄和地址\t按任意键继续\tn停止修改"); String yes = sc.next(); if ("n".equals(yes)) { break; } } } /** * 2.修改学生信息界面 */ private void updateStudentView() { while (true) { System.out.println("| 1.修改学生成绩 ]"); System.out.println("| 2.修改年龄和地址 |"); System.out.println("| 0.返回上一界面 |"); String selNum = sc.next(); if ("1".equals(selNum)) { updateStudentMark(); } else if ("2".equals(selNum)) { updateStudent(); } else if ("0".equals(selNum)) { break; } } } /** * 2.2修改学生年龄和地址 */ private void updateStudent() { // TODO Auto-generated method stub while (true) { System.out.print("请输入要修改学生的姓名"); String name = sc.next(); System.out.println("请输入年龄"); int age = sc.nextInt(); System.out.println("请输入地址"); String address = sc.next(); st.update(name, age, address); System.out.println("显示所有信息"); st.queryAllStudent(); // 是否继续修改 System.out.println("是否继续修改学生年龄和地址\t按任意键继续\tn停止修改"); String yes = sc.next(); if ("n".equals(yes)) { break; } } } /** * 2.1修改学生成绩 */ private void updateStudentMark() { // TODO Auto-generated method stub while (true) { System.out.println("请输入学生名称"); String name = sc.next(); System.out.println("请输入学生成绩"); int mark = sc.nextInt(); st.updateMark(name, mark); // 显示所有数据 st.queryAllStudent(); // 是否继续修改 System.out.println("是否继续修改学生分数\t按任意键继续\tn停止修改"); String yes = sc.next(); if ("n".equals(yes)) { break; } } } /** * 3添加学生信息 */ private void addStudentImg() { // TODO Auto-generated method stub // 添加学生信息 while (true) { System.out.println("学号\t姓名\t年龄\t性别\t地址\t电话\t成绩"); System.out.println(""); String id = sc.next(); String name = sc.next(); int age = sc.nextInt(); String sex = sc.next(); String address = sc.next(); String tel = sc.next(); int mark = sc.nextInt(); Student student = new Student(id, name, age, sex, address, tel, mark); System.out.println("添加成功，显示所有学生数据"); st.addstu(student); st.queryAllStudent(); System.out.println("是否继续添加\t任意键继续添加\tn停止添加"); String yes = sc.next(); if ("n".equals(yes)) { break; } } } }6测试
public class Test { public static void main(String[] args) { // TODO Auto-generated method stub MainView mv = new MainView(); mv.init(); } } 注册 登录
