Could anyone help me fix it? I think it's simple.
Here the class of lowLevelQController is LowLevelQuestionController : UITableViewController.
Is UITableViewController a subclass of UIViewController? Why did the complier blame me?
Thank you a lot!!!
If you added an image, we can't see it.
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@implementation SecondViewController
-(IBAction) pushLowLevelQuestionView: (id) sender {
[self.navigationController pushViewController:lowLevelQController animated:YES];
There is a warning saying that "Incompatible Objective-C types 'struct LowLevelQuestionController *' expected 'struct UIViewController *' when passing argument 1 of 'pushViewController: animated: 'from distinct Objective-C type"
The class of lowLevelQController is LowLevelQuestionController : UITableViewController.
Isn't UITableViewController a subclass of UIViewController??
How come the complier blame me?
Thanks a lot!!!Check your #import(s)
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ReadString problem!! could anyone help me take a look
hi... i am doing a music Cd list program. there are two operation i need to do 1) insertion and 2) deletion. i have implemented my own sortList to do it... i work fine when i do the insertion to the list but it can`t perform well on deletion.. However, i am sure that my list deletion algoritm is totally correct... i perform two test as following to ensure my deletion is correct..but i think the problem is on my readString fucntoon ...could anyone help me take a look!!
public class SortedListTesting
SortedList musicCdList = new SortedList();
ReadOperation theRo = new ReadOperation();
//ErrorCheckingOperation theEco = new ErrorCheckingOperation();
MusicCd temp;
public void insertCdWithReadStringFunction()
String musicCdsTitle;
//try to prompt the user `s cd `s title for insertion to our List
musicCdsTitle = theRo.readString("Please enter your CD`s title : ");
musicCdList.insert(new MusicCd(musicCdsTitle));
System.out.println("Number of items in the list: "
+ musicCdList.getNumberOfItems() + "\n" + musicCdList.toString() );
public void deleteCdWithReadStringFunction()
try
//try to prompt the user `s delected cd `s title
String keyword = theRo.readString("Please enter CD `s title to be delected from SMOA : ") ;
// System.out.println("The CD that you just deleted is " + keyword);
temp = musicCdList.delete(keyword);
System.out.println("Number of items in the list: "
+ musicCdList.getNumberOfItems() + "\n" + temp );
catch ( InvalidDataException errorMsg )
System.out.println( errorMsg.getMessage() + "\n" );
System.out.println("Now, We have " + musicCdList.getNumberOfItems() + " items in the list, and the items as following :\n" + musicCdList.toString() );
public void insertCd()
String musicCdsTitle;
//try to input the string directly to our list
musicCdsTitle = "ann";//theRo.readString("Please enter your CD`s title : ");
musicCdList.insert(new MusicCd(musicCdsTitle));
System.out.println("Now, the number of items in the list: "
+ musicCdList.getNumberOfItems() + "\n" + musicCdList.toString() );
public void deleteCd()
try
//try to input the String directly
String keyword = "ann"; //theRo.readString("Please enter CD `s title to be delected from SMOA : ") ;
System.out.println("The CD that you just deleted is " + keyword);
temp = musicCdList.delete(keyword);
//System.out.println("Number of items in the list: "
// + musicCdList.getNumberOfItems() + "\n" + temp );
catch ( InvalidDataException errorMsg )
System.out.println( errorMsg.getMessage() + "\n" );
System.out.println("Now, We have " + musicCdList.getNumberOfItems() + " items in the list, and the items as following :\n" + musicCdList.toString() );
public static void main(String[] args)
SortedListTesting st = new SortedListTesting();
//These two testing i am trying to show that my list is working fine for inseting and deleting
//i try to input the cd `s title name " ivan " by my readString function, it work fine for insertion
//but it is fail in delete fuction..it shows that "ivan not found: cannot be deleted" ...At first,
//i think it is my delete function problem..but it is not my delete function problem...cos it work fine if
//input the string directly from the function...i think the issues works on my readString fucntion
//i try a milllion of time but i still got the same problem ...pls help....
System.out.println("\t...Testing for input from readString fuction...\t");
st.insertCdWithReadStringFunction();
st.deleteCdWithReadStringFunction();
//it work fine for input the string directly in the function, it show as following...
System.out.println("\t...Testing for input the string directly ...\t");
st.insertCd();
st.deleteCd();
javac SortedListTesting.java
Exit code: 0
java SortedListTesting ...Testing for input from readString fuction...
Please enter your CD`s title : ivan <<-inserting the cd`s title to our list
Number of items in the list: 1 <<- sucessfully insert to our list
Title: ivan
Please enter CD `s title to be delected from SMOA : ivan <<- try to delete from our list, i type "ivan" here
ivan not found: cannot be deleted <<- problem occur , it should be fine in there
Now, We have 1 items in the list, and the items as following :
Title: ivan <<- it should not be shown
...Testing for input the string directly ...
Now, the number of items in the list: 2
Title: ann <<- i pass "ann" String directly to insertion function
Title: ivan <<- it is the left over from the preivous process
The CD that you just deleted is ann <<- i pass " ann" String directly to my deletion
Now, We have 1 items in the list, and the items as following : <<- it successfully delete .... it prove that my deletion function is working properly....i think it is on readString problem..
Title: ivan
Exit code: 0*/
//it seems that the readString function read the string
//at the first time does not match the second time
//reading, it makes it can`t find the stuff from the list ..
import java.util.*;
public class ReadOperation{
//pls help check here....thx
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;
public class SortedList extends ShellSortedList implements SortedListInterface<MusicCd>
public SortedList()
super();
public void insert( MusicCd aCd )
MusicCdNode cdNode = new MusicCdNode( aCd );
cdNode.setNext( head );
head = cdNode;
numberOfItems++;
public MusicCd delete(String aCdsTitle)
throws InvalidDataException
MusicCdNode current = head;
MusicCdNode previous = null;
while( current != null
&& current.getMusicCd().getCdTitle() != aCdsTitle)
previous = current;
current = current.getNext();
if (current == null ) //not found
throw new InvalidDataException(aCdsTitle
+ " not found: cannot be deleted" );
else
if( current == head )
head = head.getNext(); //delete head
else
previous.setNext( current.getNext() );
numberOfItems--;
return current.getMusicCd();
public MusicCd modify(String anExistedCdsTitle, String aModifyCdsTitle)
throws InvalidDataException
MusicCdNode current = head;
while( current != null
&& current.getMusicCd().getCdTitle() != anExistedCdsTitle)
current = current.getNext();
if ( current == null )
throw new InvalidDataException( anExistedCdsTitle
+ " not found: cannot be deleted" );
else
MusicCd tempCd = new MusicCd();
tempCd.setCdTitle(aModifyCdsTitle);
current.setMusicCd(tempCd);
return current.getMusicCd();
}//for better understand of my program
public interface SortedListInterface<T>
//public SortedList();
public void insert( T anElement );
public T delete(String searchKey)
throws InvalidDataException;
public T modify(String searchKey, String aModifyTitle)
throws InvalidDataException;
public abstract class ShellSortedList
protected MusicCdNode head;
protected int numberOfItems;
public ShellSortedList()
head = null;
numberOfItems = 0;
public int getNumberOfItems()
return numberOfItems;
public boolean isEmpty()
return( numberOfItems == 0 );
public boolean isDuplicate(String newCD)
boolean found = false;
MusicCdNode current = head;
for( int i=0; i < numberOfItems; i++)
if(current.getMusicCd().getCdTitle().equals(newCD))
System.out.println("Duplicate Cd is found !!");
found = true;
current = current.getNext();
return found;
public String toString()
String listString = " ";
MusicCdNode current = head;
for( int i=0; i < numberOfItems; i++)
listString += current.getMusicCd().toString() + "\n";
current = current.getNext();
return listString;
public class MusicCdNode
private MusicCd cd;
private MusicCdNode next;
// Default constructor
public MusicCdNode()
// Description: Initialize the reference for the cd object and the value of next to null.
// Postcondition: cd = null; next = null;
cd = null;
next = null;
// Parameterized constructor
public MusicCdNode(MusicCd aCd)
// Description: Set the reference for the cd object according to the parameters and value of next to null.
// Postcondition: cd = aCd; next = null;
cd = aCd;
next = null;
public MusicCd getMusicCd()
return new MusicCd(cd.getCdTitle());
public MusicCdNode getNext()
return next;
public void setMusicCd(MusicCd aCd)
cd = new MusicCd(aCd.getCdTitle());
public void setNext(MusicCdNode aCd)
next = aCd;
// File: MusicCd.java
// Author: Chi Lun To (Ivan To)
// Created on: June 5, 2007
// Class Description
// The MusicCd class defines a music cd object that contain the CD`s title, CD`s artist/GroupName,
// CD`s yearOfRelease , Cd`s music genre, and any comment of the Cd`s. This class provides functions
// to access the musicCdsTitle, artistOrGroupName, yearOfRelease, musicGenre, and aComment variable.
// Class Invariant: All MusicCd objects have a string musicCdsTitle, string artistOrGroupName, integer yearOfRelease
// String musicGenre, and String aComment. A string type musicCdsTitle,artistOrGroupName, musicGenre,or aComment of "None"
// indicates no real name specified yet. A integer yearOfRelease of 1000 indicates no real years specific yet.
public class MusicCd
String theCdTitle;// the CD`s Title
// Default constructor
public MusicCd()
// Description: Initialize theCdTitle to empty string
// Postcondition: theCdTitle = " ";
theCdTitle = " ";
}//end constructor
// Parameterized constructor
public MusicCd(String aCdTitle)
// Description: Set theCdTitle according to the parameters
// Postcondition: theCdTitle = aCdTitle;
theCdTitle = aCdTitle;
} // end constructor
// Accessor function : getCdTitle( ) function
public String getCdTitle()
// Description: Method to return the theCdTitle
// Postcondition: the value of theCdTitle is returned
return theCdTitle;
}// end getCdTitle( ) function
// Mutator function: setCdTitle( ) function
public void setCdTitle(String aCdTitle)
// Description: Method to set theCdTitle according to the parameter
// Postcondition: theCdTitle = aCdTitle;
theCdTitle = aCdTitle;
}// end setCdTitle( ) function
// toString( ) function
public String toString()
// Description: Method to return the theCdTitle
// Postcondition: the value of theCdTitle is returned as String
return("Title: " + theCdTitle );
}// end toString( ) function
// File: InvalidDataException.java
// Author: Chi Lun To (Ivan To)
// Created on: June 5, 2007
// Class Description
// The InvalidDataException class is a self- defined exception class which handles
// the issues that may arise with return value of the deleted and modify function.
// For example, the issue will occurs if the user try to delete the music cd from a empty list
// or deleting a music cd that does not exist on the list. it would return null to the user. But, the user
// expected to return an obeject reference of the music cd.Therefore, we instantiate InvalidDataException
// class to handle this issue.
// Class Invariant:
// InvalidDataException class is a self-defining exceptional class which
// inherits the existing functionality of the Exception class.
public class InvalidDataException extends Exception
//Parameterized constructor
public InvalidDataException( String s )
super( s ); //inherits the existing functionality of the Exception class.
}Message was edited by:
Ivan1238
Message was edited by:
Ivan1238thx for your suggestion ..but i did try to skip my code..but i am sure if u guy understand what i am trying to ask ..so i try to show my all program for u guy better undrstand my problem ...the first three paragraph of code i hope u guy could focus on it ....i try ask the user to input the cd`s title to our insert list by using a function call readString( ) and i use this method to ask the user what cd they want to be delete from the list ...but it doesn`t work when i try to perform the delete cd funtion. At first, i think it should be my deleteCd( ) problem ..but i do some testing on it..it works fine if i pass a String directly to my function instead of using readString() function to perform ...therefore, i am sure my delete function working fine....i am thinking if it is my readString() problem make my deletion does not perform well...thx for u guy help
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there is no rt.jar in java lib could anyone help me downloading it ,or tell me where is this rt.jar, there is no rt.jar in java lib could anyone help me downloading it ,or tell me where is this rt.jar
thx for your suggestion ..but i did try to skip my code..but i am sure if u guy understand what i am trying to ask ..so i try to show my all program for u guy better undrstand my problem ...the first three paragraph of code i hope u guy could focus on it ....i try ask the user to input the cd`s title to our insert list by using a function call readString( ) and i use this method to ask the user what cd they want to be delete from the list ...but it doesn`t work when i try to perform the delete cd funtion. At first, i think it should be my deleteCd( ) problem ..but i do some testing on it..it works fine if i pass a String directly to my function instead of using readString() function to perform ...therefore, i am sure my delete function working fine....i am thinking if it is my readString() problem make my deletion does not perform well...thx for u guy help
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