Author Topic: Random simple java programs that actually do something useful. (Read 37029 times)

nemo · « **Reply #60 on:** December 19, 2010, 05:03:04 pm »

you can also use AWT. Java has two GUI packages. Swing generally being preferred over AWT.

Munchor · « **Reply #61 on:** December 19, 2010, 06:40:53 pm »

Quote from: nemo on December 19, 2010, 05:03:04 pm

you can also use AWT. Java has two GUI packages. Swing generally being preferred over AWT.

I've always used JFrame, so never heard of others.

nemo · « **Reply #62 on:** December 19, 2010, 07:31:50 pm »

simple program that allows you to move a square around a 10 x 10 map. it's about 200 lines of code so i didn't post it here. don't be scared though, 60 lines of the 200 are just keyboard action events. you'll need to download the images and put them in the same directory as the source.

Munchor · « **Reply #63 on:** December 19, 2010, 07:32:34 pm »

Quote from: nemo on December 19, 2010, 07:31:50 pm

simple program that allows you to move a square around a 10 x 10 map. it's about 200 lines of code so i didn't post it here. don't be scared though, 60 lines of the 200 are just keyboard action events. you'll need to download the images and put them in the same directory as the source.

Needs compiling, right?

nemo · « **Reply #64 on:** December 19, 2010, 07:33:00 pm »

Quote from: ScoutDavid on December 19, 2010, 07:32:34 pm

Quote from: nemo on December 19, 2010, 07:31:50 pm
simple program that allows you to move a square around a 10 x 10 map. it's about 200 lines of code so i didn't post it here. don't be scared though, 60 lines of the 200 are just keyboard action events. you'll need to download the images and put them in the same directory as the source.

Needs compiling, right?

yes. but i can attach an executable jar if you want

Munchor · « **Reply #65 on:** December 20, 2010, 03:15:32 pm »

I thought that that random number generator was weak and made a new one, much more attractive. Attached is a .jar file and here is a screenshot and the code:

Code: [Select]

// Imports
import javax.swing.*;
import java.util.Random;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Main {
    public static void main(String[] args) {
		JFrame frame= new JFrame("Random Number generator");
                JPanel panel=new JPanel();
                final Random generator = new Random();
                final int randomNumber = generator.nextInt();
                final JTextArea textArea = new JTextArea(""+randomNumber,5,20);
                JLabel title = new JLabel("Random Number generator");
                JLabel empty = new JLabel("                                   "
                        + "                     "
                        + "                  ");
                JLabel programBy = new JLabel("                                                               by David Gomes");

                JButton generate = new JButton("Generate");
                generate.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent ev) {
                    final Random generator = new Random();
                    final int randomNumber = generator.nextInt();
                    textArea.setText(""+randomNumber);
                }
                });

                JButton quitButton = new JButton("Quit");

                quitButton.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent ev) {
                    System.exit(1);
                }
                });
                

                

                frame.add(panel);
                panel.add(title);
                
                panel.add(textArea);
                panel.add(generate);
                panel.add(quitButton);
                panel.add(empty);
                panel.add(programBy);
                frame.setSize(300,220);
                frame.setVisible(true);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);;
    }
}

Tell me what you think of it

Yeong · « **Reply #66 on:** December 27, 2010, 08:09:38 am »

awesome! I'm keep learning...

Munchor · « **Reply #67 on:** December 27, 2010, 08:28:36 am »

Quote from: yeongJIN_COOL on December 27, 2010, 08:09:38 am

awesome! I'm keep learning...

Do you like Java?

Yeong · « **Reply #68 on:** December 27, 2010, 08:29:45 am »

Yes, I do.
In fact I'm learning it right now(APCS)

Munchor · « **Reply #69 on:** December 27, 2010, 10:35:21 am »

Quote from: yeongJIN_COOL on December 27, 2010, 08:29:45 am

Yes, I do.
In fact I'm learning it right now(APCS)

That's great. Thanks for waking up this post

nemo · « **Reply #70 on:** December 30, 2010, 11:12:06 pm »

ColorChooser! it has more range than MS Paint, which really isn't saying much because the actual color-oriented math is done by java. change the final int SIZE in ColorChooser to make the size larger.

here's the source:

Code: [Select]

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

public class ColorChooserTest extends JFrame{

	public ColorChooserTest(){
		setSize(400,400);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setTitle("hi");
		ColorChooser panel = new ColorChooser();
		getContentPane().add(panel);
		setVisible(true);
		while(true)
			panel.repaint();
	}
	public static void main(String[] args){
		new ColorChooserTest();
	}
}

class ColorChooser extends JPanel implements MouseMotionListener,MouseListener{
	private final int SIZE = 200;
	private BufferedImage gradient = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_4BYTE_ABGR);
	private BufferedImage hueStrip = new BufferedImage(15, SIZE, BufferedImage.TYPE_4BYTE_ABGR);
	private Rectangle hueRect = new Rectangle(SIZE + 20,10,15,SIZE);
	private Rectangle gradientRect = new Rectangle(10,10,SIZE,SIZE);
	private float hue = 0;
	private Color selectedColor = Color.RED;
	public ColorChooser(){
		addMouseListener(this);
		addMouseMotionListener(this);
		setFocusable(true);
		generateHueStrip();
	}
	public void paintComponent(Graphics g){
		Graphics2D g2d = (Graphics2D) g;
		generateGradient();
		g2d.drawImage(gradient,null,10,10);
		g2d.drawImage(hueStrip,null,SIZE + 20,10);
		g2d.setColor(selectedColor);
		g2d.fillRect(10,SIZE+20,30,30);
	}
	
	private void generateHueStrip(){
		for(int i = 0; i < SIZE; i++){
			Color hsb = Color.getHSBColor((float)(i/(double)SIZE),(float) 1.0,(float) 1);
			for(int k = 0; k < 15; k++)
				hueStrip.setRGB(k,i,hsb.getRGB());
		}
	}
	private void generateGradient(){
		for(int saturation = SIZE-1; saturation >= 0; saturation--){
			for(int value = SIZE-1; value >= 0; value--){
				Color hsb = Color.getHSBColor(hue, (float) saturation / SIZE, (float) value / SIZE);
				gradient.setRGB(value, SIZE - 1 -saturation, hsb.getRGB());
			}
		}
	}
	public void mouseClicked(MouseEvent e) {
		int x = e.getX();
		int y = e.getY();
		if(hueRect.contains(x,y)){
			x -= SIZE + 20;
			y -= 10;
			Color rgb = new Color(hueStrip.getRGB(x,y));
			int red = rgb.getRed();
			int blue = rgb.getBlue();
			int green = rgb.getGreen();
			hue = Color.RGBtoHSB(red, green, blue, null)[0];
		}
		else
			if(gradientRect.contains(x,y))
				selectedColor = new Color(gradient.getRGB(x-10,y-10));
			
	}
	public void mouseDragged(MouseEvent e) {
		mouseClicked(e);
	}
	public void mouseMoved(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}
	public void mousePressed(MouseEvent e) {}
	public void mouseReleased(MouseEvent e){}
}

Binder News · « **Reply #71 on:** December 30, 2010, 11:56:53 pm »

I love everything about Java, except that the source is VERY insecure.

nemo · « **Reply #72 on:** December 31, 2010, 12:12:44 am »

Quote from: Binder News on December 30, 2010, 11:56:53 pm

I love everything about Java, except that the source is VERY insecure.

you can always just bundle everything up in a couple meaningless wrapper classes, have one-letter var names, method names and classes. and make all your classes implement random interfaces completely off-base to their real purpose. define a final constant True as 0, and False as 1. write comments that lie. of course this really just bloats your code and makes it unmaintainable.. BUT, no one's going to pick through it.

jnesselr · « **Reply #73 on:** December 31, 2010, 05:07:31 pm »

Quote from: nemo on December 31, 2010, 12:12:44 am

Quote from: Binder News on December 30, 2010, 11:56:53 pm
I love everything about Java, except that the source is VERY insecure.

you can always just bundle everything up in a couple meaningless wrapper classes, have one-letter var names, method names and classes. and make all your classes implement random interfaces completely off-base to their real purpose. define a final constant True as 0, and False as 1. write comments that lie. of course this really just bloats your code and makes it unmaintainable.. BUT, no one's going to pick through it.

True, or you could write classes that are like the programs that read their own source code, but instead, they decrypt themselves into a program that compiles the real program that then runs. It only takes 10 days to run a hello world program, but hey, it's secure, right? ;-)

But seriously, Java has it's uses and I like it for quite a few things. The fact that I can always get the source of a jar file within two clicks is one of them.

Munchor · « **Reply #74 on:** February 10, 2011, 01:58:56 pm »

Code: [Select]

package javaapplication1;

import java.awt.Color;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * NewJFrame.java
 *
 * Created on 10/Fev/2011, 0:01:33
 */

/**
 *
 * @author david
 */
public class NewJFrame extends javax.swing.JFrame {

    /** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jTextField2 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jColorChooser1 = new javax.swing.JColorChooser();
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenu2 = new javax.swing.JMenu();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Text Editor");

        jTextField2.setForeground(jColorChooser1.getColor());

        jButton1.setText("UPDATE");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jMenu1.setText("File");

        jMenuItem1.setText("New");
        jMenu1.add(jMenuItem1);

        jMenuBar1.add(jMenu1);

        jMenu2.setText("Edit");
        jMenuBar1.add(jMenu2);

        setJMenuBar(jMenuBar1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, 301, Short.MAX_VALUE)
                    .addComponent(jTextField2, javax.swing.GroupLayout.DEFAULT_SIZE, 301, Short.MAX_VALUE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jColorChooser1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jTextField2, javax.swing.GroupLayout.DEFAULT_SIZE, 257, Short.MAX_VALUE)
                        .addGap(18, 18, 18)
                        .addComponent(jButton1))
                    .addComponent(jColorChooser1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        this.jTextField2.setText("");
        this.jTextField2.setForeground(this.jColorChooser1.getColor());
)
    }                                        

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
                
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JColorChooser jColorChooser1;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JTextField jTextField2;
    // End of variables declaration

}

Code: [Select]

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package javaapplication1;

public class Main {
    
    public static void main(String[] args) {
        NewJFrame form = new NewJFrame();
        form.setVisible(true);

        
    }

}

The second one is Main.java and the first one is NewJFrame.java.

The thing is I'm using Color Chooser under Swing Windows, it's automatic.

Author Topic: Random simple java programs that actually do something useful. (Read 37029 times)

nemo

Re: Random simple java programs that actually do something useful.

Munchor

Re: Random simple java programs that actually do something useful.

nemo

Re: Random simple java programs that actually do something useful.

Munchor

Re: Random simple java programs that actually do something useful.

nemo

Re: Random simple java programs that actually do something useful.

Munchor

Re: Random simple java programs that actually do something useful.

Yeong

Re: Random simple java programs that actually do something useful.

Munchor

Re: Random simple java programs that actually do something useful.

Yeong

Re: Random simple java programs that actually do something useful.

Munchor

Re: Random simple java programs that actually do something useful.

nemo

Re: Random simple java programs that actually do something useful.

Binder News

Re: Random simple java programs that actually do something useful.

nemo

Re: Random simple java programs that actually do something useful.

jnesselr

Re: Random simple java programs that actually do something useful.

Munchor

Re: Random simple java programs that actually do something useful.