Using Eclipse Mars, I copied a tiny Java program from the Internet that displays a small window containing a "Click me!" JButton and a JLabel. Every time you click the button, the label is updated to show the total number of clicks. Trying to learn about Java packages, I added this package statement at the top:
package nineteen_3;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class Main {
public static void main(String [] args {
...
}
}
This code worked fine.
Learned the trick of making a JButton that looks like a JLabel, Decided to make a package of new objects beginning with KLabel, a modified JButton.
package laobjects;
import javax.swing.JButton;
public class KLabel extends JButton {
...
}
No compile errors.
Back in Main {}, I added this import statement for KLabel. Below are existing import statements:
import laobjects.KLabel;
... and get: The import laobjects cannot be resolved
And in the Main {} code:
KLabel lbl = new KLabel("Count: 0");
I'm getting KLabel cannot be resolved to a type
Both the Package and Project Explorers show 'KLabel' as hi-level entries:
KLabel
src
laobjects
KLabel.java
KLabel
label
KLabel(String)
Related
I already have the system library in my package and have tried resetting the metadata. What else can I do?
Errors with comments stating what errors they are.
package JFrameTest;
import java.awt.Dimension; //The package java.awt is not accessible
import javax.swing.JFrame; //The type javax.swing.JFrame is not accessible
public class Empty extends JFrame { //JFrame cannot be resolved to a type
public static void main (String[] args) {
new Main().setVisible(true); // Main cannot be resolved to a type
}
JavaFX was deleted from JDK, so you need to download JavaFX from here, here or use this guide. If you use maven just add the dependencies.
I'm learning GUI programming in java AWT and am a bit stuck. I can't add a couple of check-boxes in a frame the code i'm trying is-
package awt2;
import java.awt.*;
import java.awt.event.*;
public class Checkbox {
public static void main(String args[]) {
Frame mainFrame= new Frame("Checkbox test");
Checkbox checkBox1= new Checkbox();
Checkbox checkBox2= new Checkbox();
checkBox1.setBounds(100,100,50,50);
checkBox2.setBounds(150,120,50,50);
mainFrame.add(checkBox1);
mainFrame.add(checkBox2);
mainFrame.setVisible(true);
}
}
The error reckons this on checkBox1.setBounds() and checkBox2.setBounds()-
The method setBounds(int, int, int, int) is undefined for the type Checkbox
And on mainFrame.add()-
The method add(Component) in the type Container is not applicable for the arguments (Checkbox)
Can someone explain what these errors are all about and how can i fix them? Also i'm using eclipse IDE and javac version 1.8.0_144
You got a problem because your class is named Checkbox,
which is hiding the java.awt.Checkbox class.
Just choose another class name, for example CheckboxTest:
package awt2;
import java.awt.*;
import java.awt.event.*;
public class CheckboxTest {
// your code
}
I have the following question: I am trying to execute the usConstitution wordcram example (code follows) and if provided as is the code executes in eclipse, the applet starts and the word cloud is created. (code follows)
import processing.core.*;
//import processing.xml.*;
import wordcram.*;
import wordcram.text.*;
import java.applet.*;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.event.MouseEvent;
import java.awt.event.KeyEvent;
import java.awt.event.FocusEvent;
import java.awt.Image;
import java.io.*;
import java.net.*;
import java.text.*;
import java.util.*;
import java.util.zip.*;
import java.util.regex.*;
public class usConstitution extends PApplet {
/*
US Constitution text from http://www.usconstitution.net/const.txt
Liberation Serif font from RedHat: https://www.redhat.com/promo/fonts/
*/
WordCram wordCram;
public void setup() {
size(800, 600);
background(255);
colorMode(HSB);
initWordCram();
}
public void initWordCram() {
wordCram = new WordCram(this)
.fromTextFile("http://www.usconstitution.net/const.txt")
.withFont(createFont("https://www.redhat.com/promo/fonts/", 1))
.sizedByWeight(10, 90)
.withColors(color(0, 250, 200), color(30), color(170, 230, 200));
}
public void draw() {
if (wordCram.hasMore()) {
wordCram.drawNext();
}
}
public void mouseClicked() {
background(255);
initWordCram();
}
static public void main(String args[]) {
PApplet.main(new String[] { "--bgcolor=#ECE9D8", "usConstitution" });
}
}
My problem is the following:
I want to pass through main (which is the only static class) an argument so as to call the usConstitution.class from another class providing whichever valid filename I want in order to produce its word cloud. So how do I do that? I tried calling usConstitution.main providing some args but when I try to simply print the string I just passed to main (just to check if it is passed) I get nothing on the screen. So the question is How can I pass an argument to this code to customize .fromTextFile inside initWordCram ?
Thank you a lot!
from: https://wordcram.wordpress.com/2010/09/09/get-acquainted-with-wordcram/ :
Daniel Bernier says:
June 11, 2013 at 1:13 am
You can’t pass command-line args directly to WordCram, because it has no executable.
But you can make an executable wrapper (base it on the IDE examples that come with WordCram), and it can read command-line args & pass them to WordCram as needed.
FYI, it’ll still pop up an Applet somewhere – AFAIK, you can’t really run Processing “headless.” But that’s usually only a concern if you’re trying to run on a server.
I'm a beginner in Java and I followed a tutorial to write this program (yes, I that much of a beginner) and it works perfectly when I run it on Eclipse. It also runs great on the computer I coded it on. However, if I send it to another computer (just the .jar file) and run it, it fails because it can't find the icon. Here is everything I've got. The icon I'm using is saved in the bin folder along with all the class files for the program. For privacy reasons, I replaced certain lines with "WORDS".
The tutorial I followed in two parts:
Part 1 - https://buckysroom.org/videos.php?cat=31&video=18027
Part 2 - https://buckysroom.org/videos.php?cat=31&video=18028
My main class (I called it apples cause the tutorial did).
import javax.swing.JFrame;
public class apples {
public static void main(String[] args) {
Gui go = new Gui();
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
go.setSize(1920,1080);
go.setVisible(true);
}
}
And now my second class, "Gui":
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
public class Gui extends JFrame {
private JButton custom;
public Gui () {
super("WORDS");
setLayout(new FlowLayout());
Icon b = new ImageIcon(getClass().getResource("b.png"));
custom = new JButton(null, b);
custom.setToolTipText("WORDS");
add(custom);
HandlerClass handler = new HandlerClass();
custom.addActionListener(handler);
}
private class HandlerClass implements ActionListener {
public void actionPerformed(ActionEvent event) {
JOptionPane.showMessageDialog(null, String.format("WORDS", event.getActionCommand()));
JOptionPane.showMessageDialog(null, String.format("WORDS", event.getActionCommand()));
JOptionPane.showMessageDialog(null, String.format("WORDS", event.getActionCommand()));
JOptionPane.showMessageDialog(null, String.format("WORDS", event.getActionCommand()));
}
}
}
Thank you so much for helping!
It's worth reading Loading Images Using getResource where it's explained in detail along with loading images from jar as well.
You can try any one based on image location.
// Read from same package
ImageIO.read(getClass().getResourceAsStream("b.png"));
// Read from src/images folder
ImageIO.read(getClass().getResource("/images/b.png"))
// Read from src/images folder
ImageIO.read(getClass().getResourceAsStream("/images/b.png"))
Read more...
I have a general question about java. Because I want to create StronaGlowna.java (class) where I have place all buttons, check box and other GUI component which I want to display in main class. The first question is this right way, it's correct ? or maybe is better way to do this thing. My code look this:
import java.awt.CardLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
public class Main extends JFrame {
private static final long serialVersionUID = -4575271483481196192L;
Container pane;
CardLayout layout;
public Main() throws FileNotFoundException, IOException {
layout = new CardLayout();
setLayout(layout);
pane = this.getContentPane();
/*Page: Strona główna */
JPanel newPanel = new JPanel();
pane.add("New", newPanel);
JButton przycisk = new JButton("Przycisk");
newPanel.add(przycisk);
...
In "pane.add("New", newPanel);" I want to display elements from:
package aplikacja.glowna;
import javax.swing.JButton;
import javax.swing.JPanel;
public class StronaGlowna {
public void StronaGlownaDisplay() {
JPanel newPanel = new JPanel();
JButton przycisk2 = new JButton("Przycisk");
newPanel.add(przycisk2);
}
}
Can I import/display all class StronaGlowna in main() something like a include in PHP ? What do You thing about my idea, it's correct or I'm wrong ? Thanks for help and discussion.
It sounds like the way Netbeans handling GUI. You may view the article in http://netbeans.org/kb/docs/java/quickstart-gui.html, it may help you understand how the GUI works since Netbeans can generate code for you. You can always import class and create object to access methods (often public methods) . I think it is not like a include in PHP. PHP include is like to directly include the source code, but jave is not.
First - Never, never, never, code in Main class. Call a method from it and then start your staff in another class. And, of course, don't extend it. And the constructor is neither a good idea. All of these are bad practices. Now, going into your problem, my suggestion is that you make StronaGlowna extend JPanel, and then obtain an instance of it through a public constructor, and use that instance as the parameter for the constructor of JScrollPane. That will make the scrollPane act as a 'screen' inside which you can see the contents of StronaGlowna, which is what I understand you're after.