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任何人都可以幫助我發現錯誤嗎？我試圖通過序列化從文件people.txt（包括200行如'Christel; MacKay; 4「2'; 38'）中的某些信息（最小/最大/平均年齡）傳遞到另一個文件 第一類，在這裏我處理這些人的一些信息：在java中正確序列化對象
import java.io.Serializable;
@SuppressWarnings("serial")
public class Person implements Serializable
{
private String firstname;
private String lastname;
private int age;
public Person (String PersonFN, String PersonLN, int PersonA)
{
firstname = PersonFN;
lastname = PersonLN;
age = PersonA;
}
public String toString()
{
return "Name: "+firstname+" "+lastname+" Age: "+age;
}
public int getAge()
{
return age;
}
}
而另外一個，它完成所有的工作：
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.*;
public class Collection
{
int min;
int max;
int total;
private static ArrayList<Person> people;
public Collection()
{
people = new ArrayList<Person>();
min = 100;
max = 1;
total = 0;
}
BufferedReader fr = null;
BufferedWriter fw = null;
public void readFromFile() throws IOException
{
fr = new BufferedReader (new FileReader("people.txt"));
String line = null;
StringTokenizer st;
while (fr.ready())
{
line = fr.readLine();
st = new StringTokenizer(line);
String name = st.nextToken(";");
String surname = st.nextToken(";").toUpperCase();
String height = st.nextToken(";");
int age = Integer.parseInt(st.nextToken(";").trim());
Person p = new Person (name, surname, age);
p.toString();
people.add(p);
//for the 2nd part
if(age < min)
min = age;
if (age > max)
max = age;
total = total + age;
}
}
public int minAge()
{
int minA = 100;
for (int i = 0; i < people.size(); i++)
{
Person p = people.get(i);
int age = p.getAge();
if (age < minA)
{
minA = age;
}
}
System.out.print(minA+"; ");
return minA;
}
public int maxAge()
{
int maxA = 1;
for (int i = 0; i < people.size(); i++)
{
Person p = people.get(i);
int age = p.getAge();
if (age > maxA)
{
maxA = age;
}
}
System.out.print(maxA+"; ");
return maxA;
}
public float avgAge()
{
int sum = 0;
for (int i = 0; i < people.size(); i++)
{
Person p = people.get(i);
int age = p.getAge();
sum = sum + age;
}
float avgA = sum/people.size();
System.out.print(avgA);
return avgA;
}
public int fastMinAge()
{
//System.out.print("Minimum age: " + min);
return min;
}
public int fastMaxAge()
{
return max;
}
public float fastAvgAge()
{
return total/people.size();
}
public void writeToFile(String filename) throws IOException
{
StringBuffer val = new StringBuffer ("Minimum age: ");
val.append(fastMinAge());
val.append("\n Maximum age: ");
val.append(fastMaxAge());
val.append("\n Average age: ");
val.append(fastAvgAge());
BufferedWriter out = new BufferedWriter(new FileWriter(filename));
String outText = val.toString();
out.write(outText);
out.close();
}
public static void main(String[] args) throws IOException, ClassNotFoundException
{
Collection c = new Collection();
c.readFromFile();
for(Person d: people)
{
System.out.println(d);
}
c.minAge();
c.maxAge();
c.avgAge();
c.fastMinAge();
c.fastMaxAge();
c.fastAvgAge();
c.writeToFile("RESULTS.txt");
String filename = "people.txt";
//FileOutputStream fos = new FileOutputStream(filename);
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(filename));
os.writeObject(c);
os.close();
String filename1 = "results1.txt";
FileInputStream fis = new FileInputStream(filename1);
ObjectInputStream ois = new ObjectInputStream(fis);
Collection p = (Collection) ois.readObject();
ois.close();
}
}
當我運行的代碼，它會創建RESULTS.TXT文件並在那裏添加了正確的信息，我確定這段代碼有一些問題：
String filename = "people.txt";
//FileOutputStream fos = new FileOutputStream(filename);
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(filename));
os.writeObject(c);
os.close();
String filename1 = "results1.txt";
FileInputStream fis = new FileInputStream(filename1);
ObjectInputStream ois = new ObjectInputStream(fis);
Collection p = (Collection) ois.readObject();
ois.close();
順便說一下，我的people.txt文件變成了「¬ķ{sr java.io.NotSerializableException（Vxē†5 xrjava.io.ObjectStreamExceptiondĆäk¨9ūxr java.io.IOExceptionl sde％š« xrjava.lang.ExceptionŠż>; xrjava.lang.ThrowableÕĘ5'9wøĖL causet Ljava/lang/Throwable; L detailMessaget Ljava/lang/String; [ stackTracet [Ljava/lang/StackTraceElement; L suppressedExceptionst Ljava/util /名單; XPQ〜牛逼SD3lab1.Collectionur [Ljava.lang.StackTraceElement; F * < < Z「9 XP SR java.lang.StackTraceElementa埃& 6Z ......我 lineNumberL declaringClassq〜1 fileNameq〜1 methodNameq〜XP t java.io.ObjectOutputStreampt writeObject0sq〜 ˙ Q〜PT writeObjectsq〜 ©Q〜 噸Collection.javat mainsr & java.util.Collections中$UnmodifiableListü％1微克大號listq〜XR，java.util.Collections中$ UnmodifiableCollectionB€E 1÷大號克拉Ljava/util的/收集; xPSR寄存器java.util.ArrayListxŅ™EA我sizexp w^XQ〜X」，而我得到的控制檯上這些錯誤：任何幫助
Exception in thread "main" java.io.NotSerializableException: SD3lab1.Collection
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at SD3lab1.Collection.main(Collection.java:169)
千恩萬謝
'Collection c = new Collection（）;'???你爲什麼要實施收藏？這是一個界面，你有很多可以使用的實現！ – alfasin
@OleksiyMartynov，c來自「Collection c = new Collection（）;」，我之前使用過，我絕對不確定如何做序列化的事情。它是否在正確的課堂上？ – user2962334