package aa;
import java.util.*;
import java.io.*;public class Main {
public static class tt implements Serializable {
int num;
} public static void main(String[] args)
{
try{
FileOutputStream fos=new FileOutputStream("a.txt");
ObjectOutputStream oos=new ObjectOutputStream(fos);
tt []v=new tt[100];
tt vv=new tt();
v[0]=vv;
v[0].num=11;
oos.writeObject(v);
oos.close();
FileInputStream fis=new FileInputStream("a.txt");
ObjectInputStream ois=new ObjectInputStream(fis);
tt v1=(tt)(ois.readObject());
System.out.println(v1.num);
ois.close();
}
catch(IOException e)
{
System.out.println(e);
}
catch(Exception e)
{
System.out.println(e);
}
}
}怎么a.txt出现乱码,程序没有输出?????
import java.util.*;
import java.io.*;public class Main {
public static class tt implements Serializable {
int num;
} public static void main(String[] args)
{
try{
FileOutputStream fos=new FileOutputStream("a.txt");
ObjectOutputStream oos=new ObjectOutputStream(fos);
tt []v=new tt[100];
tt vv=new tt();
v[0]=vv;
v[0].num=11;
oos.writeObject(v);
oos.close();
FileInputStream fis=new FileInputStream("a.txt");
ObjectInputStream ois=new ObjectInputStream(fis);
tt v1=(tt)(ois.readObject());
System.out.println(v1.num);
ois.close();
}
catch(IOException e)
{
System.out.println(e);
}
catch(Exception e)
{
System.out.println(e);
}
}
}怎么a.txt出现乱码,程序没有输出?????
public static class tt implements Serializable {
int num;
} public static void main(String[] args)
---
这里就有问题..你到底要这个类做什么? 类里面还有类.两个文件,放在一个package里面.一个是main,一个是value.----另外不要用什么tt vv aa bb做变量名
{
System.out.println(e);
}
这个异常出现??我觉得 FileInputStream fis=new FileInputStream("a.txt");
ObjectInputStream ois=new ObjectInputStream(fis);
tt v1=(tt)(ois.readObject());
System.out.println(v1.num);
ois.close();
错了,望回复!
别输入的是数组,读出是却要转型成数组元素ClassCastException
btw:乱码是正常的 这属于过程内部编码 只反序列化出来正确就行了
System.out.println(v1[0].num);
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;public class Main {
public static class tt implements Serializable{
public int num; @Override
public String toString() {
// TODO Auto-generated method stub
return num+"";
}
} public static void main(String[] args) {
try {
FileOutputStream fos = new FileOutputStream("a.txt");
ObjectOutputStream oos = new ObjectOutputStream(fos);
tt[] v = new tt[100];
tt vv = new tt();
v[0] = vv;
v[0].num = 11;
oos.writeObject(vv);
oos.close(); FileInputStream fis = new FileInputStream("a.txt");
ObjectInputStream ois = new ObjectInputStream(fis);
tt v1 = (tt) (ois.readObject());
System.out.println(v1.num);
ois.close();
} catch (IOException e) {
System.out.println(e);
} catch (Exception e) {
System.out.println(e);
}
}}
向上面程序可以看见输出~
a.txt是乱码正常~你写的对象!!
错误提示如下:
Exception in thread "main" java.lang.NoClassDefFoundError: w
Caused by: java.lang.ClassNotFoundException: w
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: w. Program will exit.
请按任意键继续. . .
望快点回复!谢谢