Fix Dimensions Of JPanel

Aug 27, 2014

I'm trying to fix the length of expenses to a appropriate size on my Jpanel but not sure how.

package mybudgetapp;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

[code]....

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Using Double Dimensions Strings And Methods

Apr 17, 2015

i have to use a if loop. I just started using methods and loops..You have been hired as a software developer for Canada’s customs - Toronto Pearson International Airport. Your job is to develop part of the Canada Passport System. The Database Administrator has forwarded to you the database for all the Canadians. For simplicity, assume you only have five records (i.e., only five people on file). These fixed records are the following:

First name, Last name, SIN, Last Date of Entry to Canada, Number of Entries
Mike beee 4567 12-12-1999 7
Jessie weree 4444 07-07-2007 1
Liza veee 2121 05-05-2013 2
Zico qeeee 2444 Never left the country 0

the two dimensional array stores all the values. In addition, all these values should be of type String.The Canadian officer can always see the following four choices:

1) Show custom’s database,
2)Update custom’s database,
3) A summary of a passenger’s record, and
4) Exit.

Choice 1 : always allows the officer to see all the database records (i.e., the five records). Each of these records consists of the following: First Name, Last Name, SIN, Last Date of Entry to Canada, and the Number of Entries (i.e., see the above stored values).

Choice 2 : allows the officer to update the database whenever one of the five Canadian passengers arrives. Once the officer chooses this option, the system will ask him/her for the SIN of the passenger. Then the system will ask for today’s date (i.e., the recent entry date). The system will then reflect those changes on the console screen and the number of entries will be increased by one.

Choice 3: summarizes the record for one passenger where his/her first and last names and last date of entry to Canada will be shown. The last date of entry should only have the last four digits (i.e., only the year). To extract those digits, you should use the String’s method(s). However,before a record is summarized, the records of all Canadians should be shown on the screen in order to allow the officer to choose among those records. Choice 4 allows the officer to exit from the system completely; otherwise the list of choices should be always shown on his/her monitor.This is the code i have so far.

import java.util.Scanner;
public class QuestionFive{
public static void main(String[] args) {

double passportInput;
Scanner sc = new Scanner(System.in);
// public static int generalList() // to show the list of choices and return the chosen option
//
// public static void updateRecords(int recordSize, String[][] passportDataBase) //to update the records
//

[code]....

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Layout Managers - Matrix Of Buttons At The Dimensions Of Panel

Oct 4, 2014

I have read the API and looked at examples but its not answering my question. Which layout would treat a panel as its own entity. Meaning if I made a method that made a matrix of buttons using GridLayout and returned that panel. Then called the method onto a frame and the buttons would not spread out all over the frame. They would simply stop at the dimensions of the panel. Am I looking for something that is not possible?

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Java Program To Test Circle Dimensions To Prove Pie

Apr 28, 2015

So in trying to create a circle class, and use the dimensions of that circle (radius, area, etc.) to prove it will equal pie and print (3.141592653589793). This is my code so far it and am getting an error in the last two classes. I know it has to do with Circle(Radius); in the 2nd class but whenever i call upon it, it is assigned to itself. And in the last class im not too sure how to put the B= new b(1,1).

[public class Circle {
private double radius;
public Circle() {
radius = 0;
}
public Circle(double radius) {
this.radius = radius;

[Code] .....

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Loading JPanel From Another JPanel When Button Is Pressed

Jun 9, 2014

I am making a game in java and i want to make a title screen. What I am trying to do is make a jpanel and load another jpanel when a button is pressed in one of the japenls. Here is the code for the runner

import java.awt.BorderLayout;
import javax.swing.JFrame;
public class Runner extends JFrame {
// Have these set up so they can be seen everywhere
public static final int GAMEWIDTH = 540;
public static final int GAMEHEIGHT = 710;
static boolean loading = false;

[Code] ....

here is the code for the jpanel that loads the other jpanel

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;

[Code] ...

How do load a jpanel when a button is pressed in another jpanel

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Java Number Spiral - Creating 2D Array With Given Input Of Dimensions Of Array

Aug 3, 2014

I am working on a problem where i have to create a 2d array with given input of the dimensions (odd number) of array, along with a number within the array and to then print out all of the numbers surrounding that number.

Anyway, i am working on simply making the spiral, which should look like the one below.

n = 3

7 8 9
6 1 2
5 4 3

where the 1 always starts in the center with the 2 going to the right, 3 down, then left etc. etc. I was able to create the code by starting on the outer edges rather than the center and working my way to the middle, however my code always starts from the top left and goes around to the center where it needs to start from the top right. I am having trouble altering my code to meet this criteria. This is what i have thus far.

import java.io.*;
public class Spiral
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the number of elements : ");
int n=Integer.parseInt(br.readLine());

[Code] .....

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NullPointerException Adding JPanel To JPanel

Jun 17, 2014

I have a Main() class that extends JPanel and I'm trying to add Card() that also extends JPanel.When I add a Card() or Main() object to the JFrame directly, it works fine. The problem arises when I try to add a Card() object to the Main() object.

I edited the code a little bit to make it easier to read so hopefully it's fine.

Main() code:
public class Main extends JPanel implements Runnable {
// HARDCODED OPTIONS
public static final int WIN_WIDTH = 1200;
public static final int WIN_HEIGHT = 800;

public static final int GRID_X = 9;
public static final int GRID_Y = 5;

[Code] ...

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How To Get JPanel To Refresh

Mar 18, 2015

I have tried to get my JPanel to refresh and show a new combo box, labels and fields but I can't get it working with revalidate or repaint.

package Part4; 
import javax.swing.*;
 import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 public class AddressGUI extends JFrame implements ActionListener{
 Address address = new Address();

[code]...

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How To Add Image In JPanel

Mar 18, 2015

how do i add image in JPanel

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Second JPanel Not Working

Oct 14, 2014

I code a program using Eclipse Keppler with Java 8.0. I made a program with 2 JPanel. The first JPanel is working well. From a button in first JPanel, I excute second JPanel, but It is not working. No error when I compile the code. Here is, I attached the source code.

import javax.swing.*;
import java.awt.Color;
import java.awt.event.*;

[code]....

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JPanel Won't Show

May 8, 2015

I want my program to show 1st panel and when a person press image label 2nd panel showup which will have 2 tabs "oneway" and "round trip". But rightnow I only see 2nd panel with only 1 tab and don't see 1st panel at all.

import java.awt.*;
import static java.awt.Font.BOLD;
import java.awt.event.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import java.util.Calendar;
import java.util.GregorianCalendar;
import javax.swing.*;
import javax.swing.Timer;
import javax.swing.border.*;
import javax.swing.event.*;

[code]....

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Can't Draw Very Far In A JPanel

Apr 16, 2015

I have a JPanel embedded in a JScrollPane. I draw in the JPanel, using the paint() method. I have to draw some shapes that can go far in the y direction, that's why I put my JPanel in a scroll pane, in order to scroll down to be able to discover the shapes down. But even though I put my JPanel in a JScrollPane, it soon blocks in the y direction and does not show the shapes far in the y direction.

Note: I used a GridBagConstraints which is correctly set, with its fill attribute etc.

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How To Add JScrollPane Into JPanel

Jan 16, 2015

As you can see in the above image. I have create One jFrame inside it their is one jPanel. Inside jPanel their are dynamic buttons whose range can change. (its like text box if you add more text scroll bar will appear)
 
I want to add jScrollBarr/jScollPane to jPanel so that when more than 6buttons will be their, I can scroll it down/up. So my question is how should I place jScollPane using this DRAG-DROP tool. When i clicked on jScrollPane and tried to put it inside jPanel I am unable to set it's position. It's my first time to add jScrollPane for jPanel inside jFrame.

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JPanel Buttons Not Showing Up?

Feb 21, 2015

In my if statement on line 46 & 47 im trying to add the buttons to the screen if the player has lost and the "game over" screen have popped up. But the buttons aren't showing... what am i doing wrong?

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

[code]...

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JButtons Not Appearing In JPanel

Apr 17, 2014

I want to add a "play" and a "stop" button to stop and play a sound file. Sound file works good, but buttons aren't appearing in the window.

public class SpelaLjud extends JPanel implements ActionListener {
JButton bPlay, bStop;
AudioClip ac;
public SpelaLjud() {
bPlay = new JButton ("PLAY");
bStop = new JButton ("STOP");
add(bPlay);
add(bStop);
bPlay.addActionListener(this);
bStop.addActionListener(this);

[code]....

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JPanel Is Not Displaying All The Time

Jul 2, 2014

Yes my JPanel is not displaying all the time like you would think it would. Before you beat me up yes I am a bit new I am just working on the GUI part of java over my summer break. Obviously it is not suppose to do that. Secondly, As you can see i am using the alphabet to create JButtons. Shouldnt there be an easier way to use a for( loop) . I tried before but I didn't want to get too side tracked.

Java Code:

import javax.swing.*;
import java.awt.*;
public class hello {
private JFrame alphaframe1;
private JFrame alphaframe2;

[Code] .....

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Order Buttons In A JPanel

Sep 22, 2014

I'm learning the swing options of Java, and my first exercise was the typical Chat Room. I got everything right: TextField, TextArea, the jpanel at left side and the buttons inside of it. BUT I can't order the 2 buttons (1 north, 1 south). I've already looked for answers, but didn't find anything and I tried to asked the teacher, but she was too lazy to look for the error. Here is my code:

f=new JFrame("Chat Room");
b1=new JButton("Send");
b2=new JButton("Emoticons");
public void showWindow(){
p1=new JPanel();
f.getContentPane().add(p1,BorderLayout.EAST);
p1.add(b1,BorderLayout.NORTH);
p1.add(b2,BorderLayout.SOUTH);
}

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How To Create Insets For JPanel

May 6, 2014

Is there a way to create insets for the JPanel without using the GridBagLayout, or createEmptyBorder() because the panel already wants to have an etched border?

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Adding Object To JPanel

Nov 28, 2014

I am making a graph to implement Breadth First Search and Depth First Search. I changed the program because I want each button to be its own node. However I am having an issue placing them into a panel. When I run the program I get the following error:

The method add (Component) in the type Container is not applicable for the arguments (Buttons)

JPanel matrixPan(){
Buttons[][] matrixBtn = new Buttons[25][25];
JPanel panel = new JPanel();
panel.setSize(550,550);
panel.setLayout(new GridLayout(25,25));

[Code] .....

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How To Move JLabel In JPanel

Jan 9, 2014

I am trying to move a JLabel in a JPanel, but can't seem to make it work. I can't provide a compiling code, but a few fragments. I have a JLabel [] array. i want to move with the mouse elements of this array. Let's say i want to move JLabel[i]. I implemented this:

Java Code:

static int labelY;
static Point labelX;
static Boolean flag = false;
jLabel[i].addMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent evt){
labelY=evt.getY();

[Code]...

I used the bool flag because i can't make changes to the label when it is inside an anonymous class. I also tried using setLocation but that did not work also. I don't get any errors when compiling. But when i run it and try to drag the JLabel[i] i get a long list of errors:

Java Code:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at puzzle.hw$1$2.mouseDragged(hw.java:276)
at java.awt.Component.processMouseMotionEvent(Unknown Source)
at javax.swing.JComponent.processMouseMotionEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)

[Code]...

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Way To Rotate JPanel In Java

Jul 28, 2014

Is there any way to Rotate jPanel in java (without using Paint Function).

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JPanel Appears To Be Null

Feb 23, 2014

I've a JPanel declared as a field in a JFrame:

public static javax.swing.JPanel pane;
I initialize it in a method (Well, Netbeans' GUI builder does. :P)
pane = new javax.swing.JPanel(){
@Override
public void paint(Graphics g){
g.setColor(Color.BLACK);
g.drawArc(8, 6, 15, 15, 0, 90); /* This works. The panel and frame are displayed, the arc is drawn, &c. */
}
};

it works and all; the arc is drawn.I want to draw on it dynamically by instantiating its Graphics (I call the "public Graphics getGraphics()" method.). This has worked for me before, taking a JPanel's Graphics and drawing with it through a different method than public void paint(Graphics g); But when I do, it comes up with a NullPointerException. WAIT! Don't go rambling on about initializing the variable because I've gotten past that NPE newbie's blockade.public static void render(Something s) { /*This is in a different file altogether. pane is public, static so I can access it from here. That's not the problem.*/

JPanel jp = Frame.pane;
Graphics g = jp.getGraphics();
g.fillRect(s.x, s.y, 4, 4);
}

Upon further investigation:
Exception in thread "main" java.lang.NullPointerException
at physics.Renderer.render(Renderer.java:30) <-- This line is "JPanel jp = Frame.pane;"
at physics.Renderer.renderall(Renderer.java:24) <--This line calls public static void render(Something s)
at physics.Updater.update(Updater.java:47) <--Renderer is just a tool used by the Updater. Sounds like a game loop, right?
at physics.Physics.main(Physics.java:31) <-- The game loop.

it says that Line 30, making jp and pointing it to pane itself is the problem.

Conclusion:
-The JPanel in the JFrame is created, initialized and overrides a parent method.
-The JPanel is not initialized, meaning that it is null. There is obviously a problem.

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Opening Image In JPanel

Dec 18, 2014

I've been working on this code since a couple days and I just can't find what's wrong here. I have make an image open when the JMenu m6 button is clicked but it just doesn't work. I've tried a bunch of different codes but when I click on the desired button, nothing happens. Here's the code :

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;

[code]...

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How To Use Images As Backgrounds For JPanel

May 20, 2014

I am trying to use images as my backgrounds for my JPanel.the problem is when I run the program the images don't show at first.T hey start to show after I have switched to another panel and then switch back. Here are my codes

//for loading image
static public Image LoadIcon(String file) {
URL icoURL = windows.class.getResource(file);
Image img = Toolkit.getDefaultToolkit().createImage(icoURL);
return img;

[Code] ......

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Display Image (GIF / JPG) On JPanel

Apr 12, 2014

I'm simply trying to make a gui for managing images for my purpose, but i fall at the first step: I'm actually not able to display an image, whether it would be a .gif or .jpg ....

//--------MY PANEL FOR VIEWING IMAGE---------
package graph2D;
 
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import javax.swing.JPanel;
class PannelloConImmagine extends JPanel {
private Image miaImmagine;
 
[Code] .....

it is supposed that i placed the image "pippo.gif" in my project "src" folder, isn't it? anyway I tried to add a new folder to my build Path, and place pippo.gif on it, but it doesn't work.

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Print JPanel Or Convert To PDF

Apr 24, 2014

How to print a jpanel contents or is there any tool that can save the jpanel contents in pdf. I have tired using

jpanel.printall();

But that not working that gives an error as

java code : -1074232

Something like that

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