Wydawało mi się tak oczywiste, że tego tam ma nie być, że z lenistwa nie zrobiłem osobnego bloku code. Ten fragment kodu jest tam gdzie tworzy go netbeans, Red Square jest w osobnym pliku. Kod w założeniu bardzo podobny do pierwszego posta:
package javaapplication11;
public class Main {
public static void main(String[] args) {
new NewJFrame().setVisible(true);
}
}
package javaapplication11;
public class zmienna {
int x = 1;
}
package javaapplication11;
public class NewJFrame extends javax.swing.JFrame {
zmienna var = new zmienna();
/** Creates new form NewJFrame */
public NewJFrame() {
initComponents();
}
[.......]
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
var.x = 2;
}
Działa bez problemu.
EDIT:
Zadam pytanie inaczej :D Jak mając kod z oficjalnego tutoriala zmienić wartość xPos w redSquare?:
package painting;
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.BorderFactory;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseMotionAdapter;
public class SwingPaintDemo4 {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
private static void createAndShowGUI() {
System.out.println("Created GUI on EDT? "+
SwingUtilities.isEventDispatchThread());
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new MyPanel());
//f.setSize(250,250);
f.setVisible(true);
}
}
class MyPanel extends JPanel {
RedSquare redSquare = new RedSquare();
public MyPanel() {
setBorder(BorderFactory.createLineBorder(Color.black));
addMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent e){
moveSquare(e.getX(),e.getY());
}
});
addMouseMotionListener(new MouseAdapter(){
public void mouseDragged(MouseEvent e){
moveSquare(e.getX(),e.getY());
}
});
}
private void moveSquare(int x, int y){
// Current square state, stored as final variables
// to avoid repeat invocations of the same methods.
final int CURR_X = redSquare.getX();
final int CURR_Y = redSquare.getY();
final int CURR_W = redSquare.getWidth();
final int CURR_H = redSquare.getHeight();
final int OFFSET = 1;
if ((CURR_X!=x) || (CURR_Y!=y)) {
// The square is moving, repaint background
// over the old square location.
repaint(CURR_X,CURR_Y,CURR_W+OFFSET,CURR_H+OFFSET);
// Update coordinates.
redSquare.setX(x);
redSquare.setY(y);
// Repaint the square at the new location.
repaint(redSquare.getX(), redSquare.getY(),
redSquare.getWidth()+OFFSET,
redSquare.getHeight()+OFFSET);
}
}
public Dimension getPreferredSize() {
return new Dimension(250,200);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawString("This is my custom Panel!",10,20);
redSquare.paintSquare(g);
}
}
class RedSquare{
private int xPos = 50;
private int yPos = 50;
private int width = 20;
private int height = 20;
public void setX(int xPos){
this.xPos = xPos;
}
public int getX(){
return xPos;
}
public void setY(int yPos){
this.yPos = yPos;
}
public int getY(){
return yPos;
}
public int getWidth(){
return width;
}
public int getHeight(){
return height;
}
public void paintSquare(Graphics g){
g.setColor(Color.RED);
g.fillRect(xPos,yPos,width,height);
g.setColor(Color.BLACK);
g.drawRect(xPos,yPos,width,height);
}
}
Wybaczcie jeżeli pytanie nadaje się do przedszkola ale Javą bawie się od niedawna :P