JAVA学习笔记13：IO&类集

import java.io.*;
public class Student implements Serializable
{
private String name;
private int age;
public Student(String name,int age){
this.setName(name);
this.setAge(age);
}
public void setName(String name){
this.name = name;
}
public void setAge(int age){
this.age = age;
}
public String getName(){
return this.name;
}
public int getAge(){
return this.age;
}
public String toString(){
return "姓名：" + this.getName() + "；年龄：" + this.getAge();
}
public boolean equals(Object obj){
if (this==obj)
{
return true;
}
if (!(obj instanceof Student))
{
return false;
}
Student stu = (Student)obj;
if (this.getName().equals(stu.getName())&&this.getAge()==stu.getAge())
{
return true;
}else{
return false;
}
}
public int hashCode(){
return this.getName().hashCode()*this.getAge();
}
};

import java.io.*;
public class FileOperate
{
private File f;
public FileOperate(String path){
this.f = new File(path);
}
public boolean store(Object obj) throws Exception{
ObjectOutputStream oos = null;
boolean flag = false;
try{
oos = new ObjectOutputStream(new FileOutputStream(this.f));
oos.writeObject(obj);
flag = true;
}catch(Exception e){
throw e;
}finally{
if (oos!=null)
{
oos.close();
}
}
return flag;
}
public Object load() throws Exception{
ObjectInputStream ois = null;
Object obj = null;
try{
if (!this.f.exists())
{
this.store(null);
}
ois = new ObjectInputStream(new FileInputStream(this.f));
obj = ois.readObject();
}catch(Exception e){
throw e;
}finally{
if (ois!=null)
{
ois.close();
}
}
return obj;
}
};

import java.io.*;
public class InputData
{
private static BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
public static String getString(String info){
String temp = null;
System.out.print(info);
try{
temp = InputData.buf.readLine();
}catch(IOException e){
e.printStackTrace();
}
return temp;
}
public static int getInt(String info,String err){
int temp = 0;
boolean flag = true;
String str = null;
while (flag)
{
str = InputData.getString(info);
if (str.matches("^\\d+$"))
{
temp = Integer.parseInt(str);
flag = false;
}else{
System.out.println(err);
}
}
return temp;
}
public static float getFloat(String info,String err){
float temp = 0.0f;
boolean flag = true;
String str = null;
while (flag)
{
str = InputData.getString(info);
if (str.matches("^\\d+\\.\\d+$")||str.matches("^\\d+$"))
{
temp = Float.parseFloat(str);
flag = false;
}else{
System.out.println(err);
}
}
return temp;
}
};

import java.util.*;
public class StuOperate
{
private FileOperate fo;
private Map<String,Student> allStudent;
@SuppressWarnings("unchecked")
public StuOperate(String path){
this.fo = new FileOperate(path);
try{
this.allStudent = (Map<String,Student>)this.fo.load();
}catch(Exception e){
e.printStackTrace();
}
if (this.allStudent==null)
{
this.allStudent = new HashMap<String,Student>();
}
}
public void add(){
String number = null;
while (true)
{
number = InputData.getString("请输入学号<全为数字>：");
if (number.matches("^\\d+$"))
{
break;
}else{
System.out.println("学号不正确，请重新输入！");
}
}
if (this.allStudent.containsKey(number))
{
while (true)
{
String str = InputData.getString("系统已包含该学号的学生 ---> " + this.allStudent.get(number) + "，确定要覆盖？<Y/N>：");
if (str.equalsIgnoreCase("n"))
{
return;
}else if(str.equalsIgnoreCase("y")){
break;
}else{
System.out.println("输入不正确！");
}
}
}
String name = InputData.getString("请输入姓名：");
int age = InputData.getInt("请输入年龄：","年龄必须为整数，请重新输入！");
this.allStudent.put(number,new Student(name,age));
try{
this.fo.store(this.allStudent);
}catch(Exception e){
e.printStackTrace();
}
System.out.println("添加成功！");
}
public void remove(){
String number = InputData.getString("请输入要删除的学生的学号：");
if (this.allStudent.containsKey(number))
{
while (true)
{
String str = InputData.getString("确定要删除该学生吗？<Y/N>：");
if (str.equalsIgnoreCase("n"))
{
return;
}else if(str.equalsIgnoreCase("y")){
break;
}else{
System.out.println("输入不正确！");
}
}
this.allStudent.remove(number);
try{
this.fo.store(this.allStudent);
}catch(Exception e){
e.printStackTrace();
}
System.out.println("删除成功！");
}else{
System.out.println("系统不包含指定的学生信息！");
}
}
public void search(){
String number = InputData.getString("请输入要查询的学生的学号：");
if (this.allStudent.containsKey(number))
{
System.out.println("学号：" + number + this.allStudent.get(number));
}else{
System.out.println("系统没有查询到指定学生的信息！");
}
}
public void update(){
String number = InputData.getString("请输入要更新信息的学生学号：");
if (this.allStudent.containsKey(number))
{
String name = InputData.getString("请设置姓名<原姓名:" + this.allStudent.get(number).getName()+">：");
int age = InputData.getInt("请设置年龄<原年龄:" + this.allStudent.get(number).getAge()+">：","年龄必须为整数，请重新输入！");
this.allStudent.put(number,new Student(name,age));
try{
this.fo.store(this.allStudent);
}catch(Exception e){
e.printStackTrace();
}
System.out.println("更新成功！");
}else{
System.out.println("系统不包含指定的学生信息！");
}
}
public void clear(){
while (true)
{
String str = InputData.getString("确定要清空全部学生信息吗？<Y/N>：");
if (str.equalsIgnoreCase("n"))
{
return;
}else if(str.equalsIgnoreCase("y")){
break;
}else{
System.out.println("输入不正确！");
}
}
this.allStudent.clear();
try{
this.fo.store(this.allStudent);
}catch(Exception e){
e.printStackTrace();
}
System.out.println("清空成功！");
}
public void findAll(){
if (!this.allStudent.isEmpty())
{
this.printAll();
}else{
System.out.println("系统没有发现任何学生信息！");
}
}
private void printAll(){
Set<Map.Entry<String,Student>> allSet = this.allStudent.entrySet();
Iterator<Map.Entry<String,Student>> iter = allSet.iterator();
while (iter.hasNext())
{
Map.Entry<String,Student> me = iter.next();
System.out.println("学号：" + me.getKey() + "；" + me.getValue());
}
}
};

public class StuMenu
{
private StuOperate so;
public StuMenu(String path){
this.so = new StuOperate(path);
while (true)
{
this.show();
}
}
public void show(){
System.out.println("***学生管理系统***");
System.out.println("【1】添加学生信息");
System.out.println("【2】删除学生信息");
System.out.println("【3】更新学生信息");
System.out.println("【4】搜索学生信息");
System.out.println("【5】查看全部信息");
System.out.println("【6】清空全部信息");
System.out.println("【0】退出系统\n");
int i = InputData.getInt("请选择：","请输入正确的选项！");
switch (i){
case 1:{
this.so.add();
break;
}
case 2:{
this.so.remove();
break;
}
case 3:{
this.so.update();
break;
}
case 4:{
this.so.search();
break;
}
case 5:{
this.so.findAll();
break;
}
case 6:{
this.so.clear();
break;
}
case 0:{
System.exit(1);
break;
}
default:{
System.out.println("请选择正确的操作！");
break;
}
}
}
};

import java.io.*;
public class StuManage
{
public static void main(String[] args){
new StuMenu("d:" + File.separator + "student.dat");
}
};