Uploading project

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-13">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Pong with Frames</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=13
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=13
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=13

src/Ball.java

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+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+
+import javax.swing.JFrame;
+
+public class Ball extends JFrame implements KeyListener {
+
+	private static final long serialVersionUID = -629144081400642128L;
+
+	private float speed = 0.0000003f;
+
+	private float xPos = 300;
+	private float yPos = 300;
+	public int xSize = 100;
+	public int ySize = 100;
+
+	public boolean leftUp;
+	public boolean leftDown;
+
+	public boolean rightUp;
+	public boolean rightDown;
+
+	public Ball() {
+
+		this.addKeyListener(this);
+		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		this.setVisible(true);
+
+	}
+
+	public void keyTyped(KeyEvent e) {
+
+	}
+
+	public void keyPressed(KeyEvent e) {
+		if (e.getKeyCode() == 87) {
+			leftUp = true;
+			leftDown = false;
+		} else if (e.getKeyCode() == 83) {
+			leftDown = true;
+			leftUp = false;
+		}
+		if (e.getKeyCode() == 38) {
+			rightUp = true;
+			rightDown = false;
+		} else if (e.getKeyCode() == 40) {
+			rightDown = true;
+			rightUp = false;
+		}
+		delay(10);
+	}
+
+	public void keyReleased(KeyEvent e) {
+
+		if (e.getKeyCode() == 87) {
+			leftUp = false;
+		} else if (e.getKeyCode() == 83) {
+			leftDown = false;
+		}
+
+		if (e.getKeyCode() == 38) {
+			rightUp = false;
+		} else if (e.getKeyCode() == 40) {
+			rightDown = false;
+		}
+
+	}
+
+	public int getPos(char coordinate, long dt) {
+
+		if (coordinate == 'x') {
+			return (int) xPos;
+		} else if (coordinate == 'y') {
+			return (int) yPos;
+		} else
+			return 0;
+	}
+	
+	public void delay(int time) {
+
+		try {
+			Thread.sleep(time);
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
+	}
+
+}

src/Game.java

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+
+public class Game {
+
+	Ball ball;
+
+	// Delta time: siehe https://en.wikipedia.org/wiki/Delta_timing
+	private long dt;
+	private long lastT;
+
+	private Player leftPlayer;
+	private Player rightPlayer;
+
+	public Game() {
+
+		ball = new Ball();
+
+		leftPlayer = new Player();
+		rightPlayer = new Player();
+
+		ball.setSize(ball.xSize, ball.ySize);
+
+		leftPlayer.setSize(0, leftPlayer.ySize);
+		leftPlayer.setLocation(leftPlayer.xPos, leftPlayer.getPos(0, false, false));
+		leftPlayer.setTitle("left Player");
+		
+		rightPlayer.xPos = 1000;
+		rightPlayer.setSize(0, rightPlayer.ySize);
+		rightPlayer.setLocation(rightPlayer.xPos, rightPlayer.getPos(0, false, false));
+		rightPlayer.setTitle("right Player");
+		
+		ball.setLocation(ball.getPos('x', dt), ball.getPos('y', dt));
+
+		lastT = System.nanoTime(); // delta time
+
+		while (true) {
+
+			dt = System.nanoTime() - lastT; // delta time
+			lastT = System.nanoTime(); // delta time
+
+			leftPlayer.setLocation(10, leftPlayer.getPos(dt, ball.leftUp, ball.leftDown));
+			
+			rightPlayer.setLocation(rightPlayer.xPos, rightPlayer.getPos(dt, ball.rightUp, ball.rightDown));
+
+			// ball.setLocation(ball.getPos('x', dt), ball.getPos('y', dt));
+
+			// ball.leftPlayer.setLocation(10, 700);
+			// ball.xPos++;
+			
+			//System.out.println(ball.leftDown + "    " + ball.leftUp);
+
+		}
+
+	}
+
+}

src/Main.java

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+
+public class Main {
+
+	public static void main(String[] args) {
+		
+		Game game = new Game();
+
+	}
+
+}

src/Player.java

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+import javax.swing.JFrame;
+
+public class Player extends JFrame {
+
+	private static final long serialVersionUID = -6213278730749915732L;
+
+	public float speed = 0.0000003f;
+
+	public int xPos = 10;
+	public double yPos = 100;
+	public int xSize = 100;
+	public int ySize = 200;
+
+	public Player() {
+
+		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		this.setVisible(true);
+
+	}
+
+	public int getPos(long dt, boolean up, boolean down) {
+		System.out.println(yPos);
+		
+		if(up) {
+			yPos -= speed * dt;
+		} else if(down) {
+			
+			yPos += speed * dt;
+		}
+		return (int) yPos;
+	}
+
+}