Why StringBuffer does not override equals()
Is there any reason for StringBuffer to don't override equals()
Wargo
Not that I can think of. I'd expect two StringBuffer instances to be considered equivalent (equal) if they both would hand me equivalent results from their toString() methods. Instead, I guess someone at Sun decided that identity was preferable to equivalence for this class's equals() method.
Similar Messages
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...is not abstract and does not override abstract method compare
Why am I getting the above compile error when I am very clearly overriding abstract method compare (ditto abstract method compareTo)? Here is my code -- which was presented 1.5 code and I'm trying to retrofit to 1.4 -- followed by the complete compile time error. Thanks in advance for your help (even though I'm sure this is an easy question for you experts):
import java.util.*;
This program sorts a set of item by comparing
their descriptions.
public class TreeSetTest
public static void main(String[] args)
SortedSet parts = new TreeSet();
parts.add(new Item("Toaster", 1234));
parts.add(new Item("Widget", 4562));
parts.add(new Item("Modem", 9912));
System.out.println(parts);
SortedSet sortByDescription = new TreeSet(new
Comparator()
public int compare(Item a, Item b) // LINE CAUSING THE ERROR
String descrA = a.getDescription();
String descrB = b.getDescription();
return descrA.compareTo(descrB);
sortByDescription.addAll(parts);
System.out.println(sortByDescription);
An item with a description and a part number.
class Item implements Comparable
Constructs an item.
@param aDescription the item's description
@param aPartNumber the item's part number
public Item(String aDescription, int aPartNumber)
description = aDescription;
partNumber = aPartNumber;
Gets the description of this item.
@return the description
public String getDescription()
return description;
public String toString()
return "[descripion=" + description
+ ", partNumber=" + partNumber + "]";
public boolean equals(Object otherObject)
if (this == otherObject) return true;
if (otherObject == null) return false;
if (getClass() != otherObject.getClass()) return false;
Item other = (Item) otherObject;
return description.equals(other.description)
&& partNumber == other.partNumber;
public int hashCode()
return 13 * description.hashCode() + 17 * partNumber;
public int compareTo(Item other) // OTHER LINE CAUSING THE ERROR
return partNumber - other.partNumber;
private String description;
private int partNumber;
}Compiler error:
TreeSetTest.java:25: <anonymous TreeSetTest$1> is not abstract and does not over
ride abstract method compare(java.lang.Object,java.lang.Object) in java.util.Com
parator
public int compare(Item a, Item b)
^
TreeSetTest.java:41: Item is not abstract and does not override abstract method
compareTo(java.lang.Object) in java.lang.Comparable
class Item implements Comparable
^
2 errorsAccording to the book I'm reading, if you merely take
out the generic from the code, it should compile and
run in v1.4 (assuming, of course, that the class
exists in 1.4). I don't know what book you are reading but that's certainly incorrect or incomplete at least. I've manually retrofitted code to 1.4, and you'll be inserting casts as well as replacing type references with Object (or the erased type, to be more precise).
These interfaces do exist in 1.4, and
without the generics.Exactly. Which means compareTo takes an Object, and you should change your overriding method accordingly.
But this raises a new question: how does my 1.4
compiler know anything about generics? It doesn't and it can't. As the compiler is telling you, those interfaces expect Object. Think about it, you want to implement one interface which declares a method argument type of Object, in several classes, each with a different type. Obviously all of those are not valid overrides. -
Is not abstract and does not override abstract method actionPerformed
I dont how to corr. Please help!! and thank you very much!!
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class test extends JFrame implements ActionListener, ItemListener
private CenterPanel centerPanel;
private QuestionPanel questionPanel;
private ButtonPanel buttonPanel;
private ResponsePanel responsePanel;
private JButton b1,b2,b3,b4,b5; //Create five references to Jbutton instances
private JTextField t1,t2,t3,t4,t5; //Create five references to JTextField instances
private JLabel label1; //Create one references to JLabel instances
private JRadioButton q1,q2,q3; //Create three references to JRadioButton instances
private ButtonGroup radioGroup; //Create one references to Button Group instances
private int que1[] = new int[5]; //Create int[4] Array
private int que2[] = new int[5];
private int que3[] = new int[5];
private String temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8, temp9, temp10,
temp11, temp12, temp13, temp14, temp15;
public test (String header)
super(header);
Container container = getContentPane();
label1 = new JLabel ("PLease click on your response to ");
q1 = new JRadioButton("I understand most of the content of this subject",true);
add(q1);
q2 = new JRadioButton("I see the relevance of the subject to my degree",false);
add(q2);
q3 = new JRadioButton("The workload in this subject is appropriate",false);
add(q3);
radioGroup = new ButtonGroup(); //JRadioButton belong to ButtonGroup
radioGroup.add(q1);
radioGroup.add(q2);
radioGroup.add(q3);
JPanel buttonPanel = new JPanel();
JPanel responsePanel = new JPanel();
JPanel questionPanel = new JPanel();
JPanel centerPanel = new JPanel();
b1 = new JButton ("Strongly DISAGREE"); //Instantiate JButton with text
b1.addActionListener (this); //Register JButtons to receive events
b2 = new JButton ("DISAGREE");
b2.addActionListener (this);
b3 = new JButton ("Neither AGREE or DISAGREE");
b3.addActionListener (this);
b4 = new JButton ("AGREE");
b4.addActionListener (this);
b5 = new JButton ("Strongly AGREE");
b5.addActionListener (this);
buttonPanel.setLayout(new GridLayout(5,1));
buttonPanel.add(b1);
buttonPanel.add(b2);
buttonPanel.add(b3);
buttonPanel.add(b4);
buttonPanel.add(b5);
t1 = new JTextField ("0",3); //JTextField contains empty string
t2 = new JTextField ("0",3);
t3 = new JTextField ("0",3);
t4 = new JTextField ("0",3);
t5 = new JTextField ("0",3);
t1.setEditable( false );
t2.setEditable( false );
t3.setEditable( false );
t4.setEditable( false );
t5.setEditable( false );
responsePanel.setLayout(new GridLayout(5,1));
responsePanel.add(t1);
responsePanel.add(t2);
responsePanel.add(t3);
responsePanel.add(t4);
responsePanel.add(t5);
questionPanel.setLayout(new GridLayout(4,1));
questionPanel.add(label1);
questionPanel.add(q1);
questionPanel.add(q2);
questionPanel.add(q3);
centerPanel.add(buttonPanel,BorderLayout.CENTER);
centerPanel.add(responsePanel,BorderLayout.EAST);
container.add(centerPanel,BorderLayout.WEST);
container.add(questionPanel,BorderLayout.NORTH);
q1.addActionListener(
new ActionListener(){
public void actionPerformed( ActionEvent e )
{ //actionPerformed of all registered listeners
if (e.getSource() == b1) {
que1[0] = Integer.parseInt(t1.getText()) + 1;
String temp1 = String.valueOf(que1[0]);
t1.setText(temp1);
else if (e.getSource() == b2) {
que1[1] = Integer.parseInt(t2.getText()) + 1;
String temp2 = String.valueOf(que1[1]);
t2.setText(temp2);
else if (e.getSource() == b3) {
que1[2] = Integer.parseInt(t3.getText()) + 1;
String temp3 = String.valueOf(que1[2]);
t3.setText(temp3);
else if (e.getSource() == b4) {
que1[3] = Integer.parseInt(t4.getText()) + 1;
String temp4 = String.valueOf(que1[3]);
t4.setText(temp4);
else if (e.getSource() == b5) {
que1[4] = Integer.parseInt(t5.getText()) + 1;
String temp5 = String.valueOf(que1[4]);
t5.setText(temp5);
} //end action performed
q2.addActionListener(
new ActionListener(){
public void actionPerformed( ActionEvent e )
{ //actionPerformed of all registered listeners
if (e.getSource() == b1) {
que2[0] = Integer.parseInt(t1.getText()) + 1;
String temp6 = String.valueOf(que2[0]);
t1.setText(temp1);
else if (e.getSource() == b2) {
que2[1] = Integer.parseInt(t2.getText()) + 1;
String temp7 = String.valueOf(que2[1]);
t2.setText(temp7);
else if (e.getSource() == b3) {
que2[2] = Integer.parseInt(t3.getText()) + 1;
String temp8 = String.valueOf(que2[2]);
t3.setText(temp8);
else if (e.getSource() == b4) {
que2[3] = Integer.parseInt(t4.getText()) + 1;
String temp9 = String.valueOf(que2[3]);
t4.setText(temp9);
else if (e.getSource() == b5) {
que2[4] = Integer.parseInt(t5.getText()) + 1;
String temp10 = String.valueOf(que2[4]);
t5.setText(temp10);
} //end action performed
q3.addActionListener(
new ActionListener(){
public void actionPerformed( ActionEvent e )
{ //actionPerformed of all registered listeners
if (e.getSource() == b1) {
que3[0] = Integer.parseInt(t1.getText()) + 1;
String temp11 = String.valueOf(que3[0]);
t1.setText(temp11);
else if (e.getSource() == b2) {
que3[1] = Integer.parseInt(t2.getText()) + 1;
String temp12 = String.valueOf(que3[1]);
t2.setText(temp12);
else if (e.getSource() == b3) {
que3[2] = Integer.parseInt(t3.getText()) + 1;
String temp13 = String.valueOf(que3[2]);
t3.setText(temp13);
else if (e.getSource() == b4) {
que3[3] = Integer.parseInt(t4.getText()) + 1;
String temp14 = String.valueOf(que3[3]);
t4.setText(temp14);
else if (e.getSource() == b5) {
que3[4] = Integer.parseInt(t5.getText()) + 1;
String temp15 = String.valueOf(que3[4]);
t5.setText(temp15);
} //end action performed
}//end constructor test
public void itemStateChanged(ItemEvent item) {
//int state = item.getStateChange();
//if (q1 == item.SELECTED)
public class ButtonPanel extends JPanel
public ButtonPanel()
public class CenterPanel extends JPanel
public CenterPanel()
public class QuestionPanel extends JPanel
public QuestionPanel()
public class ResponsePanel extends JPanel
public ResponsePanel()
public static void main(String [] args)
test surveyFrame = new test("Student Survey") ;
surveyFrame.setSize( 500,300 );
surveyFrame.setVisible(true);
surveyFrame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
}//end main
}//end class testis not abstract and does not override abstract method actionPerformed
Oh, I see that the title of your post is an error message? Ok. Well, the test class is declared as implementing an ActionListener. That means the test class must have an actionPerformed() method. Your test class apparently does not.
It does not appear that the test class needs to implement ActionListener. You are using annonymous classes as listeners. -
Is not abstract and does not override abstract method tablechanged
I will remove all the gui code to make it shorter, but my problem lies with my InteractiveTableModelListener.
public class Meet extends JPanel{
private static void createAndShowGUI() {
JFrame frame = new JFrame("MEET_dataTable");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new Meet(), BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
public class InteractiveTableModelListener implements TableModelListener {
public void TableChanged(TableModelEvent evt) {
if (evt.getType() == TableModelEvent.UPDATE) {
int column = evt.getColumn();
int row = evt.getFirstRow();
dataTable.setColumnSelectionInterval(column + 1, column + 1);
dataTable.setRowSelectionInterval(row, row);
class InteractiveRenderer extends DefaultTableCellRenderer {
protected int interactiveColumn;
public InteractiveRenderer(int interactiveColumn) {
this.interactiveColumn = interactiveColumn;
public Component getTableCellRendererComponent(JTable dataTable,
Object value, boolean isSelected, boolean hasFocus, int row,
int column)
Component c = super.getTableCellRendererComponent(dataTable, value, isSelected, hasFocus, row, column);
if (column == interactiveColumn && hasFocus) {
if ((Meet.this.tableModel.getRowCount() - 1) == row &&
!Meet.this.tableModel.hasEmptyRow())
Meet.this.tableModel.addEmptyRow();
highlightLastRow(row);
return c;
public void highlightLastRow(int row) {
int lastrow = tableModel.getRowCount();
if (row == lastrow - 1) {
dataTable.setRowSelectionInterval(lastrow - 1, lastrow - 1);
else {
dataTable.setRowSelectionInterval(row + 1, row + 1);
dataTable.setColumnSelectionInterval(0, 0);
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}As i say, i have removed all the gui code to make it shorter, but in this code i create the table and add all the model to it. I am being returned with the error
Meet.InteractiveTableModelListener is not abstract and does not override abstract method tableChanged(javax.swing.event.TableModelEvent)in javax.swing.event.TableModelListener
what would be causing this error?
CheersSorry, just figured out my silly error, the method is tableChanged not TableChanged.
cheers
TOPIC CLOSED
Edited by: nick2price on Sep 11, 2008 7:08 AM -
Is not abstract and does not override abstract method ERROR
Hello. I'm new at all this, and am attempting to recreate a sample code out of my book (Teach Yourself XML in 24 Hours), and I keep getting an error. I appriciate any help.
This is the Error that I get:
DocumentPrinter is not abstract and does not override abstract method skippedEntity(java.lang.String) in org.xml.sax.ContentHandler
public class DocumentPrinter implements ContentHandler, ErrorHandler
^This is the sourcecode:
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
public class DocumentPrinter implements ContentHandler, ErrorHandler
// A Constant containing the name of the SAX parser to use.
private static final String PARSER_NAME = "org.apache.xerces.parsers.SAXParser";
public static void main(String[] args)
// Check to see whether the user supplied any command line arguments. If not, print an error and exit.
if (args.length == 0)
System.out.println("No XML document path specified.");
System.exit(1);
// Create a new instance of the DocumentPrinter class.
DocumentPrinter dp = new DocumentPrinter();
try
// Create a new instance of the XML Parser.
XMLReader parser = (XMLReader)Class.forName(PARSER_NAME).newInstance();
// Set the parser's content handler
// parser.setContentHandler(dp);
// Set the parsers error handler
parser.setErrorHandler(dp);
// Parse the file named in the argument
parser.parse(args[0]);
catch (Exception ex)
System.out.println(ex.getMessage());
ex.printStackTrace();
public void characters(char[] ch, int start, int length)
String chars ="";
for (int i = start; i < start + length; i++)
chars = chars + ch;
System.out.println("Recieved characters: " + chars);
public void startDocument()
System.out.println("Start Document.");
public void endDocument()
System.out.println("End of Document.");
public void startElement(String namespaceURI, String localName, String qName, Attributes atts)
System.out.println("Start element: " + localName);
for (int i = 0; i < atts.getLength(); i++)
System.out.println(" Attribute: " + atts.getLocalName(i));
System.out.println(" Value: " + atts.getValue(i));
public void endElement(String namespaceURI, String localName, String qName)
System.out.println("End of element: " + localName);
public void startPrefixMapping(String prefix, String uri)
System.out.println("Prefix mapping: " + prefix);
System.out.println("URI: " + uri);
public void endPrefixMapping(String prefix)
System.out.println("End of prefix mapping: " + prefix);
public void ignorableWhitespace(char[] ch, int start, int length)
System.out.println("Recieved whitespace.");
public void processingInstruction(String target, String data)
System.out.println("Recieved processing instruction:");
System.out.println("Target: " + target);
System.out.println("Data: " + data);
public void setDocumentLocation(Locator locator)
// Nada
public void error(SAXParseException exception)
System.out.println("Parsing error on line " + exception.getLineNumber());
public void fatalError(SAXParseException exception)
System.out.println("Fatal parsing error on line " + exception.getLineNumber());
public void warning(SAXParseException exception)
System.out.println("Warning on line " + exception.getLineNumber());Check to make sure that the arguments are consistent with your ContentHandler class. Probably the wrong type.
I think you forgot to include the skippedEntity method, it seems to be missing. Even if an implemented class has a method that you are not using, you still have to include the method in your code even if it doesn't do anything.
Message was edited by:
ChargersTule1 -
Product is not abstract and does not override abstract method
Received the following errors.
Product.java:3: Product is not abstract and does not override abstract method ge
tDisplayText() in Displayable
public class Product implements Displayable
^
Product.java:16: getDisplayText() in Product cannot implement getDisplayText() i
n Displayable; attempting to use incompatible return type
found : void
required: java.lang.String
public void getDisplayText()
^
2 errors
Code reads as follows
import java.text.NumberFormat;
public class Product implements Displayable
private String code;
private String description;
private double price;
public Product()
this.code = "";
this.description = "";
this.price = 0;
public void getDisplayText()
String message =
"Code: " + code + "\n" +
"Description: " + description + "\n" +
"Price: " + this.getFormattedPrice() + "\n";
public Product(String code, String description, double price)
this.code = code;
this.description = description;
this.price = price;
public void setCode(String code)
this.code = code;
public String getCode(){
return code;
public void setDescription(String description)
this.description = description;
public String getDescription()
return description;
public void setPrice(double price)
this.price = price;
public double getPrice()
return price;
public String getFormattedPrice()
NumberFormat currency = NumberFormat.getCurrencyInstance();
return currency.format(price);
Please help!Received the following errors.
Product.java:3: Product is not abstract and does not
override abstract method ge
tDisplayText() in Displayable
public class Product implements Displayable
^
Product.java:16: getDisplayText() in Product cannot
implement getDisplayText() i
n Displayable; attempting to use incompatible return
type
found : void
required: java.lang.String
public void getDisplayText()
^
2 errors
Code reads as follows
Please use the code tags when posting code. There is a code button right above the text box where you enter your post. Click on it and put the code between the code tags.
These error messages are quite clear in telling what is wrong. You have an Interface called Displayable that specifies a method something like thispublic String getDisplayText() {But in your Product source code, you created thismethodpublic void getDisplayText() {The compiler is complaining because the methods are not the same.
You also need to return a String in the method probalby like thisreturn message; -
PO creation-ME21n-Why SAP does not check company code and Plant relation
Hi All,
Does someone know, why SAP does not check Plant and company code relation at the time of PO creation or how can we put validation between plant and company code at the time of PO creation.
<b>Example:</b> Suppose i have a company 0001 which is assinged to Plant 0001. when i am creating a PO with another company code 0002(Entering at header level-Org, data) and using Plant 0001 at line item level. SAP does not do this validation.
How can we put this check in place?
Thanks in advance.
DeepakHello Deepak,
There are three types of purchasing
- Company code specific :You need to assign company code to Pur organization
- Plant specific : You must assign plant to pur organization
- Cross company purchasing: No assignment between company code and pur organization.
In the case 3, the system will not check company code and plant relationship, but it will check plant and pur organization specific.
The following is the copy of sap help text:
You can assign a purchasing organization to one company code. This is company-specific purchasing.
You can assign a purchasing organization to no company code. This purchasing organization can then procure for all plants assigned to it, irrespective of the company code to which the plant belongs.
Since each plant must be assigned to a company code, the company code can be determined via the plant in each procurement transaction, even if the procuring purchasing organization is not assigned to a company code.
A purchasing organization must be assigned to one or more plants. This is plant-specific purchasing.
Now, check your company-code and purchase organization assignment.
Hope this helps.
Regards
Arif Mansuri -
why facetime does not working with any carrier in u.s expect att although the iphone is factory unlocked
Facetime only works via WiFi. Are you trying to set up Facetime with a T-Mobile account?
-
Hi Pros,
in my bex query, there is a CKF OT hours, having a value 30.000, when I set a condition for 'OT hours = 30.000', but get no result out. could you please tell why condition does not work.HI,
please check the "Characteristic Assignment" Tab in change condition window.
In that tab default selection as "All Characteristic in the drill down independently" change that selection as "Individual characteristic and Char. combinations" and choose the particular characteristic. for ex OT hours against employee means select employee alone.
Regards
Sureshkumar C -
Is it free to send messages in iMessage to another county? if yes why it does not show that these messages from iMessage?
if you receive an imessage not on any internet connection you will receive it as a sms (green) and yes it counts toward your texting plan
-
Why RSS does not work with my OS X 10.8.2?
Why RSS does not work with my OS X 10.8.2? There was no problem before the upgrade to the Mountain Lion.
By clicking on the RSS icon I'm getting a message:
"No RSS reader is installed. Safari can't open the feed because Safari can't display RSS feeds"
In Chrome I get xml file of the RSS site.
Should I buy something what I didn't need with the Snow Leopard?
Thanks for your help.
Message was edited by: PZA22 -
Why Set does not have get() method
Can some one tell me why set does not have get method?...
user12203354 wrote:
ya u are right that designer of this class thought there is no implementation required for get but why he/she thought like this...
there must be some valid reason for the same.Because a Set's purpose is not to keep things in order; it's to ensure there are no duplicate entries. Set would require extra code to be able to keep track of an order.
Note that there is a Set implementation that does keep track of insertion order--LinkedHashSet--but it doesn't have a get() method. -
Why java does not support multiple inheritance ???
Hai friends ..iam new to java .. i have doubt ..plz help me
Why java does not support multiple inheritance ???The reasons for omitting multiple inheritance from the Java language mostly stem from the "simple, object oriented, and familiar" goal.
To understand multiple inheritance, the learner needs some level of expertise like virtual derivations etc in c++. Multiple inheritance will allow method duplication, and throws the learner into confusion which method might be called by the compiler in which scenario at run time.
Even though this answer seems to be funny, this is the actual reason why java omitted multiple inheritance of classes.
But java support multiple inheritance of interfaces. Multiple interface inheritance allows an object to inherit many different method signatures with the caveat that the inheriting object must implement those inherited methods. -
Hi, I have downloaded itunes on windows 7,when I click the icon on my desktop nothing happens,does anyone know why itunes does not open?
If you only changed the name of your ID rather than creating a new ID, just go to Settins>iCloud and tap Delete Account then sign back in with the new name. (Deleting the account from your phone does not delete it from iCloud. Your data will be synced back to your phone when you sign back in.)
If you created a new ID, you'll have to go to Settings>iCloud on your phone and turn all data you are syncing with iCloud (contacts, calendars, etc.) to Off. When prompted choose to keep the data on your iPhone. (If you are syncing iWork documents with iCloud, also open your iWork apps and turn off iCloud syncing and choose to keep the documents on your phone.) After everything is turned off, scroll to the bottom and tap Delete Account. Next, set up a new iCloud account using your other ID, then turn syncing for your data (contacts, etc.) back to On. When prompted, choose Merge. This will upload the data to your new account.
You won't lose any photos in your camera roll or photo library. If you have any photos in your photo stream that are over 30 days old that are not in your camera roll or saved on your computer, be sure to save these to the camera roll before deleting the account. To do so, open the photo stream album on your iPhone in the thumbnail view, tap Edit, tap all the photos you need to save to select them, tap Share, then tap Save to Camera Roll. -
Why itunes does not sync the calendar?
why itunes does not sync the calendar?
Hey ThierryWillame,
Thanks for the question. Were these songs purchased from the iTunes Store? If so, see the following resource. If not, follow the same steps for the content, based on how you acquired it (delete and re-add).
Songs in iTunes may not play back completely
http://support.apple.com/kb/TS4357
Symptoms
Occasionally, if a song purchased from the iTunes Store on a Mac or PC was not downloaded completely, the song may not play back fully. The song may abruptly stop during playback, and iTunes may start playing the next song in your library or playlist.
Resolution
If iTunes in the Cloud is available in your country, try the following steps to resolve the issue:
1. Delete the purchased song that is exhibiting the problem from your iTunes library.
2. Click on the Purchased link in the iTunes Store to view your previously purchased music.
3. Download your previously purchased song from this list.
Note: iTunes in the Cloud, which allows you to download previously purchased songs from the iTunes Store, is not available in every country. Learn if iTunes in the Cloud is offered in your country.
Additional Information:
iTunes 11 for Mac: Delete songs, playlists, or other items
http://support.apple.com/kb/PH12159
Download past purchases
http://support.apple.com/kb/HT2519
Thanks,
Matt M.
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