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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