mvc模式 学生管理系统

/**主界面

*/

public class Client {

public static void main(String[] args) {

System.out.println("--------------------");

System.out.println("欢迎进入学生管理系统");

System.out.println("--------------------");

Control.getInstance().addView(new MainView());

Control.getInstance().showView();

}

}

//model

import java.util.HashSet;

import java.util.Iterator;

import com.czh.entity.Student;

public class StudentManager {

public static HashSet<Student>studentList = new HashSet<Student>();

public static void add(Student student) {

studentList.add(student);

System.out.println("插入成功！");

}

public static void del() {

}

public static void modify() {

}

public static void show(int id) {

boolean isHave = false;

Iterator<Student> iterator = StudentManager.studentList.iterator();

while(iterator.hasNext()){

Student student = iterator.next();

if(student.getId() == id){

System.out.println(student);

isHave = true;

break;

}

}

if(!isHave){

System.out.println("该学号不存在");

}

}

public static void allShow() {

System.out.println(StudentManager.studentList);

}

}

//定义一个接口

public interface View {

public abstract void showView();

}

import java.util.Scanner;

import com.czh.control.Control;

import com.czh.entity.Commond;

import com.czh.model.StudentManager;

import com.czh.util.Util;

public class ShowStudentView implements View {

@Override

public void showView() {

System.out.println("请输入学号，查询学生，输入all查询所有学生,back返回上一级");

while (true) {

Scanner in = new Scanner(System.in);

String value = in.next();

if("all".equals(value)){//查询所有

Commond commond = new Commond(0, value);

Control.getInstance().operateCommond(commond);

}else if("back".equals(value)){

Control.getInstance().bakcView();

Control.getInstance().showView();

return;

}else{//单个查询

Commond commond = new Commond(0, value);

Control.getInstance().operateCommond(commond);

}

}

}

}

import java.util.Scanner;

import com.czh.control.Control;

import com.czh.entity.Commond;

public class MainView implements View {

@Override

public void showView() {

while (true) {

System.out.println("请输入操作：0是查询，1是添加，2是修改，3是删除，back是返回");

Scanner in = new Scanner(System.in);

String name = in.next();

switch(name){

case "0":

Control.getInstance().addView(new ShowStudentView());

Control.getInstance().showView();

return;

case "1":

Control.getInstance().addView(new AddStudentView());

Control.getInstance().showView();

return;

case "2":

break;

case "3":

break;

case "back":

Control.getInstance().bakcView();

Control.getInstance().showView();

return;

default:

System.out.println("您输入的命令错误");

break;

}

}

}

}

import java.util.Scanner;

import com.czh.control.Control;

import com.czh.entity.Commond;

import com.czh.entity.Student;

public class AddStudentView implements View {

@Override

public void showView() {

System.out.println("请输入学生姓名，添加学生,back返回上一级");

while (true) {

Scanner in = new Scanner(System.in);

String name = in.next();

if("back".equals(name)){

Control.getInstance().bakcView();

Control.getInstance().showView();

return;

}else{

Student student = new Student();

student.setName(name);

Commond commond = new Commond(1, student);

Control.getInstance().operateCommond(commond);

}

}

}

}

import java.util.Stack;

import com.czh.entity.Commond;

import com.czh.entity.Student;

import com.czh.model.StudentManager;

import com.czh.util.Util;

import com.czh.view.View;

/**

* 连接 view 和 studentManger 的桥梁，

* 接受view 的命令 ，去操作studentManger，将处理的结果，交给view显示

*/

public class Control {

private static Control control = new Control();

private Stack<View> viewStack ;

private Control(){

viewStack = new Stack<>();

}

public static Control getInstance(){

return control;

}

/**

* 添加界面

* @param view

*/

public void addView(View view){

viewStack.push(view);

}

public void showView(){

if(!viewStack.isEmpty()){

viewStack.get(viewStack.size()-1).showView();

}else{

System.out.println("退出学生管理系统！");

}

}

public void bakcView(){

viewStack.pop();

}

//0是查询，1是添加，2是修改，3是删除

public void operateCommond(Commond commond){

switch(commond.getFlag()){

case 0://查询

String strShow = (String) commond.getObj();

if(strShow.equals("all")){

StudentManager.allShow();

}else{

int id = Util.strToInt(strShow);

StudentManager.show(id);

}

break;

case 1://添加

Student student = (Student)commond.getObj();

student.setId(StudentManager.studentList.size());

StudentManager.add(student);

break;

case 2://修改

break;

case 3://删除

break;

default:

System.out.println("命令错误！");

break;

}

}

}

package com.czh.util;

/**

* 工具类

* @author czh

*

*/

public class Util {

public static int strToInt(String num){

int numInt = 0;

try {

numInt = Integer.valueOf(num);

} catch (Exception e) {

numInt = 0;

}

return numInt;

}

}

public class Commond {

//标记是什么命令：0是查询，1是添加，2是修改，3是删除

private int flag ;

private Object obj;

public Commond(int flag , Object obj){

this.flag = flag;

this.obj = obj;

}

public int getFlag() {

return flag;

}

public void setFlag(int flag) {

this.flag = flag;

}

public Object getObj() {

return obj;

}

public void setObj(Object obj) {

this.obj = obj;

}

}

public class Student {

private String name;

private int id;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

@Override

public boolean equals(Object obj) {

if (obj instanceof Student) {

Student student = (Student) obj;

if ((this.name.equals(student.getName())) && (this.id == student.getId())) {

}

}

return super.equals(obj);

}

@Override

public int hashCode() {

return name.hashCode() + id;

}

@Override

public String toString() {

// TODO Auto-generated method stub

return "学号：" + this.id + " 姓名:" + this.name;

}

}