Answered: lease help me fix the errors in the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Please help me fix the errors in the java program below. There are two class AnimatedBall and BouncingBall

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class AnimatedBall extends JFrame implements ActionListener

{

private Button btnBounce; // declare a button to play

private TextField txtSpeed; // declare a text field to enter

private Label lblDelay;

private Panel controls; // generic panel for controls

private BouncingBall display; // drawing panel for ball

Container frame;

public AnimatedBall ()

{

// Set up the controls on the applet

frame = getContentPane();

btnBounce = new Button ("Bounce Ball");

//create the objects

txtSpeed = new TextField("10000", 10);

lblDelay = new Label("Enter Delay");

display = new BouncingBall();//create the panel objects

controls = new Panel();

setLayout(new BorderLayout()); // set the frame layout

controls.add (btnBounce); // add controls to panel

controls.add (lblDelay);

controls.add (txtSpeed);

frame.add(controls, BorderLayout.NORTH);

// add panel to top

frame.add(display, BorderLayout.CENTER);

//add panel to center

btnBounce.addActionListener(this);

//add action listener

setSize(450,500);

setVisible(true);

} // init method

public void paint (Graphics g)

{

// paint no longer used

// we are not painting on the JFrame - remove

} // paint method

public void actionPerformed (ActionEvent e)

{

long speed;

speed = Long.parseLong(txtSpeed.getText());

//read text field

if (e.getSource() == btnBounce)

{

display.draw(speed);

}

} // action method

}

BouncingBall.java

import java.awt.*;

public class BouncingBall extends Panel

{

private long delay;

// Overridden paint method for painting the BouncingBall panel

public void paint( Graphics g )

{

super.paint( g ); // calls paint method from Panel.

int radius = (getSize().width/10)/2;

int Z = getSize().height/2 - radius;

int X = (int)(Math.random()*(getSize().width)) + radius;

int Y = (int)(Math.random()*(getSize().height)) + radius;

int dy = 1;

for (int count = 0; count < 1000 ;count++ )

{

g.setColor(getBackground());

//get the panel background color to erase

g.drawOval(X, Y, 2*radius, 2*radius);

if (Y<=0 || Y>=(getSize().height)- 2*radius)

{

dy = -dy;

}

Y += dy;

g.setColor( Color.BLUE );

g.fillOval(X, Y, 2*radius, 2*radius);

try

{

Thread.sleep(delay);

}

catch (InterruptedException ex)

{

}

}

}

// method to set delay value and draw the BouncingBall Panel

public void draw(long d)

{

this.delay = d;

repaint();

}

} // end class BouncingBall

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