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// This example demonstrates serialisation of
// sorted associations in Java. The main program
// adds items to an object out of order, serialize the
// object, deserialize it and then add more items
// to it. When they are printed after deserialisation,
// all items will appear in the right order.
class Academy {
1 -- * Student registrants sorted {id};
}
class Student {
Integer id;
name;
}
// Mixin with main program, toString method
// and serialization test
class Academy {
depend java.nio.file.*;
depend java.io.*;
public static void main(String [ ] args) {
String filename = "SortedSerializableAssociation.ser";
Academy ac = new Academy();
Student j = ac.addRegistrant(12,"Jim");
Student a = ac.addRegistrant(4,"Ali");
System.out.println("Before Serialization");
System.out.println(ac);
//serialization
try
{
FileOutputStream file = new FileOutputStream(filename);
ObjectOutputStream out = new ObjectOutputStream(file);
out.writeObject(ac);
out.close();
file.close();
}
catch(Exception ex)
{
System.out.println(ex.getMessage());
}
Academy ac2 = null;
// Deserialization
try
{
FileInputStream file = new FileInputStream(filename);
ObjectInputStream in = new ObjectInputStream(file);
ac2 = (Academy)in.readObject();
in.close();
file.close();
}
catch(Exception ex)
{
System.out.println(ex.getMessage());
}
// Adding new elements and comparing
try
{
Student m = ac2.addRegistrant(8,"Mary");
Student f = ac2.addRegistrant(3,"Francois");
}
catch(Exception ex)
{
System.out.println(ex.getMessage());
}
System.out.println("After Serialization");
System.out.println(ac2);
}
public String toString() {
String result="Students:\n";
for (Student s: getRegistrants()) {
result +=s + "\n";
}
return result;
}
}
class Student {
public String toString() {
String result="Student=" + id + "["
+ name +"]"+ "\n";
return result;
}
}
//$?[End_of_model]$?
// @@@skipcppcompile - Has Java code
// @@@skipphpcompile - Has Java code
// @@@skiprubycompile - Has Java code
// @@@skippythoncompile - Has Java code
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