package Chapter_9;

import java.io.*;

//此類專門用于保存和讀取對象
public class FileOperate {
 private File file = null;//定義一個文件對象
 public FileOperate(String pathName){//通過構造方法傳遞文件路徑
 this.file = new File(pathName);//實例化File對象
 }
 public boolean save(Object obj) throws Exception{//可以保存對象
 ObjectOutputStream oos = null;//對象輸出流
 boolean flag = false;//定義操作標志位
 try{
  oos = new ObjectOutputStream(new FileOutputStream(this.file));//實例化對象輸出流
  oos.writeObject(obj);//保存對象
  flag = true;
 }catch (Exception e){
  throw e;//有異常拋出
 }finally {
  if (oos != null){//判斷對象輸出流對象是否被實例化
  oos.close();//不管是否有異常都要關閉
  }
 }
 return flag;
 }
 public Object load()throws Exception{//讀取對象
 Object obj = null;//接收保存的對象
 ObjectInputStream ois = null;//聲明對象輸入流
 try{
  ois = new ObjectInputStream(new FileInputStream(this.file));//實例化對象輸入流
  obj = ois.readObject();//讀取對象
 }catch (Exception e){
  throw e;
 }finally {
  if (ois !=null){//判斷輸入流是否被實例化
  ois.close();//關閉輸入流
  }
 }
 return obj;
 }

}

import java.io.*;

public class Person implements Serializable {//此類的對象可以被序列化
 private String name;
 private int age;
 public Person(String name,int age){//通過構造方法設置屬性內(nèi)容
 this.name = name;
 this.age = age;
 }
 public String toString(){
 return "姓名：" + this.name + "; 年齡：" + this.age;
 }

 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;
 }
}

package Chapter_9;

public class Operate {
 public static void add(){//增加數(shù)據(jù)操作
 InputData input = new InputData();//實例化輸入數(shù)據(jù)對象
 FileOperate fo = new FileOperate("D://test.txt");
 String name = input.getString("請輸入姓名：");
 int age = input.getInt("請輸入年齡：","年齡必須是數(shù)字！");
 Person per = new Person(name,age);//實例化 Person 對象
 try {
  fo.save(per);//保存對象
 }catch (Exception e){
  e.printStackTrace();
 }
 System.out.println("信息增加成功");
 }
 public static void delete(){//刪除數(shù)據(jù)操作
 FileOperate fo = new FileOperate("D://test.txt");
 try{
  fo.save(null);//清除對象
 }catch (Exception e){
  e.printStackTrace();
 }
 System.out.println("信息刪除成功！");
 }
 public static void update(){//修改數(shù)據(jù)操作
 InputData input = new InputData();//實例化輸入數(shù)據(jù)對象
 FileOperate fo = new FileOperate("D:\\test.txt");
 Person per = null;
 try{
  per = (Person)fo.load();//讀取數(shù)據(jù)
 }catch (Exception e1){
  e1.printStackTrace();
 }
 String name = input.getString("請輸入新的姓名（原姓名：" + per.getName() + "):");
 int age = input.getInt("請輸入是新的年齡（原年齡：" +
  per.getAge() + ")","年齡必須是數(shù)字！");
 per = new Person(name,age);//重新實例化對象
 try{
  fo.save(per);//重新保存對象
 }catch (Exception e){
  e.printStackTrace();
 }
 System.out.println("信息更新成功");
 }
 public static void find(){
 FileOperate fo = new FileOperate("D:\\test.txt");
 Person per = null;
 try{
  per = (Person)fo.load();//讀取對象
 }catch (Exception e1){
  e1.printStackTrace();
 }
 System.out.println(per);
 }
}