Question

// Here’s my code:

Main Class:

import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.awt.image.BufferStrategy;
import javax.swing.JFrame;
public class Display extends Canvas implements Runnable{
    Toolkit toolkit = Toolkit.getDefaultToolkit();
    Dimension dim = toolkit.getScreenSize();
    public static int WIDTH;
    public static int HEIGHT;
    public static final String title = "First Person Game";
    public static Thread thread;
    public static Screen screen;
    public static  BufferedImage img;
    public static boolean running = false;
    public static int[] pixels;
    public static Render render;
    public Display(){
        WIDTH = dim.width;
        HEIGHT = dim.height;
        screen = new Screen(WIDTH, HEIGHT);
        img = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
        pixels = ((DataBufferInt)img.getRaster().getDataBuffer()).getData();
    }
    private void start(){
        if(running){
            return;
        }else{
            running = true;
            thread = new Thread(this);
            thread.start();
        }
    }
    private void stop(){
        if(!running){
            return;
        }else{
            running = false;
            try{
                thread.join();
            }catch(Exception x){
                System.exit(0);
            }
        }
    }
    public void run(){
        while(running){
            render();
        }
    }
    public void render(){
        BufferStrategy bs = this.getBufferStrategy();
        if(bs == null){
            createBufferStrategy(3);
            return;
        }
        screen.render();
        for(int i = 0; i < WIDTH * HEIGHT; i++){
            pixels[i] = screen.pixels[i];
        }
        Graphics g = bs.getDrawGraphics();
        g.drawImage(img, 0, 0, WIDTH, HEIGHT, null);
        g.dispose();
        bs.show();
    }
    public static void main(String args[]){
        JFrame frame = new JFrame();
        BufferedImage cursorImg = new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB);
        Cursor blankCursor = Toolkit.getDefaultToolkit().createCustomCursor(cursorImg, new Point(0, 0), "blank cursor");
        frame.getContentPane().setCursor(blankCursor);
        Display game = new Display();
        frame.setUndecorated(true);
        frame.add(game);
        frame.setTitle(title);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(WIDTH, HEIGHT);
        frame.setLocationRelativeTo(null);
        frame.setResizable(false);
        frame.setVisible(true);
        fps f = new fps();
        game.start();
    }
}



The class I need to call:

public class fps{
    public void fps(){
        System.out.println("Test 1 successful.");
        int frames = 0;
        double unprocessedSeconds = 0;
        long previousTime = System.nanoTime();
        double secondsPerTick = 1 / 60.0;
        int tickCount = 0;
        boolean ticked = false;
        Display c = new Display();
        System.out.println("Test 2 successful.");
        c.render();
        long currentTime = System.nanoTime();
        long passedTime = currentTime - previousTime;
        previousTime = currentTime;
        unprocessedSeconds += passedTime / 1000000000.0;
        while(unprocessedSeconds > secondsPerTick){
            System.out.println("Test 3 successful.");
            tick();
            unprocessedSeconds -= secondsPerTick;
            ticked = true;
            tickCount++;
            if(tickCount % 60 == 0){
                System.out.println(frames + " fps");
                previousTime += 1000;
                frames = 0;
            }
        }
        if(ticked){
            c.render();
            frames++;
        }
        c.render();
        frames++;
    }
    public void tick(){}
}

/* I don’t know how to do this, I’ve been trying all sorts of things. I basically need *to make sure fps is printing into the console while display is running. I can’t seem to so */ this. I tried in method run() but it just wouldn’t call it.

Answer 1

I beleive you need to create an instance of the fps class in your main class, and then call the method through it.

fps nameOfClassInstance = new fps(//don't forget anything you need to send for constructor);
fps.run();

At least this is how it is in C# which I know is very similar to java.

if this doesn’t help,then I beleive it is a threading issue, and you need to make sure you are handling the threads properly. ( I can’t help with this issue, I am still green to java threading.)