JLabel Won't Show Until JFrame Is Resized

Dec 20, 2014

I am trying to make movingLabel move to a different JPanel each time the JButton is clicked. I can see that the random integer is changing each time the button is clicked, but the movingLabel wasn't doing anything. I noticed that if I click the button and then resize the JFrame with my mouse, it shows in the correct panel. Is there something I am missing, or is there a way to make it automatically display in the correct panel without having to manually resize the JFrame each time? I was thinking that I could add something that resizes the window slightly each time the button is clicked to show it, but I don't think that is probably the "right" way to do it.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
public class JMovingFrame extends JFrame implements ActionListener

[code]...

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JTable Elements Only Show Up When Clicked On Or JFrame Resized

Jan 18, 2015

This is an old project that I had working probably 2 years ago. Since I reopened it the only thing I have changed is the database location. This is a very basic project I did to dip my toes in to Java. I'm going to add it to my portfolio but just to clarify I am not a Java developer so this is mainly there to show that I am not completely blind when it comes to Java.

//Import libraries
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.sql.Connection;
import java.sql.DriverManager;

[Code]...

Errors when I click the button that launches the JFrame:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 6 >= 6
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableModel.getValueAt(Unknown Source)
at javax.swing.JTable.getValueAt(Unknown Source)
at javax.swing.JTable.prepareRenderer(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)

[Code]...

It will launch the window but it will be blank. If I resize the window it will show me the headers. If I click below the headers were the data should be, it will show me the data.

Since it has been so long the only thing I can think of is some of the code has become antiquated. As I said, this was working originally. I just fired it up again to take some screenshots for my portfolio.

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Apr 5, 2014

So Im making a game with a start screen followed by my game. I have a button centered but Im having a hard time displaying my label. Here's my code:

import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JFrame;
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[Code] ....

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setLayout(new BorderLayout());
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A workaround that I DO NOT want to keep doing is to put an extra fake JLabel at the end of the for loop, that way everything I want to show up does, but the fake one does not.

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I am currently trying to make a method that will enable a jLabel to be dragged across the screen. I want to be able to drag the object pretty much anywhere on the screen(I hope to eventually make a destination for it where it can be dropped but I will get to that later). I have looked on various places on the internet on how to achieve this and the most simple solution does something like this:

Java Code:

jLabel6.setText("jLabel6");
jLabel6.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
public void mouseDragged(java.awt.event.MouseEvent evt) {
jLabel6MouseMoved(evt);
}
});
private void jLabel6MouseDragged(java.awt.event.MouseEvent evt) {
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[Code]...

This actually works somewhat but it is very faulty. For example the jLabel keeps appearing and reappearing as I drag it. Furthermore when I drag it I can see a duplicate Jlabel being dragged as well in the top left hand screen. So how might I fix this?

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frame.setSize(500,500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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Java Code:

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[code]....

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Here is my image class

Java Code:

import java.awt.BorderLayout;
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import java.awt.Graphics;
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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;
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[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)

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Java Code:

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I have written a code to rotate a Jlabel but i am facing some problems.

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So Im making a game with a start screen followed by my game. I have a button centered but Im having a hard time displaying my label. Here's my code:

import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JFrame;

public class TitleScreen extends JPanel implements ActionListener{

[Code] ....

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My code is below :

import javax.swing.*;
import java.awt.*;
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/**
* Program using SWING components to create a Christmas themed Calculator.
*/
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I'm using NetBeans.

I have a JFrame with four JPanels, SensorLL, SensorLC, SensorCR and SensorRR. They are instances of the class SensorUI. Each has a JLabel called Sensor.

The class SensorUI has a method writeSensor that writes to the JLabel "Sensor". I will have four temperature sensors. I have not started the code to read the temperature sensors yet. I will have a timer that will run once a second. When it fires I will read the sensors and display the result in the

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I use MyMain to call FrameDemo and create the JFrame and a method

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I can use SensorLL.writeSensor will write text to JLabel Sensor while in Mymain.

Then I start the timer ReadSensor.

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I can't because it says it can't find the symbol variable SensorLL in SampleSensors class.

How can I "get to" that JLabel text when ever I need to?

Java Code:

public class MyMain {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
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[Code] .......

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The code was,

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import javax.swing.*;
import java.awt.*;
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[Code] .....

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