crowd.java

非常好的java事例以及带源码事例的java2教程

import java.util.*;

class Crowd
{
  // Constructors
  public Crowd()
  {
    // Create default Vector object to hold people
    people = new Vector();
  }

  public Crowd(int numPersons)
  {
    // Create Vector object to hold people with given capacity
    people = new Vector(numPersons);
  }

  // Add a person to the crowd
  public boolean add(Person someone)
  {
    return people.add(someone);     // Use the Vector method to add
  }

  // Get the person at a given index
  Person get(int index)
  {  return (Person)people.get(index);  }

  // Get number of persons in crowd
  public int size()
  { return people.size(); }

  // Get people store capacity
  public int capacity()
  { return people.capacity(); }

  // Get an iterator for the crowd
  public Iterator iterator()
  { return people.iterator(); }

  // Person store - only accessible through methods of this class
  private Vector people;    
}