Thread: Can anyone help me in coding Java for my GUI trials for Learning Button Commands?

I want to make a drawing move left and right when I click on the appropriate button and the save its coordinates and then load its coordinates...
also bring it home by resetting its coordinates by pressing (clicking) aapropriate buttons

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
[B]// Please give IDEA!!![/B]
 
public class MyQ3FrameTrials extends JFrame
{
JPanel p1, p2;
JCheckBox Face, Head, Tail, Body;
JButton Left, Right, Reset, Load, Save;
 
public MyFrameTrials()
{
setTitle("MyTrialsForLearningButtonComma…
setSize(600, 250);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
 
p1 = new JPanel();
p2 = new JPanel();
 
Face = new JCheckBox("String");
Head = new JCheckBox("Circle");
Tail = new JCheckBox("Line");
Body = new JCheckBox("Rectangle");
 
Left = new JButton("<< Move left");
Right = new JButton(">> Move right");
Reset = new JButton("Reset coordinates");
Load = new JButton("Load last saved coordinates");
Save = new JButton("Save current coordinates");
 
Container cp = getContentPane();
cp.add(p1, BorderLayout.WEST);
cp.add(p2, BorderLayout.SOUTH);
 
p1.setLayout(new GridLayout(5, 1));
p1.add(Face);
p1.add(Head);
p1.add(Tail);
p1.add(Body);
 
p2.setLayout(new GridLayout(2 ,3));
p2.add(Left);
p2.add(Right);
p2.add(Reset);
p2.add(Load);
p2.add(Save);
 
Face.addMouseListener(new ButtonWatcher());
Head.addMouseListener(new ButtonWatcher());
Tail.addMouseListener(new ButtonWatcher());
Body.addMouseListener(new ButtonWatcher());
 
Left.addMouseListener(new ButtonWatcher());
Right.addMouseListener(new ButtonWatcher());
Reset.addMouseListener(new ButtonWatcher());
Load.addMouseListener(new ButtonWatcher());
Save.addMouseListener(new ButtonWatcher());
 
}
public class ButtonWatcher extends MouseAdapter
{
public void mouseClick (MouseEvent e)
{
Object buttonPressed = e.getSource();
if (buttonPressed.equals(Left))
{
[B]// what to code here ... Please give IDEA![/B]
}
if (buttonPressed.equals(Right))
{
[B]// what to code here ... Please give IDEA![/B]
}
 
}
}
public void paint (Graphics g)
{
g.drawRect(140, 40, 440, 140);
g.setColor(Color.WHITE);
g.fill3DRect(140, 40, 440, 140, true);
g.setColor(Color.WHITE);
 
if(Head.isSelected())
{
g.setColor(Color.RED);
g.fillOval(250 ,85 ,40 ,25);
}
if(Tail.isSelected())
{
g.setColor(Color.RED);
g.drawLine(200, 100, 190, 75);
}
if(Body.isSelected())
{
g.setColor(Color.RED);
g.fillRect(200, 100, 60, 40);
}
if(Face.isSelected())
{
g.setColor(Color.BLACK);
g.setFont(new Font(" ",Font.BOLD, 20));
g.drawString("* --", 260, 105);
}
}
 
 
public static void main (String[] args)
{
 
MyFrameTrials f1 = new MyFrameTrials();
f1.paint(null);
 
}
 
}

I have made another class called Pixel, for my x and y int values...

here is the code for it

 
import java.awt.Color;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
 
public class Pixel extends Point
 { 
    private Color color = Color.green; 
    public Pixel() 
    { 
        super(); 
        color = Color.red;
 
    }  
 
    public  Pixel (int newX,  int newY,  Color NEWCOLOR) 
    { 
        x = newX ; 
        y = newY ; 
        color = NEWCOLOR;
 
    }  
 
@Override
    public void reset() 
    { 
        x = 110;
        y = 100;
        color = Color.red;
 
    } 
 
//getter method
    public Color getColor()
    {
        return color;
 
    }
 
//setter method
    public void setColor(Color aColor)
    {
        color = aColor;
 
    }
 
@Override
    public boolean equals(Object o) 
      {  
        if((o instanceof Pixel) && this.x == ((Pixel)o).x && this.y == ((Pixel)o).y && this.color == ((Pixel)o).color)
          {  
             return true;  
          }
          else
             {
                 return false;
             }    
 
      }
 
    @Override
    public int hashCode() 
      {
        int hash = 7;
        hash = 67 * hash + (this.color != null ? this.color.hashCode() : 0);
        return hash;
      }
 
    public void loadPos(String filename) throws IOException
      {
        try
         {
           File myFile = new File("D:/coordinates.txt");
           Scanner scn = new Scanner(myFile);
           x = Integer.parseInt(scn.nextLine());
           y = Integer.parseInt(scn.nextLine());
           scn.close();
         }
        catch(IOException exception)
         {
           System.out.println(exception);
         }
      }
 
    public void savePos(String filename) throws IOException
      {
        try
         {
            FileWriter fw = new FileWriter("D:/coordinates.txt");
            PrintWriter pw = new PrintWriter(fw);
            pw.println(x);
            pw.println(y);
            pw.close();
         }
        catch(IOException error)
         {
            System.out.println(error);
         }
      }
 
 }

Please advise... I am a beginner and a novice rookie... can you help me by providing me with the actual code so that I might learn it... Thanks
I will then experiment and make other things... I first need to know what to write I do not know the syntax or commands to be written.
Can you please help me!!!

Please Edit your post and wrap your code with[code=java]<YOUR CODE HERE>[/code] to get highlighting

To cause a drawn image to be at a different location after a button press, you need to have class variables like x and y that the draw method uses (your code uses hardcoded values) that the button listener code can change before it calls repaint. If the x,y values are changed the next call to the paint method will call the draw methods with that new location to draw at.

Do you understand what the parameters are to the draw methods you are using in the paint() method?
If you do not change them, the drawing will always be done at the same place.
Change the parameters to the draw methods to use variables defined out side of the paint() method.
Have the code in the button listener methods change their values to have the draw methods draw at a new location.

You should look at the API doc for the methods to see what their parameters are:
Java Platform SE 6

Find the class in the lower left and click on it to get the class's API doc in the main frame.

Thank you for your reply!
Can you please give an example .... I'd prefer if you could write a sample code or amend mines...
cause i am confused...
please help me understand... and learn...
I appreciate your efforts Norm

also, I do not understand the parameters of the paint() method... please advise...
I looked at the javaDoc but it confused me more I do not understand it or how to use the JavaDoc to write my code... sorry!

Do it one step at a time.
Change the calls to the draw method to use variables instead of hardcoded numbers. For example:
g.drawShape(10, 30,...
change to
g.drawShape(x,y,...

Define x and y as int variables outside of the paint() method:
int x = 10;
int y = 30;

Do one thing at a time, get it to work and then try doing another.
First get all of the draw methods to use the x,y variables.
Change all of the draw methods to use the x,y values corrected to where each one should be.

I don't do student code. I've explained what you need to do. Do it one small step at a time.
define the x and y and use it in one of the draw methods. Compile and execute to see that is works.

Post the errors and the code if you have problems.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at MySolutions.MyFrame.paint(MyFrame.java:84)

There is a variable with a null value on line 84. Look at line 84 and find the variable with the null value and then backtrack in the code to find out why that variable does not have a valid non-null value.

Use a println before line 84 to print all the variables on line 84 to see which one has the null value.

how to auto refresh in java so that my output window gets updated

Don't call setVisible until everything is ready to be shown.