Diskuze: Pomoc s programom vyhadzuje mi tuto chybu neviem ako to opravit

Java Java Pomoc s programom vyhadzuje mi tuto chybu neviem ako to opravit

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Exception in thread "Timer-0" java.lang.NullPo­interException
at hra.Okno$Sche­duleTask.run(Ok­no.java:126)
at java.util.Timer­Thread.mainLo­op(Timer.java:555)
at java.util.Timer­Thread.run(Ti­mer.java:505)

package hra;


import javax.swing.ImageIcon;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author david
 */
public class Gulka extends Obraz implements InterKsicht {

    private int smerX;
    private int smerY;

    public Gulka() {
        this.smerX = 1;
        this.smerY = -1;

        ImageIcon ii = new ImageIcon("nemo.gif");
        obrazok = ii.getImage();

        sirkaObrazka = obrazok.getWidth(null);
        vyskaObrazka = obrazok.getHeight(null);

        resetGulky();

    }

    public void pohybGulky() {
        x = x + smerX;
        y = y + smerY;

        if (x == 0) {
            nastavSmerX(1);

        }

        if (x == SIRKA - sirkaObrazka) {
            nastavSmerX(-1);

        }

        if (y == 0) {
            nastavSmerY(1);

        }
    }

    private void resetGulky() {
        x = START_GULKA_X;
        y = START_GULKA_Y;

    }

    public void nastavSmerX(int x) {
        this.smerX = x;
    }

    public void nastavSmerY(int y) {
        this.smerY = y;
    }
    public int dajSmerY() {
        return smerY;
    }
package hra;


import java.awt.EventQueue;
import javax.swing.JFrame;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author david
 */
public class Hra extends JFrame {
    public Hra() {
        nastavGUI();
    }

    private void nastavGUI() {
        add(new Okno());
        setTitle("Hra 1000!");

        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(InterKsicht.SIRKA, InterKsicht.VYSKA);
        setLocationRelativeTo(null);
        setResizable(false);
        setVisible(true);
    }
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            Okno hra = new Okno();
            hra.setVisible(true);
        });
                }
}
package hra;


import java.awt.event.KeyEvent;
import javax.swing.ImageIcon;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author david
 */
public class Hrac extends Obraz implements InterKsicht {

    private int smerX;

    public Hrac() {

        ImageIcon ii = new ImageIcon("Postava.png");
        obrazok = ii.getImage();

        sirkaObrazka = obrazok.getWidth(null);
        vyskaObrazka = obrazok.getHeight(null);

        resetHraca();
    }

    public void pohybHraca() {
        x = x + smerX;

        if (x <= 0) {
            x = 0;
        }

        if (x >= SIRKA - sirkaObrazka) {
            x = SIRKA - sirkaObrazka;
        }
    }

    public void stlaceneTlacitko(KeyEvent e) {
        int key = e.getKeyCode();

        if(key == KeyEvent.VK_LEFT) {
            smerX = -1;
        }
        if(key == KeyEvent.VK_RIGHT) {
            smerX = 1;
        }
    }
    public void pusteneTlacitko(KeyEvent e) {
        int key = e.getKeyCode();

        if (key == KeyEvent.VK_LEFT) {
            smerX = 0;

        }
        if (key == KeyEvent.VK_RIGHT) {
            smerX = 0;

        }

    }
    private void resetHraca() {
        x = START_HRAC_X;
        y = START_HRAC_Y;
    }
}
package hra;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author david
 */
public interface InterKsicht {

    public static final int SIRKA = 300;
    public static final int VYSKA = 400;
    public static final int DOLNY_OKRAJ = 390;
    public static final int N_TEHAL = 30;
    public static final int START_HRAC_X = 200;
    public static final int START_HRAC_Y = 360;
    public static final int START_GULKA_X = 230;
    public static final int START_GULKA_Y = 355;
    public static final int DELAY = 1000;
    public static final int INTERVAL = 10;

}
package hra;


import java.awt.Image;
import java.awt.Rectangle;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author david
 */
public class Obraz {
    protected int x;
    protected int y;
    protected int sirkaObrazka;
    protected int vyskaObrazka;
    protected Image obrazok;


    public void nastavX(int x) {
        this.x = x;
    }

    public int dajX() {
        return x;
    }

    public void nastavY(int y) {
        this.y = y;
    }

    public int dajY() {
        return y;
    }

    public int dajSirkuObrazka() {
        return sirkaObrazka;
    }

    public int dajVyskuObrazka() {
        return vyskaObrazka;
    }

    Image dajObrazok() {
        return obrazok;
    }

    Rectangle dajObdlznik() {
        return new Rectangle(x, y, obrazok.getWidth(null), obrazok.getHeight(null));
    }

}
package hra;


import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JPanel;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author david
 */
public class Okno extends JPanel implements InterKsicht {

    private Timer casovac;
    private String sprava = "Game Over";
    private Gulka gulka;
    private Hrac hrac;
    private Tehla tehly[];
    private boolean hra = true;


    public Okno() {
        nastavenieOkna();
    }
    private void nastavenieOkna() {
        addKeyListener(new Adapter());
        setFocusable(true);

        tehly = new Tehla[N_TEHAL];
        setDoubleBuffered(true);
        casovac = new Timer();
        casovac.scheduleAtFixedRate(new ScheduleTask(), DELAY, INTERVAL);
    }


    public void addNotify() {
        super.addNotify();
        nastavenieHry();
    }

    private void nastavenieHry() {
        gulka = new Gulka();
        hrac = new Hrac();

        int k = 0;

        for (int i = 0; i < 5; i++ ) {
            for (int j = 0; j < 6; j++) {
                tehly[k] = new Tehla(j*40+30,i*10+50);
                k++;
            }
        }
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g;
         g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        g2d.setRenderingHint(RenderingHints.KEY_RENDERING,
                RenderingHints.VALUE_RENDER_QUALITY);
        if(hra) {
            kresliObjekt(g2d);
        }else {
            hraSkoncila(g2d);
        }
        Toolkit.getDefaultToolkit().sync();

    }

    private void kresliObjekt(Graphics2D g2d) {
        g2d.drawImage(gulka.dajObrazok(), gulka.dajX(), gulka.dajY(),
                gulka.dajSirkuObrazka(),gulka.dajVyskuObrazka(),this);

        g2d.drawImage(hrac.dajObrazok(), hrac.dajX(),hrac.dajY(),
                hrac.dajSirkuObrazka(),hrac.dajVyskuObrazka(), this);

        for (int i = 0; i < N_TEHAL; i++) {
            if (!tehly[i].znicenaTehla()) {
                g2d.drawImage(tehly[i].dajObrazok(),tehly[i].dajX(),tehly[i].dajY(),
                        tehly[i].dajSirkuObrazka(),tehly[i].dajVyskuObrazka(), this);
            }
        }
    }

   private void hraSkoncila(Graphics2D g2d) {
       Font font = new Font ("Verdana", Font.BOLD, 18);
       FontMetrics metr = this.getFontMetrics(font);

       g2d.setColor(Color.BLACK);
       g2d.setFont(font);
       g2d.drawString(sprava,(InterKsicht.SIRKA - metr.stringWidth(sprava)) / 2,InterKsicht.SIRKA / 2);
   }

   private class Adapter extends KeyAdapter {

        public void pusteneTlacitko(KeyEvent e) {
            hrac.pusteneTlacitko(e);
        }

        public void stlaceneTlacitko(KeyEvent e) {
            hrac.stlaceneTlacitko(e);
        }
    }
   private class ScheduleTask extends TimerTask {

       public void run() {
           gulka.pohybGulky();
           hrac.pohybHraca();
           kolizie();
           repaint();
       }
   }
   private void koniecHry() {
       hra = false;
       casovac.cancel();
   }

   private void kolizie() {

       if (gulka.dajObdlznik().getMaxY() > InterKsicht.DOLNY_OKRAJ) {
           koniecHry();
       }

       for (int i = 0, j = 0; i < N_TEHAL; i++) {

           if (tehly[i].znicenaTehla()) {
               j++;
            }
           if (j == N_TEHAL) {
               sprava = "VICTORY";
               koniecHry();
           }
       }

       if ((gulka.dajObdlznik().intersects(hrac.dajObdlznik()))) {
           int poziciaHraca = (int) hrac.dajObdlznik().getMinX();
           int poziciaGulky = (int) hrac.dajObdlznik().getMinX();

           int prvy = poziciaHraca + 8;
           int druhy = poziciaHraca + 16;
           int treti = poziciaHraca + 24;
           int stvrty = poziciaHraca + 32;

           if(poziciaGulky < prvy) {
               gulka.nastavSmerX(-1);
               gulka.nastavSmerY(-1);
           }

           if(poziciaGulky >= prvy && poziciaGulky < druhy) {
               gulka.nastavSmerX(-1);
               gulka.nastavSmerY(-1 * gulka.dajSmerY());

           }

           if (poziciaGulky >= druhy && poziciaGulky < treti) {
               gulka.nastavSmerX(0);
               gulka.nastavSmerY(-1);
           }

           if (poziciaGulky >= treti && poziciaGulky < stvrty) {
               gulka.nastavSmerX(1);
               gulka.nastavSmerY(-1 * gulka.dajSmerY());

           }

           if (poziciaGulky > stvrty) {
               gulka.nastavSmerX(1);
               gulka.nastavSmerY(-1);

           }
        }

       for (int i = 0; i < N_TEHAL; i++) {

           if ((gulka.dajObdlznik().intersects(tehly[i].dajObdlznik()))) {

               int lavaGulka = (int) gulka.dajObdlznik().getMinX();
               int vyskaGulky = (int) gulka.dajObdlznik().getHeight();
               int sirkaGulky = (int) gulka.dajObdlznik().getWidth();
               int vrchGulky = (int)  gulka.dajObdlznik().getMinY();

               Point pravyBod = new Point(lavaGulka + sirkaGulky + 1, vrchGulky);
               Point lavyBod = new Point(lavaGulka - 1,vrchGulky);
               Point vrchnyBod = new Point(lavaGulka, vrchGulky - 1);
               Point spodnyBod = new Point(lavaGulka, vrchGulky + vyskaGulky + 1);

               if (!tehly[i].znicenaTehla()) {
                   if (tehly[i].dajObdlznik().contains(pravyBod)) {
                       gulka.nastavSmerX(-1);
                   }else if (tehly[i].dajObdlznik().contains(lavyBod)) {
                       gulka.nastavX(1);
                   }

                   if (tehly[i].dajObdlznik().contains(vrchnyBod)) {
                       gulka.nastavY(1);
                   }else if (tehly[i].dajObdlznik().contains(spodnyBod)) {
                       gulka.nastavSmerY(-1);

                   }
                   tehly[i].nastavZnicenu(true);

               }
           }
       }
   }



}
package hra;


import javax.swing.ImageIcon;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author david
 */
public class Tehla extends Obraz {
    private boolean znicena;


    public Tehla(int x, int y) {
        this.x = x;
        this.y = y;

        ImageIcon ii = new ImageIcon("Tehla.png");
        obrazok = ii.getImage();

        sirkaObrazka = obrazok.getWidth(null);
        vyskaObrazka = obrazok.getHeight(null);

        znicena = false;
    }

    public boolean znicenaTehla() {
        return znicena;
    }

    public void nastavZnicenu(boolean a) {
        this.znicena = a;
    }
}
 
Odpovědět 15. května 15:53
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B42P6
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B42P6:

Problém je v tom že atributy

private Gulka gulka ;

a

private Hrac hrac;

nie sú initializované atributy (majú hodnotu null). Ako tak pozerám inicializuješ ich v metode nastavenieHry(), ale túto metódu nikdy nezavoláš. Neskôr voláš metódy na týchto null objektoch v triede ScheduleTask:

public void run() {
           gulka.pohybGulky(); //gulka má hodnotu null, hodi to NullPointerException
           hrac.pohybHraca(); //hrac ma tiez hodnotu null, takze to tiez hodi NPE
           kolizie();
           repaint();
       }

Dúfam že na riešenie prídeš aj sám.

BTW: Nabudúce si skús sám zistiť čo znamená ten a ten error.

Editováno 15. května 18:56
Nahoru Odpovědět 15. května 18:56
'long long long' is too long for GCC
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