FileDocCategorySizeDatePackage
Person.javaAPI DocExample2503Mon May 24 17:06:24 BST 1999None

Person

public class Person extends Object implements Serializable, ObjectInputValidation

(Omit source code)

Fields Summary
static Hashtable
thePeople
String
name
String
ss
Constructors Summary
public Person(String name, String ss)


       
  
    this.name = name;
    this.ss = ss;
    thePeople.put(ss, name);
Methods Summary
public static voidmain(java.lang.String[] args)

  
    Person p1 = new Person("Rusty", "123-45-5678");
    Person p2 = new Person("Beth",  "321-45-5678");
    Person p3 = new Person("David", "453-45-5678");
    Person p4 = new Person("David", "453-45-5678");
  
    Enumeration en = thePeople.elements();
    while (en.hasMoreElements()) {
      System.out.println(en.nextElement());
    }
    
    ByteArrayOutputStream bout = new ByteArrayOutputStream();
    ObjectOutputStream oout = new ObjectOutputStream(bout);
    oout.writeObject(p1);
    oout.writeObject(p2);
    oout.writeObject(p3);
    oout.writeObject(p4);
    oout.flush();
    oout.close();
    
    ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
    ObjectInputStream oin = new ObjectInputStream(bin);
    try {
      System.out.println(oin.readObject());
      System.out.println(oin.readObject());
      System.out.println(oin.readObject());
      System.out.println(oin.readObject());
    }
    catch (InvalidObjectException e) {
      System.err.println(e);
    }
    oin.close();

    // now empty the hashtable and try again
    thePeople.clear();
    bin = new ByteArrayInputStream(bout.toByteArray());
    oin = new ObjectInputStream(bin);
    try {
      System.out.println(oin.readObject());
      System.out.println(oin.readObject());
      System.out.println(oin.readObject());
      System.out.println(oin.readObject());
    }
    catch (InvalidObjectException e) {
      System.err.println(e);
    }
    oin.close();
    
    en = thePeople.elements();
    while (en.hasMoreElements()) {
      System.out.println(en.nextElement());
    }
private voidreadObject(java.io.ObjectInputStream in)


    in.registerValidation(this, 5);
    in.defaultReadObject();
public java.lang.StringtoString()

    return this.name + "\t" + this.ss;
public voidvalidateObject()


    if (thePeople.containsKey(this.ss)) {
      throw new InvalidObjectException(this.name + " already exists");
    }
    else {
      thePeople.put(this.ss, this.name);
    }