This is the bouncing balls work

.classpath

+<?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-11">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.gitignore

+/bin/

.project

+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Bouncing Balls</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

+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=11
+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.enumIdentifier=error
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=11

src/BouncingBalls.java

+import javafx.application.*;
+import javafx.stage.*;
+import javafx.scene.*;
+import javafx.scene.paint.*;
+import javafx.scene.canvas.*;
+import javafx.scene.shape.*;
+import javafx.animation.*;
+import java.util.*;
+
+public class Bounce extends Application {
+    /** Boilerplate method to get JavaFX going */
+    public static void main(String[] args) {
+        launch(args);
+    }
+    
+    /** Width of our screen in pixels */
+    private final int width = 1024;
+    /** Height of our screen in pixels */
+    private final int height = 768;
+    /** Canvas that we will draw things on */
+    private Canvas canvas = new Canvas(width, height);
+    /** Time when the last frame was drawn, in nanoseconds */
+    private long last = 0;
+    
+    int xspeed = 1;
+    int x =0;
+	
+	int yspeed = 1;
+	int y =0;
+	
+	
+    
+    /** Set up anything that is needed later */
+    private void setup() {
+    	
+
+    
+
+    }
+
+    /** Draw a frame.
+     *  @param elapsed Time in seconds since the last frame was drawn.
+     */
+    private void draw(GraphicsContext gc, double elapsed, int x, int y) {
+        gc.setFill(Color.BLUE);
+       
+        gc.fillOval(x, y, 20,20);
+      
+        gc.setFill(Color.RED);
+        
+        gc.fillOval(x+100, y+100, 20,20);
+      
+        
+        
+        
+    }
+
+    /** Set up the window and the timer */
+    public void start(Stage stage) {
+        /* Make the JavaFX scene */
+        Group root = new Group();
+        Scene scene = new Scene(root, width, height, Color.WHITE);
+        root.getChildren().add(canvas);
+        stage.setScene(scene);
+        stage.show();
+        
+       
+
+        setup();
+
+        /* Set up a timer to update the screen every frame */
+        new AnimationTimer() {
+            public void handle(long now) {
+                if (last == 0) {
+                    last = now;
+                 
+                }
+             
+              
+                
+                x+=xspeed;
+                
+                y+=yspeed;
+                
+                
+                if(width > x) {
+                	
+                	y-=yspeed;	
+                }
+                
+                else {
+                	if(height>y) {
+                		
+                		x-=xspeed;
+                		
+                	}
+                }
+                
+                if(height < x) {
+                	
+                	y+=yspeed;
+                
+                }
+                else
+                {
+                	if(width < y) {
+                		
+                		x+=xspeed;
+                		
+                	}
+                }
+              
+                
+                
+                
+                /* Get a context and clear the window */
+                GraphicsContext gc = canvas.getGraphicsContext2D();
+                gc.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());
+
+                /* Update things */
+                draw(gc, (now + last) * 1e-9, x ,y);
+                last = now;
+            }
+        }.start();
+    }
+}