Removing from objects memory

Hi
How do I load an object to memory and remove it?
I mean if I create an object, like newObject anobject = new newObject();
will it be in the memory? I want to create an object and display it in a panel when a button is clicked and remove it from the memory when another object is loaded into the panel.
Also, in NetBeans IDE, how do I edit the code in the blue area?
Thanks in advance :)

Well, its going to be a wizard like application, and I am creating all the panels required for the wizard in the main frame. All the GUI elements of each step of the wizard will be in a panel. What I want to do is, to remove the initial panel when the next panel is loaded to reduce load on memory.
I'm thinking if I dont, all the panels will be just there even if it is not seen because I'm using setVisible(true) to show the next step of the wizard and setVisible(false) to hide it when the next button is clicked.
Is there any other way to do it? What I would really like to do is create the new instance of the panel when a button is clicked and remove the instance when next button is clicked, but this doesnt seem possible.
Thanks for the help :)

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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;
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        MusicCdList = new ArrayList<MusicCd>( );
        readOperation theRo = new readOperation();
        MusicCd theCd;
        int muiseCdsYearOfRelease;
        String muiseCdsTitle;
          while(true)
                String continueInsertCd = "Y";
               do
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                    muiseCdsYearOfRelease = theRo.readInt("Please enter your CD`s year of release : ");
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               }while(continueInsertCd.equals("Y") || continueInsertCd.equals("y") );
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                                                //MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsYearOfRelease));
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                System.out.println("\nOur CD collection is: \n" );
          System.out.println(toString());
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        String result= " ";
        for( MusicCd tempCd : MusicCdList)
             result += tempCd.toString() + "\n";
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               System.out.println( tempCd.toString() );
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        ArrayList<MusicCd> searchResult = new ArrayList<MusicCd>();
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public class MusicCdStoreEngine{
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//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
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//The CD that you just removed is hero
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// 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:
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//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
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// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992
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//The CD that you just removed is hero
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//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
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public class readOperation{
     public String readString(String userInstruction)
          String aString = null;
          try
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               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
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}

//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.

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�Exception in thread "AWT-EventQueue-0"
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