Java Reference
In-Depth Information
Now, you'll create a simple example that writes an object to a file and reads the same object
back in. The created object will contain a vector of other objects. Listing 6.1 contains the
object you will be serializing.
6
L
ISTING
6.1
StudentList.java
import java.io.*;
import java.util.*;
public class StudentList implements Serializable {
// Vector holding our students
Vector list = new Vector(6);
// Default Constructor
public StudentList() {
}
public void addStudent(String value) {
// Add a String representing a student name
if ( value != null ) {
list.addElement(value);
}
}
public void listStudents() {
// Iterate over list vector, printint all Strings
for ( int x = 0; x < list.size(); x++ ) {
System.out.println(“Student “ + x + “ : “
+ (String)list.elementAt(x));
}
}
}
Notice that the
StudentList
object implements the
java.io.Serializable
interface. It also
contains a vector of strings representing student names, which are also defined as
Serializable
.
The
StudentListApplication
will be used to create, store, and retrieve the
StudentList
from
persistent storage. In this example, the persistent storage is the file
file.dat
. The
StudentListApplication
is found in Listing 6.2.
