ArrayList problem ....i can remove my object from my arrayList

Question

hi all, i am going to remove a object from my array by using arrayList.However, it can`t work properly and did nth for me..i don`t know why...could anyone give me some suggestion and show me what i did wrong on my code ....i stated more detail next to my code...plesae help...
public class MusicCd
     private String musicCdsTitle;
        private int yearOfRelease;
     public MusicCd()
          musicCdsTitle = "";
          yearOfRelease = 1900;
     public MusicCd(String newMusicCdsTitle)
          musicCdsTitle = newMusicCdsTitle;
          //yearOfRelease = newYearOfRelease;
     public MusicCd(String newMusicCdsTitle, int newYearOfRelease)
          musicCdsTitle = newMusicCdsTitle;
          yearOfRelease = newYearOfRelease;
     public String getTitle()
          return musicCdsTitle;
     public int getYearOfRelease()
          return yearOfRelease;
     public void setTitle(String newMusicCdsTitle)
          musicCdsTitle = newMusicCdsTitle;
     public void setYearOfRelease(int newYearOfRelease)
          yearOfRelease = newYearOfRelease;
     public boolean equalsName(MusicCd otherCd)
          if(otherCd == null)
               return false;
          else
               return (musicCdsTitle.equals(otherCd.musicCdsTitle));
     public String toString()
          return("Music Cd`s Title: " + musicCdsTitle + "\t"
                 + "Year of release: " + yearOfRelease + "\t");
import java.util.ArrayList;
import java.io.*;
public class MusicCdStore
   ArrayList<MusicCd> MusicCdList;
   public void insertCd()
        MusicCdList = new ArrayList<MusicCd>( ); 
        readOperation theRo = new readOperation();
        MusicCd theCd;
        int muiseCdsYearOfRelease;
        String muiseCdsTitle;
          while(true)
                String continueInsertCd = "Y";
               do
                    muiseCdsTitle = theRo.readString("Please enter your CD`s title : ");
                    muiseCdsYearOfRelease = theRo.readInt("Please enter your CD`s year of release : ");
                    MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsYearOfRelease));
                    MusicCdList.trimToSize();
                    continueInsertCd = theRo.readString("Do you have another Cd ? (Y/N) : ");
               }while(continueInsertCd.equals("Y") || continueInsertCd.equals("y") );
               if(continueInsertCd.equals("N") || continueInsertCd.equals("n"));
                                                //MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsYearOfRelease));                              
                              break;
                  //System.out.println("You `ve an invalid input " + continueInsertCd + " Please enter (Y/N) only!!");
   public void displayAllCd()
                System.out.println("\nOur CD collection is: \n" );
          System.out.println(toString());
   public String toString( )
        String result= " ";
        for( MusicCd tempCd : MusicCdList)
             result += tempCd.toString() + "\n";
        return result;
   public void searchingMusicCd()
        readOperation theRo = new readOperation();
        String keyword = theRo.readString("Enter a CD `s Title you are going to search : ") ;
        ArrayList<MusicCd> results = searchForTitle(keyword );
          System.out.println("The search results for " + keyword + " are:" );
          for(MusicCd tempCd : results)
               System.out.println( tempCd.toString() );
   //encapsulate the A
   public void removeCd()
        readOperation theRo = new readOperation();
        String keyword = theRo.readString("Please enter CD `s title you are going to remove : ") ;
        ArrayList<MusicCd> removeMusicCdResult = new ArrayList<MusicCd>();
              System.out.println("The CD that you just removed  is " + keyword );
          for(MusicCd tempCd : removeMusicCdResult)
               System.out.println( tempCd.toString() );
   //problem occurs here : i am so confused of how to remove the exactly stuff from my arrayList
   //pls help
   private ArrayList<MusicCd> removeCdForTitle(String removeCdsTitle)
         MusicCd tempMusicCd = new MusicCd();
         tempMusicCd.setTitle(removeCdsTitle);
        // tempMusicCd.setTitle(removeCdsTitle);
        //tempMusicCd.getTitle() = removeCdsTitle;
        ArrayList<MusicCd> removeMusicCdResult = new ArrayList<MusicCd>();
        for(MusicCd currentMusicCd : MusicCdList)
             if((currentMusicCd.getTitle()).equals(tempMusicCd.getTitle()))
                 // removeMusicCdResult.remove(currentMusicCd);
                     MusicCdList.remove(currentMusicCd);
        removeMusicCdResult.trimToSize();
        return removeMusicCdResult;
   private ArrayList<MusicCd> searchForTitle(String searchString)
        ArrayList<MusicCd> searchResult = new ArrayList<MusicCd>();
        for(MusicCd currentMusicCd : MusicCdList)
             if((currentMusicCd.getTitle()).indexOf(searchString) != -1)
                  searchResult.add(currentMusicCd);
        searchResult.trimToSize();
        return searchResult;
import java.util.*;
public class MusicCdStoreEngine{
     public static void main(String[] args)
          MusicCdStore mcs = new MusicCdStore( );
          mcs.insertCd();
          //display the Cd that you just insert
          mcs.displayAllCd();
          mcs.removeCd();
          mcs.displayAllCd();
          mcs.searchingMusicCd();
//Acutally result
//Please enter your CD`s title : ivan
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : y
//Please enter your CD`s title : hero
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : n
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992     
//Please enter CD `s title you are going to remove : hero
//The CD that you just removed  is hero
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992     
//Enter a CD `s Title you are going to search : hero
//The search results for hero are:
//Music Cd`s Title: hero     Year of release: 1992
//>Exit code: 0
//Expected result
//Please enter your CD`s title : ivan
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : y
//Please enter your CD`s title : hero
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : n
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992     
//Please enter CD `s title you are going to remove : hero
//The CD that you just removed  is hero
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992<<-- it is not supposed to display cos i have deleted it from from array     
//Enter a CD `s Title you are going to search : hero
//The search results for hero are:
//Music Cd`s Title: hero     Year of release: 1992<<-- i should have get this reuslt...cos it is already delete from my array
//>Exit code: 0
import java.util.*;
public class readOperation{
     public String readString(String userInstruction)
          String aString = null;
          try
                     Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               aString = scan.nextLine();
          catch (NoSuchElementException e)
               //if no line was found
               System.out.println("\nNoSuchElementException error occurred (no line was found) " + e);
          catch (IllegalStateException e)
               // if this scanner is closed
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aString;
     public char readTheFirstChar(String userInstruction)
          char aChar = ' ';
          String strSelection = null;
          try
               //char charSelection;
                     Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               strSelection = scan.next();
               aChar =  strSelection.charAt(0);
          catch (NoSuchElementException e)
               //if no line was found
               System.out.println("\nNoSuchElementException error occurred (no line was found) " + e);
          catch (IllegalStateException e)
               // if this scanner is closed
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aChar;
     public int readInt(String userInstruction) {
          int aInt = 0;
          try {
               Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               aInt = scan.nextInt();
          } catch (InputMismatchException e) {
               System.out.println("\nInputMismatchException error occurred (the next token does not match the Integer regular expression, or is out of range) " + e);
          } catch (NoSuchElementException e) {
               System.out.println("\nNoSuchElementException error occurred (input is exhausted)" + e);
          } catch (IllegalStateException e) {
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aInt;
}

Answer 1

//problem occurs hereI'm not sure that the problem does occur within the
removeCdForTitle() method.
Your main() method calls removeCd() which obtains the title of
the CD to be removed (keyword). But remoceCd() never
calls removeCdForTitle(), so nothing is ever removed.