Can you see the problem?
i'm trying to write a simple image viewer application.
Can you see the problem. i can't. i'll appreciate any advice or help?
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.io.*;
public class SimpleViewer extends Frame {
protected Image awtImage;
public void loadAndDisplay(String filename) {
Image img = readImage(filename);
awtImage = img;
int width = img.getWidth(this);
int height = img.getHeight(this);
displayImage(img, width, height);
public void displayImage(Image img, int width, int height) {
addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
setTitle("Simple Viewer ");
pack();
setSize(new Dimension(width, height));
show();
repaint();
public image readImage(String filename) {
Image image = Toolkit.getDefaultToolkit().getImage(imageName);
MediaTracker imageTracker = new MediaTracker(this);
imageTracker.addImage(image, 0);
try{
imageTracker.waitForID(0);
}catch(InterruptedException e){ return null;}
return image;
public void paint(Graphics g){
Rectangle rect = this.getBounds();
if(awtImage != null) {
g.drawImage(awtImage, 0,0,rect.width, rect.height, this);
public static void main(String[] args){
SimpleViewer ip = new SimpleViewer();
if(args.length <1) {
System.out.println("Enter a valid image file name");
System.exit(0);
ip.loadAndDisplay(args[0]);
}
check this line and tell me what you see... after all, it's the source of your compiler errors...
public image readImage(String filename) {
Image image = Toolkit.getDefaultToolkit().getImage(imageName);once you figure that out, it will work...
( hint : check variable names and capitalization of names )
- MaxxDmg...
- ' He who never sleeps... '
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Dear People,
I am doing a simple program that creates a ContactBook and allows keyboard entry of lastName, telephoneNumber and emailAddress.
I have a few error messages that say parenthesis missing but I don't
see any missing ! :
"Note.java": Error #: 200 : '{' expected at line 15
"Note.java": Error #: 200 : '}' expected at line 59
"TryContactBook.java": Error #: 200 : ')' expected at line 30
"TryContactBook.java": Error #: 200 : ')' expected at line 42
below is the coding
thank you in advance
Stan
import java.util.*;
public class TryContactBook
private Note note;
public static void main(String[] args)
ContactBook myContactBook = new ContactBook();
FormattedInput input = new FormattedInput();
Note note = new Note();
System.out.println("Enter the number of new notes you wish to record ");
int numberOfNotes = input.readInt();
System.out.println("Ready to record " + numberOfNotes + "note(s) ");
for (int i = 0; i < numberOfNotes; i++)
try
System.out.print("Enter a last name: ");
note.setLastNaame(input.readString());
System.out.println("last name input is: " + notes.getLastName());
catch (InvalidUserInputException e)
System.out.println("InvalidUserInputException thrown when inputting last name. \n" +
e.getMessage());
try
System.out.println("Enter a telephone number ");
note.setTelephoneNumber(input.readString();
System.out.println("telephone number input is: " + notes.getTelephoneNumber());
catch (InvalidUserInputException e)
System.out.println("InvalidUserInputException thrown when inputting last name. \n" +
e.getMessage());
try
System.out.println("Enter an e-mail address ");
note.setTelephoneNumber(input.readString();
System.out.println("e-mail address input is: " + notes.getEmailAddress());
catch (InvalidUserInputException e)
System.out.println("InvalidUserInputException thrown when inputting last name. \n" +
e.getMessage());
=====================================================================
import java.util.*;
* A class to maintain an arbitrarily long list of contacts.
* Notes are numbered for external reference by a human user.
* In this version, note numbers start at 0.
* @author Stan Dominski
public class ContactBook
// Storage for an arbitrary number of notes.
private ArrayList notes;
* Perform any initialization that is required for the
* notebook.
public ContactBook()
notes = new ArrayList();
* Store a new note into the notebook.
* @param note The note to be stored.
public void storeNote(String note)
notes.add(note);
* @return The number of notes currently in the notebook.
public int numberOfNotes()
return notes.size();
* Show a note.
* @param noteNumber The number of the note to be shown.
public void showNote(int noteNumber)
if(noteNumber < 0 || noteNumber > numberOfNotes())
// This is not a valid note number, so do nothing.
else
// This is a valid note number, so we can print it.
System.out.println(notes.get(noteNumber));
* Remove a note from the notebook if it exists.
* @param noteNumber The number of the note to be removed.
public void removeNote(int noteNumber)
if(noteNumber < 0 || noteNumber > numberOfNotes())
System.out.println("noteNumber is not valid.");
else
notes.remove(noteNumber);
* List all the notes in the notebook
public void listNotes()
Iterator i = notes.iterator();
Iterator myIterator = notes.iterator();
while(i.hasNext() && myIterator.hasNext())
System.out.print(notes.indexOf(i.next() ) + ":" );
System.out.println("" + myIterator.next());
=======================================================================
import java.util.*;
public class Note
private ArrayList contactInfo;
private String lastName;
private String telephoneNumber;
private String emailAddress;
public class Note()
contactInfo = new ArrayList();
this.lastName = lastName;
this.telephoneNumber = telephoneNumber;
this.emailAddress = emailAddress;
public void setLastName(String lastName)
this.lastName = lastName;
public String getLastName()
return lastName;
public void setTelephoneNumber(String telephoneNumber)
this.telephoneNumnber = telephoneNumber;
public String getTelephoneNumber()
return telephoneNumber;
public void setEmailAddress(String emailAddress)
this.emailAddress = emailAddress;
public String getEmailAddress()
return emailAddress;
======================================================================
import java.io.*;
import java.util.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class FormattedInput
public String readString() throws InvalidUserInputException
if(readToken() == tokenizer.TT_WORD || ttype == '\"' || ttype == '\'')
return tokenizer.sval;
else
throw new InvalidUserInputException(" readString() failed. ..... Input data is not a string");
// Method to read an int value
public int readInt() throws InvalidUserInputException
if (readToken() != tokenizer.TT_NUMBER)
throw new InvalidUserInputException(" readInt() failed. " + " input data not numeric");
else
return (int)tokenizer.nval; // value is numeric so return as int
//helper method to read the next token
private int readToken()
try
ttype = tokenizer.nextToken();
return ttype;
catch(IOException e)
e.printStackTrace(System.err);
System.exit(1);
return 0;
//object to tokenize input from the standard input stream
private StreamTokenizer tokenizer = new StreamTokenizer(
new BufferedReader(
new InputStreamReader(System.in)));
private int ttype; //stores the token type code
======================================================================
import java.io.StreamTokenizer;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
public class InvalidUserInputException extends Exception
public InvalidUserInputException() { }
public InvalidUserInputException(String message)
super(message);I have out comments on the errors I found. There might be more.
I couldn't get the indentation to work so it will look a bit funny.
//David
"Note.java": Error #: 200 : '{' expected at line 15
"Note.java": Error #: 200 : '}' expected at line 59
"TryContactBook.java": Error #: 200 : ')' expected at
line 30
"TryContactBook.java": Error #: 200 : ')' expected at
line 42
import java.util.*;
public class TryContactBook
private Note note;
public static void main(String[] args)
ContactBook myContactBook = new ContactBook();
FormattedInput input = new FormattedInput();
Note note = new Note();
System.out.println("Enter the number of new notes you wish to record ");
int numberOfNotes = input.readInt();
System.out.println("Ready to record " + numberOfNotes + "note(s) ");
for (int i = 0; i < numberOfNotes; i++)
try
System.out.print("Enter a last name: ");
note.setLastNaame(input.readString());
System.out.println("last name input is: " +
is: " + notes.getLastName());
catch (InvalidUserInputException e)
System.out.println("InvalidUserInputException
xception thrown when inputting last name. \n" +
e.getMessage());
try
System.out.println("Enter a telephone
telephone number ");
note.setTelephoneNumber(input.readString()); // 1 error
System.out.println("telephone number input
er input is: " + notes.getTelephoneNumber());
catch (InvalidUserInputException e)
System.out.println("InvalidUserInputException
xception thrown when inputting last name. \n" +
e.getMessage());
try
System.out.println("Enter an e-mail address
l address ");
note.setTelephoneNumber(input.readString()); // 2 error
System.out.println("e-mail address input
ss input is: " + notes.getEmailAddress());
catch (InvalidUserInputException e)
System.out.println("InvalidUserInputException
xception thrown when inputting last name. \n" +
e.getMessage());
=======================================================
=============
import java.util.*;
* A class to maintain an arbitrarily long list of
contacts.
* Notes are numbered for external reference by a human
user.
* In this version, note numbers start at 0.
* @author Stan Dominski
public class ContactBook
// Storage for an arbitrary number of notes.
private ArrayList notes;
* Perform any initialization that is required for
for the
* notebook.
public ContactBook()
notes = new ArrayList();
* Store a new note into the notebook.
* @param note The note to be stored.
public void storeNote(String note)
notes.add(note);
* @return The number of notes currently in the
the notebook.
public int numberOfNotes()
return notes.size();
* Show a note.
* @param noteNumber The number of the note to be
o be shown.
public void showNote(int noteNumber)
if(noteNumber < 0 || noteNumber >
umber > numberOfNotes())
// This is not a valid note number, so do
mber, so do nothing.
else
// This is a valid note number, so we can
, so we can print it.
System.out.println(notes.get(noteNumber));
* Remove a note from the notebook if it exists.
* @param noteNumber The number of the note to be
o be removed.
public void removeNote(int noteNumber)
if(noteNumber < 0 || noteNumber >
mber > numberOfNotes())
System.out.println("noteNumber is not
is not valid.");
else
notes.remove(noteNumber);
* List all the notes in the notebook
public void listNotes()
Iterator i = notes.iterator();
Iterator myIterator = notes.iterator();
while(i.hasNext() && myIterator.hasNext())
System.out.print(notes.indexOf(i.next() )
f(i.next() ) + ":" );
System.out.println("" +
println("" + myIterator.next());
=======================================================
===============
import java.util.*;
public class Note
private ArrayList contactInfo;
private String lastName;
private String telephoneNumber;
private String emailAddress;
public class Note()
contactInfo = new ArrayList();
this.lastName = lastName;
this.telephoneNumber = telephoneNumber;
this.emailAddress = emailAddress;
public void setLastName(String lastName)
this.lastName = lastName;
public String getLastName()
return lastName;
public void setTelephoneNumber(String
neNumber(String telephoneNumber)
this.telephoneNumnber =
telephoneNumnber = telephoneNumber;
public String getTelephoneNumber()
return telephoneNumber;
public void setEmailAddress(String
lAddress(String emailAddress)
this.emailAddress = emailAddress;
public String getEmailAddress()
return emailAddress;
}} // 3 error
=======================================================
==============
import java.io.*;
import java.util.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class FormattedInput
public String readString() throws
rows InvalidUserInputException
if(readToken() == tokenizer.TT_WORD || ttype ==
ype == '\"' || ttype == '\'')
return tokenizer.sval;
else
throw new InvalidUserInputException("
eption(" readString() failed. ..... Input data is not
a string");
// Method to read an int value
public int readInt() throws
InvalidUserInputException
if (readToken() != tokenizer.TT_NUMBER)
throw new InvalidUserInputException(" readInt()
nt() failed. " + " input data not numeric");
else
return (int)tokenizer.nval; // value is numeric
eric so return as int
//helper method to read the next token
private int readToken()
try
ttype = tokenizer.nextToken();
return ttype;
catch(IOException e)
e.printStackTrace(System.err);
System.exit(1);
return 0;
//object to tokenize input from the standard
andard input stream
private StreamTokenizer tokenizer = new
= new StreamTokenizer(
new
new
new
new BufferedReader(
new
new
new
new
new
new
new
new InputStreamReader(System.in)));
private int ttype; //stores
stores the token type code
=======================================================
==============
import java.io.StreamTokenizer;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
public class InvalidUserInputException extends
Exception
public InvalidUserInputException() { }
public InvalidUserInputException(String
tring message)
super(message); -
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but again...don't see it.
Can some of you please look with fresher eyes (and a more
open mind) and see if you can see this error?
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AlecYou wrote:
"images are by and large worthless in the real world unless they are printed in some fashion which requires inches"
Yes, but that does not mean that images on your computer (your hard drive) have a dimension in inches. The size in inches is determined on output for printing and varies according to the resolution that you choose for the print. For instance if you have an image with a pixel size of 2000 x 3000 pixels - if you print it at a resolution of 300 ppi / dpi the image size in inches will be 6.66" x 10". If you print it with a resolutin of 200 ppi / dpi the size in inches will be 10" x 15"; and if you print it with a resolution of 100 ppi / dpi the size will be 20" x 30". Of course, a print resolution of 100 ppi / dpi is only theoretical, because the quality of the print will be awful, and if you want to print an image of 2000 x 3000 ppi in a size of 20' x 30' you have to upsample (enlarge) it first.
So size of an image in inches is detyermind by the formula: pixel amount / resolution in ppi/dpi.
ppi = pixels per inch - ppi is used when we talk about an image on screen
dpi = dots per inch - dpi is used when we talk about print output.
You also wrote:
"LR printing is fine for snapshots but insufficient for printing from large format printers for fine art."
Why, do you say that? Printing from LR is not substantially different than printing from Photoshop. LR gives you the same printing options as does Photoshop.
I suggest you have a second look at the Print Module in LR.
WW
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