Applets :: Initial Painting - Content Overlap?
Feb 10, 2014
I have 4 small applets on a page that simply prints out the quadratic equation for values passed in. There are 4 applets on a page that have different values assigned. They display fine.... sometimes.... if I refresh or generate new numbers sometimes one applet looks as though it has numbers overlapping the new values. If I resize or drag the browser everything displays fine again - no need to refresh the browser or anything. It's as though old values or something are being overwritten by the new or something similar is happening. What should I include in the paint method of the JPanel that might clear the applet before initial painting happens..... if anything?
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Oct 27, 2014
the thing with this program is that instead of it having preset variables, I want to prompt the user to enter values of the two rectangles. I don't know how to use the scanner in this case, or even if I should use the scanner.
class MyRectangle2D {
//declare the variables
private double x, y;
private double width, height;
[code]...
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May 1, 2015
Write a program that draws 20 circles, with the radius and location of each circle determined at random...... Two circles overlap if the distance between their center points is less than the sum of their radii...
There may be many problems with the code in general but what I'm struggling with is the distance and the totalradius portion. Visually, its inaccurate.
import java.awt.*;
import javax.swing.*;
public class CircleTest extends JPanel {
Circle []circles;
Circle []circleCenter;
Circle []all;
private int distance, totalradius, dx, dy;
private int radius,x,y;
[Code] ....
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Oct 20, 2014
I am new to Java, programming, and intelliJ. I am trying to make a BMI Calculator using this code as my initial template which converts Fahrenheit to Celsius.
import javax.swing.JFrame;
public class Fahrenheit
{
//-----------------------------------------------------------------
// Creates and displays the temperature converter GUI.
//-----------------------------------------------------------------
[code]....
I created a local field within BMIButtonListener for weight, height, resultLabel, and was able to compile but it did not calculate and listed exceptions.
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Feb 16, 2015
I created my own class and it basically randomizes the amount of 'spells' [magic] a user uses (range 1-5). I can't figure out how to increment the initial randomized output to make something like this :
User X : uses 2 spell.
User Y : uses 3 spells.
User X : uses 3 spells. (Taking the randomized 2 and increment by 1)
User Y : uses 4 spells. (Taking the randomized 3 and increment by 1)
My current setup looks like this : First one is the class I created and the second one is just how the output would look like. (seperate by +++++...)
My goal is to create a METHOD to increment it.
public class Spell {
// Max number of spells
private final int MAX_FACE_VALUE = 5;
// Current face value
private int faceValue;
// New instance of Spell
public Spell() {
faceValue = 1;
[Code] ....
+++++++++++++++++++++++++++++++++
public class SpellOutput {
public static void main(String[] args) {
//Object creation
Spell spellCasterOne = new Spell();
Spell spellCasterTwo = new Spell();
Spell spellCasterThree = new Spell();
[code] ....
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Oct 10, 2014
I am having an issue with using FileWriter to print some text to a text file. In the following code, I am supposed to be able to print the initial attributes and the user changed inputs into a file but all I am getting is the memory locations of the objects I created in one long line.
package project3final;
import java.io.*;
import java.util.*;
public class Project3Final {
static class Instrument {
char [] stringNames = {'E', 'A', 'D', 'G', 'B', 'E'};
private final String instrumentName;
[Code] .....
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Jul 14, 2014
I want to make a simple Table Tennis game. I have 2 drawing classes. 1st should draw oval and 2nd rectangle. But second class, which should draw rectangle doesn't work and if i use it together with oval class, then oval doesn't appear too.
Java Code:
public static void main(String[] args) throws InterruptedException
{
Intro i = new Intro();
Pall pall = new Pall();
Laud laud = new Laud();
i.frameID().add(pall); // this adds oval
i.frameID().add(laud); // this adds rectangle
i.frameID().pack();
i.frameID().setSize(400, 400);
[code]...
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May 13, 2014
I am attempting to make some Java2D shapes by wrapping them in subclasses of JComponent and giving them functionality. Unfortunately after defining paintComponent and adding it to the JPanel the shape is not showing up. As in my last thread the code is mostly irrelevant but the perhaps worth a skim. The only methods truely relevant are the paintComponent method in my shape and Sandbox constructor.
Java Code:
public class Sandbox extends JPanel
{
private Timer timer;
private Circle c;
public Sandbox()
{
c = new Circle();
add(c);
setPreferredSize(new Dimension(400, 300));
[Code] ....
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Dec 10, 2014
I am currently trying to make a Tetris game, so far I've got a class drawing that extends a JPanel as my canvas, a class Square that is 1 square(20 by 20) and a class LineShape that should draw 4 squares above each other. The class Frame way below is merely to set things up.
Currently i'm able to draw objects of my class Square, so I made a class LineShape that combines both and makes a 4Square long line.
My problem is when I try to draw an object of the class LineShape, it shows nothing, removes what is already painted(the square) and gives an error message:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at LineShape.<init>(Screen.java:96)
at Drawing.paint(Screen.java:79)
I put my classes together so you can copy paste and run, make a new screen to start, to see the problem occur, go to the drawing class's paint method and uncomment these lines:
// LineShape shape = new LineShape(this);
// shape.paint(g);
Below are my classes:
import javax.swing.*;
import java.awt.*;
public class Screen {
private Frame frame;
private Frame inputFrame;
private JPanel panel;
[Code] ....
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Apr 1, 2014
I have in my app a JTable. I would like to know how can i do to, when i click in a cell, my jtable paint the entire line of this cell. Here is what i did.
Method call:
private void jTable1MouseClicked(java.awt.event.MouseEvent evt) {
int row = jTable1.rowAtPoint( evt.getPoint() );// Don't know how to send this info through setDefaultRenderer.
jTable1.setDefaultRenderer( Object.class, new RowRender() );
[Code] ....
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Feb 12, 2015
public void actionPerformed(ActionEvent e)
{
myBuffer.setColor(BACKGROUND);
myBuffer.fillRect(0, 0, WIDTH, HEIGHT);
myBuffer.setColor(Color.red);
for(int x = 17; x < WIDTH; x += 30) //vertical lines
[Code] ....
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Aug 11, 2014
I keep hearing these two term when it comes to painting in Swing, however, I'm not sure which is which. To my understanding is that the child components are the ones that already exist on screen (could be a JButton, JFrame, or custom painting) . and the parent components are the one to be added/drawn next. (hence, if we override the paintChildren() method when painting, the components that were already on the screen don't appear any more) ....
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Apr 17, 2014
Pretty much the title. Everything was running fine until a moment, when pain updated only once after the first resize. I've seen some worries about th.start(); or repaint(); but I did not manage to track the problem down since I'm a rookie at programming. Here's the Main class.
import java.applet.*;
import java.awt.*;
public class Main extends Applet implements Runnable
{
// variables
Thread th;
Player player;
static Shot [] shots;
[Code] ....
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Dec 26, 2013
I am new to applets, and my manifest file is:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.3
Permissions: all-permissions
Created-By: 1.6.0-internal (Sun Microsystems Inc.)
Name: com/myPackage/test/client/TaskApplet.class
SHA1-Digest: pLmraui35IkgfAq+v3WGj1LwCYQ=
The error I get is as follows...When the page is loaded I get the following error: java.lang.SecurityException: class "com.myPackage. test.client. TaskApplet" does not match trust level of other classes in the same package
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Jan 30, 2015
I need to create a code for this asign:
Write a program that computes the cost of painting and installing carpet in a room. Assume that the room has one door, two windows, and one bookshelf. Your program must do the following:a. Prompts the user to enter, in feet, the length, width, and height of a room.
A. Read the dimensions of the room.
b. Prompts the user to enter the width and heights, in feet, of the door, each window, and the bookshelf. Read these quantities.
c. Prompts the user to enter the cost, per square foot, of painting the walls. Read these quantities.
d. Prompts the user to enter of cost, per square foot, of installing carpet. Read these quantities.
e. Output the cost of painting the walls and installing the carpet.
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Mar 16, 2015
HTML Code:
import java.util.Scanner;
public class BellmanFord {
private int distances[];
private int numberofvertices;
public static final int MAX_VALUE = 999;
[Code] ....
I am trying to display two types of table one with initial cost and another one with new cost. Based on the java code here i already have one table but don't know how to display another table.
Attached is the sample output that i am aiming for. The output table for the above code is:
Enter the number of vertices
6
Enter the adjacency matrix
0 4 0 0 -1 0
0 0 -1 0 -2 0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 -5 0 3
0 0 0 0 0 0
Enter the source vertex
1
distance of source 1 to 1 is 0
distance of source 1 to 2 is 4
distance of source 1 to 3 is 3
distance of source 1 to 4 is -6
distance of source 1 to 5 is -1
distance of source 1 to 6 is 2
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Sep 4, 2014
this is what I clobbered together for the O'Reilly Java 2 Course, final assignment. There may well be several issues still with this code, my main grief at the moment is: The mouseReleased does not react (it did in the assignment I lifted it from and made only minor changes). No matter where I click on the grid, nothing happens.
import java.awt.event.MouseAdapter;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.Container;
[code]....
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May 14, 2014
I do not think this is possible, but I'd like to confirm. If I have an HTML page that has an embedded Java applet, and that applet in turn renders an HTML document (within the applet window), is the HTML *within* the applet part of / accessible through the DOM for the parent page?
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Jan 31, 2014
We are using an applet in our web application. The applet of our application is dependent on bouncycastle jar,bcprov-jdk15.jar and few other jar's whose size comes around 4 mb. When using the appliaction on jre7, the applet is taking too long time to load than usual time. Is there any way to place these jar's in client machine? Will it improve the performance? Is there any other way to reduce the loading time of applet apart from placing jars in client machine?
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Feb 26, 2014
I have a simple applet that doesn't stray outside the sandbox. It used to work fine before Java 7 but now it craps out with security warnings. It does nothing but play a game, it doesn't even save the state of the game. This is the applet, it's a very simple chess program.
The warnings and popups I'm getting are:
activate javaTM platform SE 7U?allow now?activation blocked by security settings - I never changed any security settings and as I said, this applet stays firmly in the sandbox so I can't see what the issue is.Viewing the java error window I see
Java Plug-in 10.51.2.13
Using JRE version 1.7.0_51-b13 Java HotSpot(TM) Client VM
User home directory = C:UsersMike
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
[code]....
why it shows the C:UsersMike directory in the above listing, there is no access to files etc.The applet plays fine if I run it in appletviewer.What do I need to do to make this simply work in anyone's browser? I have a similar problem with a (rather funky) Connect 4 program I wrote. It worked fine for years and then just stopped with the Java 7.
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May 29, 2014
I'm developing an Applet that print a bar code using Jpos API. I need some jars and two configuration file. I've added jars to the classpath and configuration files in src directory. In Eclipse everything works fine.
DefaultProperties prop = new DefaultProperties();
prop.loadJposProperties();
SimpleXmlRegPopulator xmlReg = new SimpleXmlRegPopulator();
xmlReg.load(wincor.jpos17.THxxx.xml");
Everything works fine in Eclispe but I can't find property files when i call the applet from a web page. So I've checked the JavaPos sources and I've paste the loadJposProperties() and xmlReg.load("wincor.jpos17.THxxx.xml") content in my source code:
InputStream isD = prop.getClass().getClassLoader().getResourceAsStream(prop.JPOS_PROPERTIES_FILENAME); // (1) content of loadProperties
if (isD != null){
System.out.println("jpos/res/jpos.properties found");
[Code] ...
The same method is used to found wincor.jpos17.THxxx.xml. So when I call applet form the browser I get INPUT STREAM FROM PROPERTIES OK!! from (1) and jpos/res/jpos.properties not found from (2).
So getClass().getClassLoader().getResourceAsStream works if i write it directly in my code, but doesn't work if i call a jar method.
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Jul 17, 2014
I am currently trying to update a few java applets for a website. As of right now, the applets are automatically blocked on all computers when they are accessed because the newest updates for Java have caused them to be blocked. I have determined that the solution to this is to resign the .jar files that are used to run the application with a new certificate.
I requested and received a certificate (in pkcs 12 format, a .p12 file), imported it into the computer, and used it to sign the .jar files. However, I have been getting an error after signing the .jar files stating that the full certificate chain of the code signing certificate is not valid.
I tried to check the path of the certificate using a method he recommended (using OpenSSL) but didn't really find anything of use.
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Jul 22, 2014
I'm trying to learn how to Pause/Resume audio in an applet .
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Mar 21, 2014
This is what I ended up with and it is not what I want.
How do I convert this to an applet that would run independently on a desk top out of all these shells?
[URL]
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Jun 2, 2014
So I have an applet and in the first ScrollPane you have a number of options of businesses
The Centre
IMAX
etc ..
and when you click one , the other scrollpane shows office
so when i choose "The Centre" for example , in the right scrollpane it shows : "Head Str." "Downtown" etc
i can fill in the first scrollpane with:
void myInit() {
DefaultListModel model = (DefaultListModel)businessList.getModel();
model.removeAllElements();
try {
ArrayList<Business> bussinesses = contr.getBusiness();
[code]....
but this gives me a NullPointerException on
ArrayList<Office> offices= business.getOffices(name);
which i don't understand, since business isn't null .. it's the selected value.
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May 26, 2014
I bought a certificate to sign my jars, if a deploy my applet in a html file with out framework, just html and js, the works great, I can call from javascript all public methods from the applet. The real problem is when I try to deploy the same signed jar on a adf project in Jdeveloper. Does not work at all and java execute some warnings and later applet is block, the message say something like "exist some jars signed and not signed" But I am sure that all jars are signed...
I got this:
applet console:
image
All jars are signed, dependencies too.
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