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code throws error "java.io.EOFException"?

 
Minal Silimkar-Urankar
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FileInputStream fis=new FileInputStream("emp.ser");
ObjectInputStream ois=new ObjectInputStream(fis);

System.out.println("De-serializing object...");

Employee e1[]=new Employee[5];
int i=0;
while((e1[i]=(Employee)ois.readObject())!=null){
//e1[i]=(Employee)ois.readObject();
System.out.println(e1[i].getEmpno()+"\t"+e1[i].getSalary());
}
System.out.println("Object de-serialize...");
ois.close();
fis.close();
 
Joe Ess
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ObjectInputStream.readObject does not return null on EOF, as your while loop expects. It throws an EOFException. Have a look at the API documentation for the particulars. I don't like relying on exceptions to signal something that is expected, like EOF so I usually store a bunch of objects in a collection of some sort and serialize that. Other folks will recommend first writing the number of objects to the stream, then writing the objects.
 
It is sorta covered in the JavaRanch Style Guide.
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