I have the following code:
<% String callImp = null;
callImp = request.getParameter("callImp");
System.out.println("Call Importer: " + callImp)
if (callImp == null){
System.out.println("Aici null");
%>
and i have an [url] ....
Why is getParameter always returning null?
I would use the return value of a function how parameter of other function..In java is:
// the call produce "YES"
SecondClassController.funcSecondClass(FirstClassController.funcFirstClass());
In my web page I need to do something like this:
[...]
<h:outputText value="#{secondClassController.funcSecondClass(#{firstClassController.funcFirstClass()})}" />
[...]
obtain:
javax.servlet.ServletException JBWEB006007: Failed to parse the expression
@Named
@SessionScoped
public class FirstClassController implements Serializable{
[...]
[code]....
so i followed a tutorial on youtube called "Java Game Development with Slick" - by thenewboston,URL....okay, so i have made my game / program, and now i just want to export it to a jar file that people can double click and play..unfortunately when i double click the .jar file nothing happens...i get the little "loading" thingy on my courser but it disappears after about 5 seconds and then nothing happens :(the way i made it into a jar file is by doing the following:
-right clicked my java project..
-clicked on "export"..
-clicked on java / Runnable JAR file
-filled in the stuff, (JARs destination ect..)
-pressed finish..
-then i got a jar file on my desktop and double clicked it....but as i said....nothing happens
Since I done a recent git pull on my project, for some reason now Im getting an error when starting Tomcat and rendering the index.jsp, but I dont understand whats changed, as this was working before.
The error:
org.apache.jasper.JasperException: /index.jsp (line: 4, column: 42) File "/blog.postTags" not found
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:133)
org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:168)
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:410)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:475)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1427)
The index.jsp:
<!DOCTYPE html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="p" uri="blog.postTags" %>
<html>
<head><title>Blog Home</title></head>
<body>
<h1>Blog Home</h1>
<br />
<% out.println("Your IP address is " + request.getRemoteAddr()); %>
[code]....
I really am unsure as to why this has stopped working, I even rolled back to an earlier commit and this was definitely working before, but I havent changed anything, Initially when you start Tomcat is shows another error in the browser, but on a refresh its a null on this tag library?
Write a program that asks the user for the low and high integer in a range of integers. The program then asks the user for integers to be added up. The program computes two sums:
The sum of integers that are in the range (inclusive), and the sum of integers that are outside of the range. The user signals the end of input with a 0.
Your output should look like this:
Sample input/output
In-range Adder Low end of range: 20
High end of range: 50
Enter data: 21
Enter data: 60
Enter data: 49
Enter data: 30
Enter data: 91
Enter data: 0
Sum of in range values: 100
Sum of out of range values: 151
This is my assignment and below is my code.
import java.util.Scanner;
class InRangeAdder {
public static void main(String[] args) {
Scanner scan = new Scanner (System.in);
int low, high, data=1, rangesum=0, outrangesum=0;
[Code] ....
The problem is that the program simply gives an output of 0 for both "rangesum" and "outrangesum". I don't quite understand why that is. Also i have a quick question, the program needs me to end the program when the value of data is 0 but in order to initialize it I need to give it a value. Usually I would give it a value of 0 like I have for rangesum and outrangesum but if I do the program does not run till the loop as it considers the value of data to be 0 and ends the program right away. What would be a work around to this and when do I need to have a value to initialize an integer? for example, I do not need a value for low and high. Is this because the program recognizes that a value is going to be defined but cannot do that for the other integers as they are inside a loop?
if(false){}
but this is not
for(;false;){}
both will in theory never go in more interestingly this will compile
for(;false == false;){}
To me it seems like this is a parsing issue that could have been solved by the people who originally wrote the parser but they made a decision that there must be a relational operator in the condition declaration.
why this code, doesn't display the image?
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
[code]...
I'm trying to open an image within a JFrame but the image doesn't show. The directory path is correct. The JFrame opens perfectly but no image is showing.
JFrame frame = new JFrame("IMAGE");
frame.setSize(500,500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ImageIcon image = new ImageIcon("images/main.jpg");
JLabel label = new JLabel("", image, JLabel.CENTER);
JPanel panel = new JPanel(new BorderLayout());
panel.add( label, BorderLayout.CENTER );
frame.setVisible(true);
In fact, I'm not yet past that "Hello World" program.I'm following the steps in "Head First: Java" book, and reached that point where one is ready to write his/her 1st Java code. Here's mine:
public class MyFirstApp
{
public static void main (String[] args)
{
System.out.println("I Rule!");
System.out.println("The World!");
}
}
As simple as it should be, and compiles fine producing the correspondent class. But it doesn't run, however, and spits the following execution-time errors:
Exception in thread "main" java.lang.UnsupportedClassVersionError: MyFirstApp : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
[code]...
I am trying to present the user with a response of 'correct' or 'incorrect'. I do the following, but mResultTextView never updates.
mResultTextView.setText("Correct");
android.os.SystemClock.sleep(1000);
I think the problem is that my view needs to be re-drawn.
package com.example.quiz;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;
import android.graphics.Color;
[code]...
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class frmSearch extends JDialog
{
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
JPanel jpnlMain = new JPanel();
[Code] ....
Is there a short term that means: "using an object reference with the datatype of a supertype to refer to an object with the datatype of a subtype"?
Saying "polymorphic reference" doesn't seem to be specific enough because ALL references other than those with the Object datatype are polymorphic. I saw one post that referred to these reference variables as a "supertype reference." In the absence of any other (more official) term, I may just use that term because calling a reference a "supertype reference" implies that there is a subtype. It sure beats what I was thinking about using: "sub-as-super." Which, when the inevitable mispronunciations occur, would lead to all kinds of off-color jokes.
Is there an "official" term that all of the dozens of Java books I have read seem to have missed? Or does everyone stumble along, spelling things out with a nearly sentence-long phrase.
Barbara is opening a book store, and she needs an effective, efficient, object-oriented program to keep track of her inventory. Barbara would like to maintain the following information about the books she sells: title, author, price, number in stock, and category. She categorizes her books into fiction, nonfiction and children’s books, because she has a separate room in her store for each category. Each book also needs an inventory number, and Barbara would like these numbers to start with 1000. She also needs to be able to keep track of the total number of books in inventory.
Barbara often facilitate her customers find books, and the program needs search capabilities to do this. Keeping an accurate inventory count of each book in stock is critical; both for accounting purposes and so she will know when to reorder. Barbara expects to have at most 2,000 differet books in her store.Barbara is very organized, and would like a nice menu, from which she can make choices that will enable her to do the following:
Add a new book to inventory
This adds a new Book object (title, author, etc) into inventory
It does not increase the number in stock of an existing book
Search by title
Search by author
Search by inventory number
Search by category
Print out all info for all books
This is the only output that should be on the command line
Please hard code the following book info into your program, so Barbara has some test data avaiable to test your program:
title: Crime and Punishment; author: Dostoevsky; price: 39.95; number in stock: 5; category: fiction
title: Brothers Karamazov; author: Dostoevsky; price 34.50; number in stock: 3; category: fiction
title: Java; author: Liang; price: 59.29; number in stock: 12; category: non-fiction
title: Java, author: Horstmann; price: 14.33; number in stock: 4; category: non-fiction
title: The Lion, the Witch and the Wardrobe; author: Lewis; price: 12.50; number in stock: 3; category: childrens
Here is my code so far. The first one is the "Blueprint" and the second one is the main.
public class Book
{
private String title;
private String author;
private double price;
private int stockNumber;
private String category;
private int inventoryNumber =1000;
private static int numberOfBooks = 0;
public Book(String theTitle, String theAuthor, double thePrice, int theStockNumber, String theCategory)
[code]....
When a JTextArea is created in a JScrollPane and the contents of the JTextArea change, the JScrollPane's preferred size doesn't change.
In the following code, I create a JScrollPane and a JTextArea as a client. I then, add contents to the JTextArea and call revalidate() on it to let the JScrollPane re-update itself. However, it keeps reporting the same preferred size.
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class c
{
static JScrollPane sp;
static JTextArea ta;
public static void main (String...args)
[Code] ....
I have a practice exercise here wherein I will add a JOptionPane to a program. When the close button is clicked, the JOptionPane will appear asking the user to exit the program. If the user clicks "Yes," it'll, of course, close the entire program and not just the JOptionPane, but if the user clicks "No," it will return to the program. Please refer to my code below:
try
{
output = new DataOutputStream(new FileOutputStream("ProjSixExe4.dat"));
}
catch(IOException ex) {
this.dispatchEvent(new WindowEvent(this, WindowEvent.WINDOW_CLOSING))
}
final JOptionPane optionpane = new JOptionPane("Are you sure you want to quit
this program?", JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_OPTION);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
The exercise said it must be placed before the EXIT_ON_CLOSE portion.
sale s = new sale();
jDesktopPane1.add(s);
s.show();
says not a suitable method?
why overridden doesn't apply to variables. However, instance variables are stored inside the object.I ran below program and expected to print "two" but it gets printed "one".
class SupCont {
String s = "one";
}
class Cont extends SupCont {
public static void main(String a[]) {
String s = "two";
SupCont c = new Cont();
System.out.println(c.s);
}
}
I have a frame showing some textfields and a couple of buttons, the classical "Ok" and "Reset" buttons, which are supposed to confirm the values of the textfields (closing the frame) and reset them respectively.
I think I thoroughly followed the "delegation method procedure" for managing event, that is , create the button object, define a listener class (implementing the ActionListener interface) , and add the listener class to the button using the "addActionListener" method . But there's no way to make the whole thing work.
No exception. Only when I click the button the "actionPerformed" method of the listener is simply ignored, as if it didn't exist.
Here is the code :
public FrameViewAddEstrazione (String ExtrPath) {
try
{
FilePath = ExtrPath;
F = new JFrame ();
PP = new JPanel();
PD = new JPanel(); // pannello data
[Code] ....
import com.googlecode.javacpp.Loader;
import com.googlecode.javacv.*;
import com.googlecode.javacv.cpp.*;
import com.googlecode.javacv.cpp.opencv_core.CvMemStorage;
import com.googlecode.javacv.cpp.opencv_core.CvPoint;
import com.googlecode.javacv.cpp.opencv_core.CvScalar;
import com.googlecode.javacv.cpp.opencv_core.CvSeq;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
import com.googlecode.javacv.cpp.opencv_highgui.CvCapture;
import com.googlecode.javacv.cpp.opencv_imgproc.CvMoments;
[code]....
Everything works in this except the part where drawing a convexhull and the convexitydefects around an object. Drawing circle around the COG works OK. I tried to draw them with these lines but no luck.
hullSeq = cvConvexHull2(bigContour, hullStorage, CV_COUNTER_CLOCKWISE, 0);
defects = cvConvexityDefects(bigContour, hullSeq, defectsStorage);
cvDrawContours(img1,defects , CvScalar.BLUE, CvScalar.BLUE, 1,0,0);
cvDrawContours(img1,hullSeq , CvScalar.BLUE, CvScalar.BLUE, 1,0,0);
I have a 2d array that i am manipulating. In my class i have a constructor that takes the dimensions of the array and within th econstructor i need to randomly fill the array. However, when i try to manipulate it in the test program, all that prints out are the default values.
here is the class
import java.util.*;
import java.lang.Math;
import java.util.Arrays;
import java.util.Random;
class SummerStats
[Code] .....
And here is the printout
Enter number of rows(people):
3
Enter number of columns(years):
3
Enter number of person to find sum salary:
1
Enter year to find Max salary of that year:
1
[]
[]
The max salary is at index: (0, 0, )
The largest salary ocurred in year: 0
The sum of person 1 is: 0.0
The total of all salaries is: $0.0
The max salary in year 1 is: 0.0
The average salaries for each year:
0.0, 0.0, 0.0,
The total salary for each person is recorded below.
And the last method called doesn't finish or printout ie the program doesnt end
Why the keyTyped function isn't triggered, when i type a key?
Here is my code:
package main;
import java.awt.Component;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
[Code] .....
I have noticed, that if i call setVisible(true) before i add the button, then it works, but the button is not displayed... How can i achieve that the button is displays AND the KeyListener works?
I would like to create a program that takes some files and modifies them in this way: The files should contain text formatted in this way:
##############
#various comments#
##############
something{
identifier=1234
anotherIdentifier=1235
anotherOne=12345
//and so on...
}//I need only this
#Comments are sometimes made this way
somethingAgain{
#comments that explains what's below them
I:dentifier:something, I, do, not, need
#see ^that
A:notherIdentifier:boolean
//and so on..
}
And I have to make so that the numbers contained in something{} in all the files don't match. I could ask to make so that the input file is only one, and it is formatted this way:
identifier=1234
anotherIdentifier=1235
anotherOne=12345
//and so on...
but I don't know how to do the rest of the program... That's what I've done (the names of the classes, package etc. are in Italian and there's some useless code that NetBeans prevents me from deleting):
package confronto;
import java.awt.Color;
import java.io.*;
import javax.swing.*;
public class confrontoTesti extends javax.swing.JFrame {
[Code] ....
I have a main class that hold the frame and paints, a class for drawing my game, and an image that is drawn too.
I want to count the amount of times I click on this "android" (right now it counts if i click the screen) but the text from the class Game doesn't update.
androidX = Main.width - android.getWidth();
doesn't work. In my head the image should be inside the borders but it isn't. Have I calculated the pixels wrong or am I missing something?
public class Main extends JPanel{
public static final int width = 600;
public static final int height = 600;
Game game = new Game();
Android android = new Android();
public void paint(Graphics g) {
super.paint(g);
game.render(g);
android.render(g);
[code]....
I have two files - I can get the second one to populate with the first ones data and then delete the first one. I cannot get it to then rename itself to the name of the first file. It also only hits the 'rename' section of the code providing I place system.gc in otherwise it completely skips it.
the code I use is below:
Java Code:
finally{
try {
br.close();
// mp br.close();
//mp System.gc();
[code]...
I compiled the applet, then put the applet in an HTML file using notepad and saved the html file in the right place for it to run correctly. The HTML file runs smoothly, but then it only shows the scrollbar part of my applet, and not the images or any text...
Why is This?????
Java Code:
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
import javax.swing.ImageIcon;
public class Temperature_Convert extends Applet
implements AdjustmentListener {
private Image temp;
private Scrollbar bar;
private int old, newtemp = 0;
[code]....
int arabe = Integer.readLine(args[0]);
String romain= "";
The compilator says that it can't find symbol. The arrow is under the "".""
It worked before.