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Je suis complètement nouveau à Java et j'apprends comment écrire un programme qui détecte et réagit à la collision basée sur la vidéo de conférence d'un professeur. Voici un link à la vidéo.Erreur dans NewJFrame avec ActionListener
Tout mon code devrait ressembler à ce qu'il y a dans sa conférence. Mon erreur semble être dans le fichier NewJFrame.java. Pourquoi ActionListener ne fonctionne-t-il pas? Merci d'avance pour l'aide.
/*
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*/
package collisiondetection;
import java.awt.event.ActionListener;
import javafx.event.ActionEvent;
import javax.swing.Timer;
/**
*
* @author PC
*/
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
bf = new BallField(getWidth(), getHeight());
add(bf);
pack();
njTimer = new Timer(1,
new ActionListener() {
public void actionPerformed(ActionEvent e) {
bf.detectCollision();
}
});
njTimer.start();
}
BallField bf;
Timer njTimer;
/**
* 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() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
// End of variables declaration
}
La ligne disant "new ActionListener() {" est souligné et je reçois un message d'erreur indiquant:
Exception dans le thread "principal" java.lang.RuntimeException: code source Uncompilable - n'est pas abstraite et ne remplace pas la méthode abstraite actionPerformed (java.awt.event.ActionEvent) dans java.awt.event.ActionListener à collisiondetection.NewJFrame. (NewJFrame.java:28) à collisiondetection.Main.main (Main.java:20
NewJFrame.java:28 fait référence à la ligne qui dit "njTimer = new Timer (1," dans la morue e ci-dessus.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~
Voici mon code pour les autres fichiers .java à titre de référence.
Fichier principal:
/*
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*/
package collisiondetection;
/**
*
* @author PC
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
NewJFrame njf = new NewJFrame();
njf.setVisible(true);
}
}
BallField.java:
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package collisiondetection;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.util.LinkedList;
import java.util.ListIterator;
import javax.swing.JPanel;
/**
*
* @author PC
*/
public class BallField extends JPanel {
public BallField(int width, int height)
{
setSize(new Dimension(width, height));
setMinimumSize(new Dimension(width, height));
setMaximumSize(new Dimension(width, height));
bfList = new LinkedList<Shape>();
fillList();
}
public void detectCollision()
{
if(bfList.size() == 0)
{
fillList();
}
bfBall.move();
ListIterator iter = bfList.listIterator();
boolean collision = false;
while ((collision == false && iter.hasNext()))
{
Shape sh = (Shape) iter.next();
if(sh.collide(bfBall))
{
iter.remove();
collision = true;
}
}
}
public void PaintComponent(Graphics gfx)
{
int bWidth = getWidth();
int bHeight = getHeight();
gfx.setColor(bfBackground);
gfx.fillRect(0, 0, bWidth, bHeight);
ListIterator iter = bfList.listIterator();
while(iter.hasNext())
{
Shape sh = (Shape) iter.next();
sh.drawShape(gfx);
}
bfBall.drawBall(gfx);
}
private void fillList() {
int bWidth = getWidth();
int bHeight = getHeight();
int size = Math.min(bWidth, bHeight);
size -= Math.max(bfNumRow, bfNumCol) * brickGap;
size = size/(Math.max(bfNumRow, bfNumCol) + bfEmptyRow);
// add more margin
Shape.setSize(size);
if (bfBall == null) {
bfBall = new MovingBall(size, bWidth, bHeight);
} else {
bfBall.reset();
}
for (int rowCnt = 0; rowCnt < bfNumRow; rowCnt++) {
int xloc = bWidth/2 - (bfNumRow/2 - rowCnt) * (size + brickGap);
for (int colCnt = 0; colCnt < bfNumCol; colCnt++) {
double rand = Math.random();
Float cR = new Float(Math.random());
Float cG = new Float(Math.random());
Float cB = new Float(Math.random());
Color bc = new Color(cR.floatValue(), cG = cG.floatValue(), cB.floatValue());
int yloc = bHeight/2 - (bfNumCol/2 - colCnt) * (size + brickGap);
if (rand > .5) {
Circle cb = new Circle(xloc, yloc, bc);
bfList.add(cb);
} else {
Square sb = new Square(xloc, yloc, bc);
bfList.add(sb);
}
}
}
}
LinkedList<Shape> bfList;
MovingBall bfBall;
static private final Color bfBackground = Color.white;
static private final int bfNumRow = 6;
static private final int bfNumCol = 6;
static private final int bfEmptyRow = 4;
static private final int brickGap = 4;
}
Vector2D.java
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*/
package collisiondetection;
/**
*
* @author PC
*/
public class Vector2D {
public Vector2D(double x, double y, boolean u)
{
xVal = x;
yVal = y;
unit = u;
if(unit)
{
makeUnit();
}
}
public void add(Vector2D vec)
{
xVal += vec.xVal;
yVal += vec.yVal;
if(unit)
{
makeUnit();
}
}
public double getX()
{
return xVal;
}
public double getY()
{
return yVal;
}
public void reflect(Vector2D nor)
{
if((unit == false) || (nor.unit == false))
{
System.out.println("ERROR, not unit vector");
}
double ip = innerProduct(nor);
xVal += -2 * ip * nor.xVal;
yVal += -2 * ip * nor.yVal;
makeUnit();
}
private double innerProduct(Vector2D vec)
{
return (xVal * vec.xVal + yVal * vec.yVal);
}
private void makeUnit()
{
double mag = xVal * xVal + yVal * yVal;
if(mag == 0)
{
System.out.println("ERROR, zero vector");
}
else
{
mag = Math.sqrt(mag);
xVal /= mag;
yVal /= mag;
}
}
private double xVal;
private double yVal;
private boolean unit;
}
MovingBall.java
/*
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*/
package collisiondetection;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
/**
*
* @author PC
*/
public class MovingBall {
public MovingBall(int sz, int bw, int bh)
{
mbSize = sz;
bWidth = bw;
bHeight = bh;
reset();
}
public Rectangle getRect()
{
return (new Rectangle((int) Math.round(mbLoc.getX() - mbSize/2), (int) Math.round(mbLoc.getY() - mbSize/2), mbSize, mbSize));
}
public void reset()
{
mbLoc = new Vector2D(mbSize, mbSize, false);
mbVel = new Vector2D(Math.random() + .1, Math.random() + .1, true);
}
public double getX()
{
return mbLoc.getX();
}
public double getY()
{
return mbLoc.getY();
}
public int getSize()
{
return mbSize;
}
public void reflect(Vector2D nor)
{
mbVel.reflect(nor);
}
public void move()
{
mbLoc.add(mbVel);
// hit a wall?
if(mbLoc.getX() >= (bWidth - mbSize/2))
{
// hit right wall
Vector2D nor = new Vector2D(-1, 0, true);
reflect(nor);
}
if(mbLoc.getY() >= (bHeight - mbSize/2))
{
Vector2D nor = new Vector2D(0, -1, true);
reflect(nor);
}
}
public void drawBall(Graphics gfx)
{
int x = (int) Math.round(mbLoc.getX() - mbSize/2);
int y = (int) Math.round(mbLoc.getY() - mbSize/2);
gfx.setColor(bColor);
gfx.fillOval(x, y, mbSize, mbSize);
}
private Vector2D mbLoc;
private Vector2D mbVel;
private int mbSize;
private Color bColor = Color.black;
int bWidth;
int bHeight;
}
Shape.java
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package collisiondetection;
import java.awt.Color;
import java.awt.Graphics;
/**
*
* @author PC
*/
abstract public class Shape {
public Shape(int x, int y, Color c)
{
s_X = x;
s_Y = y;
s_Color = c;
}
public static void setSize(int sz)
{
s_Size = sz;
}
abstract public boolean collide(MovingBall ball);
abstract public void drawShape(Graphics gfx);
protected int s_X;
protected int s_Y;
protected Color s_Color;
protected static int s_Size;
}
Square.java
/*
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* and open the template in the editor.
*/
package collisiondetection;
import static collisiondetection.Shape.s_Size;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
/**
*
* @author PC
*/
public class Square extends Shape {
public Square(int x, int y, Color c)
{
super(x, y, c);
}
public boolean collide(MovingBall ball)
{
Rectangle r1 = new Rectangle(s_X - s_Size/2, s_Y - s_Size, s_Size, s_Size);
Rectangle r2 = ball.getRect();
Rectangle r3 = r1.intersection(r2);
if (r3.isEmpty())
{
// no collision
// note thatr3 is not null
return false;
}
if (r3.getWidth() < r3.getHeight())
{
// hit horizontally
if (ball.getX() < s_X) {
// hit the left side
Vector2D nor = new Vector2D(-1, 0, true);
ball.reflect(nor);
} else {
Vector2D nor = new Vector2D(1, 0, true);
ball.reflect(nor);
}
} else {
if (ball.getY() < s_Y) {
// hit the top
Vector2D nor = new Vector2D(0, -1, true);
ball.reflect(nor);
} else {
Vector2D nor = new Vector2D(0, 1, true);
ball.reflect(nor);
}
}
return true;
}
public void drawShape(Graphics gfx)
{
gfx.setColor(s_Color);
gfx.fillRect(s_X - s_Size/2, s_Y - s_Size/2, s_Size, s_Size);
}
}
Cirlce.java
/*
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*/
package collisiondetection;
import java.awt.Color;
import java.awt.Graphics;
/**
*
* @author PC
*/
public class Circle extends Shape{
public Circle(int x, int y, Color c)
{
super(x, y, c);
}
public boolean collide(MovingBall ball)
{
double deltaX = ball.getX() - s_X;
double deltaY = ball.getY() - s_Y;
double centerDistance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
if(centerDistance * 2 > s_Size + ball.getSize())
{
// no collision
// size is the diameter, not radius
return false;
}
Vector2D nor = new Vector2D(deltaX, deltaY, true);
ball.reflect(nor);
return true;
}
public void drawShape(Graphics gfx)
{
gfx.setColor(s_Color);
gfx.fillOval(s_X - s_Size/2, s_Y - s_Size/2, s_Size, s_Size);
}
}
L'erreur est partie! Je m'en souviendrai, merci. Il ne fait toujours pas ce que je voudrais lorsque j'essaie de l'exécuter, seul un cadre vide est affiché. Le professeur ne va pas dans l'onglet design du NewJFrame pour ajouter le champ ou quoi que ce soit alors qu'est-ce qui me manque? – user3727832
@ user3727832: c'est une question distincte, et avant de la poser ici, je vous suggère de faire un peu de débogage pour essayer d'isoler l'erreur. –