0

我试图弄清楚如何将我完美的哈希类中的 4 个基本伪代码方法转换为最终将在我的PerfectHash类的主要方法中使用的可行方法。我知道我还没有创建类的实例，但我会的。

您知道，当您使用堆栈调用 4 个方法时，例如，您在方法中输入参数，但我的应用程序将能够获取用户输入的键并在其中插入、获取、删除或更新的结构。

我是否需要对这些方法进行更多思考，或者伪代码现在是否足以工作？这是我到目前为止所做的。我知道第一堂课编译得很好，但是我在上面已经指出的第二堂课遇到了麻烦。

public class PerfectHash
{

  private StadiumTickets[] data; 


  public boolean insert(StadiumTickets newStadiumTicket)
  {
      // the direct insert hashed algorithm 

       pseudoKey = preProcessing(targetKey); 
       ip = pseudoKey; // direct hashing function 

       // insert the new ticket
        data[ip] = newStadiumTicket.deepCopy(); 
  }

  public StadiumTickets fetch(String targetKey)
  {

    // the fetch algorithm 
    // access the primary storage area 

     pseudoKey = preprocessing(targetKey); 
     ip = pseudoKey; // direct hashing function 

    if(data[ip]== null)
     { 
         return null; 
     } 
     else
     {
        return data[ip].deepCopy(); 
     }
   } 

   public boolean delete(String targetKey)
   { 
      // the delete direct hashed algorithm 

      // access the primary storage area 

         pseudoKey = preprocessing(targetKey);

       ip = pseudoKey; // direct hashing function 

      if(data[ip]== null)
      { 
         return false; 
       } 
      else 
      { 
        data[ip]= null;                      
        return true; 
      }
    } 
    public boolean update(String targetKey, StadiumTickets newStadiumTicket)
    {
        // the update direct hashed algorithm 

       if(delete(targetKey) == false)
           return false; 
       else 
        {
           insert(newStadiumTicket) 
             return true;
         }
     }

}

import java.util.Scanner; 

public class StadiumTickets
{

     int ticketNumber; // keyfield

     String purchaserName; 


  public void input()
  {

     Scanner input= new Scanner(System.in);

      // key values ranges between 2000 to 100,000 


      System.out.print("Please enter a ticket number between 2000 to 100,000: "); 

      // a variable to hold the answer

       ticketNumber= input.nextInt(); 


        // error checking to make sure the user doesn't enter a key outside of the lower or upper ranges

       if(ticketNumber < 2000 && ticketNumber > 100000) 
        System.out.println("This number is not a valid entry to input into the structure.");
     }

  public StadiumTickets(int ticketNumber, String purchaserName)
  {

       this.ticketNumber= ticketNumber; 
       this.purchaserName= purchaserName; 
   } 



   public StadiumTickets deepCopy()
   { 

      StadiumTickets clone= new StadiumTickets(ticketNumber, purchaserName); 
       return clone; 
   }  
}
4

0 回答 0