How do you draw anything in the "Canvas` windows `JFrame` using `BufferStrategy`?

[tahishae]

How to draw anything in the object Canvas windows JFrame Applicable BufferStrategy?

[Raziyah00]

Examples of mass, the only thing:

package testframe;
import java.awt.Canvas;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.image.BufferStrategy;
import javax.swing.JFrame;
public class Testframe extends Canvas implements Runnable {
//FIELDS
private static final long serialVersionUID = 1L;
public static int WIDTH = 1024;
public static int HEIGHT = WIDTH / 16 * 9;
private JFrame frame;
private boolean running;
private Thread t1;


public Testframe(){
    Dimension size = new Dimension(WIDTH, HEIGHT);
    setPreferredSize(size);
    frame = new JFrame();
}


public synchronized void start (){
    running = true;
    t1 = new Thread (this);
    t1.start(); // calls run()
}


//Main runnable
public void run(){
    while (running){   
       update();
       draw();
    }
}


public void update(){}


public void draw(){
   BufferStrategy bs = getBufferStrategy();
   if (bs== null){
        createBufferStrategy(3);
        return;
   }

   Graphics g = bs.getDrawGraphics();
   g.setColor(Color.BLACK);
   g.fillOval(0, 0, 20, 20);
   g.dispose();
   bs.show();
}

public static void main(String[] args){
    Testframe myPanel = new Testframe();

    myPanel.frame.setResizable(false);
    myPanel.frame.setTitle("My frame");
    myPanel.frame.add(myPanel);
    myPanel.frame.pack();
    myPanel.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    myPanel.frame.setLocationRelativeTo(null);
    myPanel.frame.setVisible(true);

    myPanel.start();
}

}

_{Example with https://stackoverflow.com/questions/17770830/java-buffer-strategy-learning}