database.java

程序设计模式java入门源码大全

public class Database 
{
  private static Database singleObject;
  private int record;
  private String name;

  private Database(String n)
  {
    name = n;
    record = 0;
  }

  public static Database getInstance(String n)
  {
      if (singleObject == null){
        singleObject = new Database(n);
      }

      return singleObject;
  }

  public void editRecord(String operation)
  {
    System.out.println("Performing a " + operation +
      " operation on record " + record + 
      " in database " + name);
  }

  public String getName()
  {
    return name;
  }
}