Thread Start is always running, is it normal?
Hello all,
Here is our system EP6 SP17, 1CI and 2servers and 2 instances by server.
I observed into the Monitoring/thread overview that on the CI and on the first instance of the servers the thread "EP:PRT:START" is always running since the last restart.
Could you tell me if it's normal and also why?
Thank you for your help.
Pino.
I'm not sure SAP have provided you with a very good answer. On our EP7 (NW2004s SP16) Portal we can observe similar activity against GUEST user for example:
Request Name User Response Time (ms) Gross CPU Time (ms) Total Components Status Start Time
EP:PRT:START Guest 92,326,295 663,510 2,500 26/11/2008 04:21
EP:PRT:START Guest 92,025,550 591,460 2,500 26/11/2008 12:04
EP:PRT:START Guest 92,010,389 650,390 2,515 26/11/2008 12:04
EP:PRT:START Guest 91,724,752 597,010 2,500 26/11/2008 12:04
EP:PRT:START Guest 91,717,756 600,290 2,500 26/11/2008 12:04
EP:PRT:START Guest 91,666,134 521,120 2,501 26/11/2008 12:04
If you look at the CPU time alone on these threads that's not going to help performance, anyway! You could get SAP to look at a Diagtool trace (sap note 1045019) to see exactly what these users are doing, or switch on JARM and look at the traces in /nwa on your portal.
Cheers,
Marc
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When my thread starts running, at that time keylistener is not working.
when my thread starts running, at that time keylistener is not working.
plz reply me.//FrameShow.java
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import java.awt.Dimension;
import java.awt.geom.Dimension2D;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.util.logging.Level;
import java.awt.event.*;
import java.util.*;
public class FrameShow extends JFrame implements ActionListener,KeyListener
boolean paused=false;
JButton stop;
JButton start;
JButton exit;
public IncludePanel CenterPanel;
public FrameShow()
CenterPanel= new IncludePanel();
Functions fn=new Functions();
int height=fn.getScreenHeight();
int width=fn.getScreenWidth();
setTitle("Game Assignment--Santanu Tripathy--MCA");
setSize(width,height);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
show();
initComponents();
DefaultColorSet();
this.addKeyListener(this);
this.setFocusable(true);
public void initComponents()
Container contentpane=getContentPane();
//Creating Panel For Different Side
JPanel EastPanel= new JPanel();
JPanel WestPanel= new JPanel();
JPanel NorthPanel= new JPanel();
JPanel SouthPanel= new JPanel();
//CenterPanel = new IncludePanel();
//IncludePanel CenterPanel= new IncludePanel();
EastPanel.setPreferredSize(new Dimension(100,10));
WestPanel.setPreferredSize(new Dimension(100,10));
NorthPanel.setPreferredSize(new Dimension(10,100));
SouthPanel.setPreferredSize(new Dimension(10,100));
//CenterPanel.setPreferredSize(new Dimension(200,200));
//Adding Color to the Panels
NorthPanel.setBackground(Color.green);
SouthPanel.setBackground(Color.orange);
CenterPanel.setBackground(Color.black);
//Creating Border For Different Side
Border EastBr = javax.swing.BorderFactory.createEtchedBorder(Color.cyan, Color.red);
Border WestBr = javax.swing.BorderFactory.createEtchedBorder(Color.cyan, Color.red);
Border NorthBr = javax.swing.BorderFactory.createEtchedBorder(Color.cyan, Color.red);
Border SouthBr = javax.swing.BorderFactory.createEtchedBorder(Color.cyan, Color.red);
Border CenterBr = javax.swing.BorderFactory.createEtchedBorder(Color.cyan, Color.red);
//Creating Components For East Panel
JLabel left= new JLabel("LEFT");
JLabel right= new JLabel("RIGHT");
JLabel rotate= new JLabel("ROTATE");
left.setForeground(Color.blue);
right.setForeground(Color.blue);
rotate.setForeground(Color.blue);
//Creating Components For West Panel
ButtonGroup group = new ButtonGroup();
JRadioButton rb1 = new JRadioButton("Pink",false);
JRadioButton rb2 = new JRadioButton("Cyan",false);
JRadioButton rb3 = new JRadioButton("Orange",false);
JRadioButton _default = new JRadioButton("Black",true);
rb1.setForeground(Color.pink);
rb2.setForeground(Color.cyan);
rb3.setForeground(Color.orange);
_default.setForeground(Color.black);
//Creating Components For North Panel
JLabel name= new JLabel("Santanu Tripathy");
name.setForeground(Color.blue);
name.setFont(new Font("Serif",Font.BOLD,30));
//Creating Components For South Panel
start = new JButton();
stop = new JButton();
exit = new JButton();
start.setToolTipText("Click this button to start the game");
start.setFont(new java.awt.Font("Trebuchet MS", 0, 12));
start.setText("START");
start.setBorder(javax.swing.BorderFactory.createCompoundBorder(javax.swing.BorderFactory.createEmptyBorder(3, 5, 3, 5), javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED)));
start.setMaximumSize(new java.awt.Dimension(90, 35));
start.setMinimumSize(new java.awt.Dimension(90, 35));
start.setPreferredSize(new java.awt.Dimension(95, 35));
if(paused)
stop.setToolTipText("Click this button to pause the game");
else
stop.setToolTipText("Click this button to resume the game");
stop.setFont(new java.awt.Font("Trebuchet MS", 0, 12));
stop.setText("PAUSE");
stop.setBorder(javax.swing.BorderFactory.createCompoundBorder(javax.swing.BorderFactory.createEmptyBorder(3, 5, 3, 5), javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED)));
stop.setMaximumSize(new java.awt.Dimension(90, 35));
stop.setMinimumSize(new java.awt.Dimension(90, 35));
stop.setPreferredSize(new java.awt.Dimension(95, 35));
exit.setToolTipText("Click this button to exit from the game");
exit.setFont(new java.awt.Font("Trebuchet MS", 0, 12));
exit.setText("EXIT");
exit.setBorder(javax.swing.BorderFactory.createCompoundBorder(javax.swing.BorderFactory.createEmptyBorder(3, 5, 3, 5), javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED)));
exit.setMaximumSize(new java.awt.Dimension(90, 35));
exit.setMinimumSize(new java.awt.Dimension(90, 35));
exit.setPreferredSize(new java.awt.Dimension(95, 35));
//Adding some extra things to the Panels
group.add(rb1);
group.add(rb2);
group.add(rb3);
group.add(_default);
//Adding Component into the Panels
EastPanel.add(left);
EastPanel.add(right);
EastPanel.add(rotate);
WestPanel.add(rb1);
WestPanel.add(rb2);
WestPanel.add(rb3);
WestPanel.add(_default);
NorthPanel.add(name);
SouthPanel.add(start);
SouthPanel.add(stop);
SouthPanel.add(exit);
//Adding Border Into the Panels
EastPanel.setBorder(EastBr);
WestPanel.setBorder(WestBr);
NorthPanel.setBorder(NorthBr);
SouthPanel.setBorder(SouthBr);
CenterPanel.setBorder(CenterBr);
//Adding Panels into the Container
EastPanel.setLayout(new GridLayout(0,1));
contentpane.add(EastPanel,BorderLayout.EAST);
WestPanel.setLayout(new GridLayout(0,1));
contentpane.add(WestPanel,BorderLayout.WEST);
contentpane.add(NorthPanel,BorderLayout.NORTH);
contentpane.add(SouthPanel,BorderLayout.SOUTH);
contentpane.add(CenterPanel,BorderLayout.CENTER);
//Adding Action Listeners
rb1.addActionListener(this);
rb2.addActionListener(this);
rb3.addActionListener(this);
_default.addActionListener(this);
exit.addActionListener(this);
start.addActionListener(this);
try
start.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
start.setEnabled(false);
CenterPanel.drawCircle();
catch(Exception e)
{System.out.println("Exception is attached with sart button exp = "+e);}
try
stop.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
paused=!paused;
if(paused)
start.setToolTipText("Click this button to resume the game");
stop.setText("RESUME");
else
start.setToolTipText("Click this button to pause the game");
stop.setText("PAUSE");
CenterPanel.pause();
catch(Exception e)
{System.out.println("Exception is attached with sart button exp = "+e);}
public void DefaultColorSet()
getContentPane().setBackground(Color.white);
public void actionPerformed(ActionEvent AE)
String str=(String)AE.getActionCommand();
if(str.equalsIgnoreCase("pink"))
CenterPanel.setBackground(Color.pink);
if(str.equalsIgnoreCase("cyan"))
CenterPanel.setBackground(Color.cyan);
if(str.equalsIgnoreCase("orange"))
CenterPanel.setBackground(Color.orange);
if(str.equalsIgnoreCase("black"))
CenterPanel.setBackground(Color.black);
if(str.equalsIgnoreCase("exit"))
System.exit(0);
public void keyTyped(KeyEvent kevt)
//repaint();
public void keyPressed(KeyEvent e)
System.out.println("here key pressed");
//CenterPanel.dec();
public void keyReleased(KeyEvent ke) {}
}//End of FrameShow.ja
//IncludePanel.java
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.Graphics.*;
import java.awt.Dimension;
import java.awt.geom.Dimension2D;
import java.util.*;
import java.util.logging.Level;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
public class IncludePanel extends JPanel implements Runnable
int x=0,y=0;
int color_1=0;
int color_2=1;
int start=0;
Thread th;
Image red,blue,green,yellow;
java.util.List image;
static boolean PAUSE=false;
public IncludePanel()
red= Toolkit.getDefaultToolkit().getImage("red.png");
blue= Toolkit.getDefaultToolkit().getImage("blue.png");
green= Toolkit.getDefaultToolkit().getImage("green.png");
yellow= Toolkit.getDefaultToolkit().getImage("yellow.png");
public void paintComponent(Graphics g)
super.paintComponent(g);
draw(g);
public void dec()
System.out.println("in dec method");
x=x+30;
public void draw(Graphics g)
g.setColor(Color.red);
int xx=0,yy=0;
for (int row=0;row<=12;row++)
g.drawLine(xx,yy,180,yy);
yy=yy+30;
xx=0;
yy=0;
for (int col=0;col<=6;col++)
g.drawLine(xx,yy,xx,360);
xx=xx+30;
if(color_1==0)
g.drawImage(red, x, y, this);
else if(color_1==1)
g.drawImage(blue,x, y, this);
else if(color_1==2)
g.drawImage(green,x,y, this);
else if(color_1==3)
g.drawImage(yellow,x,y, this);
x=x+30;
if(color_2==0)
g.drawImage(red, x, y, this);
else if(color_2==1)
g.drawImage(blue,x,y, this);
else if(color_2==2)
g.drawImage(green,x,y, this);
else if(color_2==3)
g.drawImage(yellow,x,y, this);
x=0;
public void drawCircle( )
th=new Thread(this);
th.start();
public void pause()
if(PAUSE)
th.resume();
PAUSE=false;
return;
if(!PAUSE)
PAUSE=true;
public synchronized void run()
Random rand = new Random();
Thread ani=Thread.currentThread();
while(ani==th)
if(PAUSE)
th.suspend();
if(y==330)
color_1 = Math.abs(rand.nextInt())%4;
color_2 = Math.abs(rand.nextInt())%4;
if(color_1==color_2)
color_2=(color_2+1)%4;
y=0;
else
y=y+30;
repaint();
try
Thread.sleep(700);
catch(Exception e)
}//End of run
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Why are the threads start and terminate randomly?
Hi there,
I got the program below. I am wondering why are the threads start and terminate randomly? Everytime, I run the program, it produces different results.
I know that these four threads have got same normal priority (should be 5), and under windows there is something called timeslice. Then these four threads rotate using this timeslice. How do we know what exactly the timeslice is in seconds? If the timeslice is fix, then why the results are ramdom?
Thanks in advance!
* To change this template, choose Tools | Templates
* and open the template in the editor.
package mythreadone;
* @author Administrator
public class MyThreadOne implements Runnable {
String tName;
Thread t;
MyThreadOne(String threadName) {
tName = threadName;
t = new Thread(this, tName);
t.start();
public void run() {
try {
System.out.println("Thread: " + tName);
Thread.sleep(2000);
} catch (InterruptedException e) {
System.out.println("Exception: Thread "
+ tName + " interrupted");
System.out.println("Terminating thread: " + tName);
public static void main(String args[]) {
// Why are the threads start and terminate randomly?
new MyThreadOne("1");
new MyThreadOne("2");
new MyThreadOne("3");
new MyThreadOne("4");
try {
Thread.sleep(10000);
// Thread.sleep(2000);
} catch (InterruptedException e) {
System.out.println(
"Exception: Thread main interrupted.");
System.out.println(
"Terminating thread: main thread.");
1. Firstly, I set in the main function:
Thread.sleep(10000);
and I run the program it gives:
Thread: 1
Thread: 4
Thread: 2
Thread: 3
Terminating thread: 1
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
Run it again, it gives:
Thread: 2
Thread: 4
Thread: 3
Thread: 1
Terminating thread: 2
Terminating thread: 1
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
And my question was why it outputs like this? It suppose to be:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 1
Terminating thread: 2
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
Why these four threads start and finish randomly each time I run the program? I use Windows, suppose there is a timeslice (i.e. 1 second), these threads have the same priority. Then the threads should start and finish in turn one by one. Am I right?
2. My second question is:
When I change the codes in the 'main' function into:
Thread.sleep(10000); -> Thread.sleep(2000);
it gives me the results like:
Thread: 1
Thread: 4
Thread: 3
Thread: 2
Terminating thread: main thread.
Terminating thread: 1
Terminating thread: 4
Terminating thread: 3
Terminating thread: 2
BUILD SUCCESSFUL (total time: 2 seconds)
Run it again:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: main thread.
Terminating thread: 4
Terminating thread: 2
Terminating thread: 1
BUILD SUCCESSFUL (total time: 2 seconds)
I tried several times. The main thread always terminates before or after the first child thread finished.
My question is why it doesn't output something like:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: main thread.
Terminating thread: 1
BUILD SUCCESSFUL (total time: 2 seconds)
or
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: 1
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 2 seconds)user13476736 wrote:
Yes, my machine has multi-core. Then you mean that if I got a one core machine the result should always be:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 1
Terminating thread: 2
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
???No.
>
How to explain my second quesiton then? Why the main thread always terminates before some of the child threads end? Thanks a lot. -
Question on java.lang.Thread "starting problems"
hi everybody
i've just little trouble running a tiny program which uses Threads.
maybe there's a misunderstanding from my side:
About my code:
01 public class MyThread extends Thread {
02
03 String any_string = null;
04
05 public MyThread(String param) {
06 any_string = param;
07 this.start();
08 }
09
10 public void run() {
11 while(!isInterrupted()) {
12 System.out.println(" > This Thread is running!");
13 // any other operation...
14 try {
15 sleep(1000);
16 }
17 catch(Exception e) {}
18 }
19 }This is a Thread's code similar to those you can find it in the java.lang.Thread Documentation or in the java Tutorial.
In my example I got a IllegalThreadStateException in codeline 07 which means (compare to java.lang.Thread Documentation) that the code tries to start the Thread while the Thread is still running.
I always thought a Thread will not start itself.
I thought (and that's the way, i red it in the documentation) that the constructor of a Thread only allocates the new Thead-Object.
But by constructing MyThread I got the descripted exception (i'm beginning to repeat myself...). The "funny" thing on this exception is that the Thread at least IS running but there could be no Object allocated
01 ...
02 /**
03 * construction of a new Object of the class MyThread.
04 * test will be auto-started by the MyThread constructor
05 */
06 MyThread test = new MyThread("any-string");
07 ...
08 test.anyMethodOfClassMyThread();This little code generates a java.lang.NullPointerException in line 08 (when trying to access the object of class MyThread). Even after the application exits (in case of this exception), the run()-Method of MyThread generates its Text-Output " > This Thread is running!". argh
Does anyone see my mistake / misunderstanding??
It's really frustrating if you are sitting in front of your pc and can't get the reason why your prog is generating that "bullshit" (ok... i know - it's only generatting the bullshit I told it to generate :( )
Any suggestions or ideas
thanks,
ThofWell now, I don't get a NullPointerException, when I try to call a method of MyThread. Here's your code, with slight modifications by me:
public class MyThread extends Thread {
String any_string = null;
public MyThread(String param) {
any_string = param;
this.start();
public String getAnyString(){
return any_string;
public void run() {
while(!isInterrupted()) {
System.out.println(" > This Thread is running!");
try {
sleep(1000);
catch(Exception e) {}
}To test the app I wrote this class:
public class TestMyThread {
public static void main(String[] args) {
MyThread temp = new MyThread("Hello World");
System.out.println(temp.getAnyString());
}Now it does print out the correct "Hello World".
Your other problem of the thread not shutting down is because it is not a daemon thread. To solve this you will need to add this Thread to a ThreadGroup and set the ThreadGroup as a Daemon group. (see ThreadGroup::setDaemon() )
Or you can put a little boolean in your while loop and break out when you change the value of the boolean. Then when you want to shut down you simply change the boolean
Hope this helps
-Philip -
Creating breakout game. Need help with thread starting.
Howdy. As the title says, I've got an assignment to make a breakout game. So far it's going alright, but I've run into a rather large snag...I can't get it to animate :P I've got my main applet, then I created a class heirarchy for the paddle, ball, and brick objects. For this question, lets just focus on the ball object.
This is my applet code so far (it is not even close to being done, so don't laugh :P )
import java.awt.*;
import javax.swing.*;
import java.util.*;
* Class BreakoutApplet - Plays a simple game of Breakout.
* @author Kris Nelson
* @version November 10, 2004
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protected Brick brick; // creates an object of class brick
protected Ball ball; // creates an object of class ball
protected Paddle paddle; // creates an object of class paddle
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protected Thread timer; // the thread which controls the animation for the applet
* Called by the browser or applet viewer to inform this JApplet that it
* has been loaded into the system. It is always called before the first
* time that the start method is called.
public void init()
// this is a workaround for a security conflict with some browsers
// including some versions of Netscape & Internet Explorer which do
// not allow access to the AWT system event queue which JApplets do
// on startup to check access. May not be necessary with your browser.
JRootPane rootPane = this.getRootPane();
rootPane.putClientProperty("defeatSystemEventQueueCheck", Boolean.TRUE);
createBricks(); // creates the games array of bricks
ball = new Ball(400, 400, 2, 2); // sets the values for the ball
paddle = new Paddle(300, 660, 2); // sets the values for the paddle
// !!!!!!! have tried placing ball.start() here
* Paint method for applet.
* @param g the Graphics object for this applet
public void paint(Graphics g)
// draws the background, border, and all the games objects
g.setColor(Color.lightGray); // sets the drawing color to light gray
g.fillRect(0, 0, 600, 700); // displays the game screens background
displayBorder(g); // displays the game screens border
displayBricks(g); // displays the array of bricks
ball.display(g); // displays the ball
paddle.display(g); // displays the paddle
* Creates the games array of bricks
public void createBricks()
int colorNumber = 1; // starts the color of the bricks at orange
double yPosition = 100; // starts the bricks y screen position at 100
for(int i = 0; i < 4; i++)
double xPosition = 12; // starts the bricks x screen position at 12
for(int j = 0; j < 8; j++)
if(colorNumber == 0)
colorNumber = 1; // sets the color of the bricks to orange
else
colorNumber = 0; // sets the color of the bricks to green
brickArray.add(brick = new Brick(xPosition, yPosition, colorNumber)); // adds a brick to the current container in the brick array
xPosition = xPosition + brick.getWidth(); // move the bricks x screen position to the next column
yPosition = yPosition + brick.getHeight(); // moves the bricks y screen position to the next row
if(colorNumber == 0)
colorNumber = 1; // sets the color of the bricks to orange
else
colorNumber = 0; // sets the color of the bricks to green
* Displays the game screens border
* @param g the Graphics object for this applet
public void displayBorder(Graphics g)
g.setColor(Color.black); // sets the drawing color to black
g.fillRect(0, 0, 600, 24); // draws a border on the top of the screen
g.fillRect(0, 0, 12, 700); // draws a border on the left of the screen
g.fillRect(588, 0, 12, 700); // draws a border on the right of the screen
* Displays the array of bricks on the screen
* @param g the Graphics object for this applet
public void displayBricks(Graphics g)
Brick currentBrick; // holds the brick data from the current ArrayList container
for(int i = 0; i < 32; i++)
currentBrick = (Brick)(brickArray.get(i)); // grabs the brick data from the current ArrayList container
currentBrick.display(g); // displays the current brick
* Called by the browser or applet viewer to inform this JApplet that it
* should start its execution. It is called after the init method and
* each time the JApplet is revisited in a Web page.
public void start()
if(timer == null)
timer = new Thread(this); // creates a new object of type Thread
timer.start(); // starts the new thread
running = true; // tells the program that the new thread is running
* Runs the code that controls the animation
public void run()
do{
repaint(); // redraws the screen
try{
timer.sleep(100); // puts the thread to sleep for 100 milliseconds
} catch(InterruptedException e) {running = false;}
// !!!!!!! have tried placing ball.start() here
} while(running);
timer = null; // destroys the timer thread
* Called by the browser or applet viewer to inform this JApplet that
* it should stop its execution. It is called when the Web page that
* contains this JApplet has been replaced by another page, and also
* just before the JApplet is to be destroyed.
public void stop()
running = false; // tells the program that the thread is now done
}These are the bits of code for my class heirarchy, just to (hopefully) make it easier to follow.
import java.awt.*;
* The parent class of all the games objects.
* @author Kris Nelson
* @version November 9, 2004
public class Sprite
protected double screenX, screenY; // stores the x and y location of the object
* Constructor for objects of class Sprite
* @param xPosition the initial x screen position
* @param yPosition the initial y screen position
public Sprite(double xPosition, double yPosition)
screenX = xPosition; // sets the initial x screen position
screenY = yPosition; // sets the initial y screen position
* Sets new x and y screen locations for an object
* @param newX the new x screen location
* @param newY the new y screen location
public void setScreenXY(double newX, double newY)
screenX = newX; // sets the new x screen location
screenY = newY; // sets the new y screen location
* Sends back the current x screen location
* @return the current x screen location
public double getScreenX()
return screenX; // returns the current x screen location
* Sends back the current y screen location
* @return the current y screen location
public double getScreenY()
return screenY; // returns the current y screen location
import java.awt.*;
* Parent class of any game object that moves.
* @author Kris Nelson
* @version November 9, 2004
public class MovingSprite extends Sprite implements Runnable
protected double speedX, speedY; // stores the speed of an object in the x and y directions
protected Thread timer; // the thread which controls animation for all moving objects
protected boolean running; // tells the program whether or not the thread is running
* Constructor for objects of class MovingSprite
* @param xPosition the initial x screen position
* @param yPosition the initial y screen position
* @param xSpeedValue the speed in the x direction
* @param ySpeedValue the speed in the y direction
public MovingSprite(double xPosition, double yPosition, double xSpeedValue, double ySpeedValue)
super(xPosition, yPosition); // passes the initial screen positions to Sprite
speedX = xSpeedValue; // sets the speed in the x direction
speedY = ySpeedValue; // sets the speed in the y direction
* Sends back the speed in the x direction
* @return the speed in the x direction
public double getSpeedX()
return speedX; // returns the speed in the x direction
* Sends back the speed in the y direction
* @return the speed in the y direction
public double getSpeedY()
return speedY; // returns the speed in the y direction
* Starts the thread in order to start animation
public void start()
if(timer == null)
timer = new Thread(this); // creates a new object of type Thread
timer.start(); // starts the new thread
running = true; // tells the program that the new thread is running
* Empty since the child objects have their own run methods
public void run()
* Stops the thread from running
public void stop()
running = false; // tells the program that the thread is now done
import java.awt.*;
* Creates a single ball who's purpose is to bounce around and destroy the bricks.
* @author Kris Nelson
* @version November 10, 2004
public class Ball extends MovingSprite
protected static final double BALL_WIDTH = 15; // sets the width of the ball
protected static final double BALL_HEIGHT = 15; // sets the height of the ball
* Constructor for objects of class Ball
* @param xPosition the initial x screen position
* @param yPosition the initial y screen position
* @param xSpeedValue the speed in the x direction
* @param ySpeedValue the speed in the y direction
public Ball(double xPosition, double yPosition, double xSpeedValue, double ySpeedValue)
super(xPosition, yPosition, xSpeedValue, ySpeedValue); // passes the initial screen positions and ball speeds to MovingSprite
// !!!!!!!! have tried placing timer.start() here
* Displays a ball onto the screen
* @param g the Graphics object for this applet
public void display(Graphics g)
g.setColor(Color.blue); // sets the balls color
g.fillOval((int)(screenX), (int)(screenY), (int)(BALL_WIDTH), (int)(BALL_HEIGHT)); // displays the ball
* Runs the code that controls the balls animation
public void run()
do{
try{
timer.sleep(100); // puts the thread to sleep for 100 milliseconds
} catch(InterruptedException e) {running = false;}
screenX = screenX + speedX;
screenY = screenY + speedY; // this is VERY SIMPLE BALL MOVEMENT FOR TESTING PURPOSES, WILL BE CHANGED LATER
} while(running);
}Sorry if that was too much code. I'm just trying to make this easier to follow.
I placed a // !!!!!!!!!!!!! comment in the places where I have tried starting the ball thread.
So basically, everything is running fine, except that I'm not at all sure of where to start the ball Thread, and thus can't start anything moving. If someone could tell me where I should be starting the thread, I would REALLY appriciate it. Thank you :D
- KrisSome advice.
1. the start method on the ball should be called from the start method on the applet and should in turn call the start method on the sprite's thread.
2. the run method of the Moveable sprite should have been declare abstract
3. don't implement borders manually. There's a java.awt.Border class for that.
4. probably, you don't want to have the game invoke each sprite by name; just make a big list of all the sprites and invoke all of them every time
5. do you really need provision for a non-circular ball? this isn't rugby.
6. I don't think you ever had a threading problem, just a display problem.
7. Don't write comments like this: ball.display(g); // displays the ballHere's my (even more simplified version):import java.awt.*;
import javax.swing.*;
import java.util.*;
* Class BreakoutApplet - Plays a simple game of Breakout.
* @author Kris Nelson, modified by Michael Lorton
* @version November 10, 2004
public class BreakoutApplet extends JApplet implements Runnable {
protected Ball ball;
protected Paddle paddle;
public boolean running; // tells the program whether or not the thread is running
protected Thread timer; // the thread which controls the animation for the applet
public void init() {
// this is a workaround for a security conflict with some browsers
// including some versions of Netscape & Internet Explorer which do
// not allow access to the AWT system event queue which JApplets do
// on startup to check access. May not be necessary with your browser.
getRootPane().putClientProperty("defeatSystemEventQueueCheck",
Boolean.TRUE);
ball = new Ball(this, GAMEWIDTH / 2, GAMEHEIGHT / 2, 5, 5);
public final static int GAMEWIDTH = 600;
public final static int GAMEHEIGHT = 400;
public void paint(Graphics g) {
g.setColor(Color.lightGray);
g.fillRect(0, 0,
GAMEWIDTH, GAMEHEIGHT);
ball.display(g); // displays the ball
* Called by the browser or applet viewer to inform this JApplet that it
* should start its execution. It is called after the init method and
* each time the JApplet is revisited in a Web page.
public void start() {
if(timer == null) {
timer = new Thread(this); // creates a new object of type Thread
timer.start(); // starts the new thread
running = true; // tells the program that the new thread is running
ball.start();
* Runs the code that controls the animation
public void run() {
do{
repaint(); // redraws the screen
try{
Thread.sleep(100);
} catch(InterruptedException e) {running = false;}
} while(running);
public void stop() {
running = false;
abstract class Sprite {
protected double screenX, screenY; // stores the x and y location of the object
protected final BreakoutApplet parent;
* Constructor for objects of class Sprite
* @param xPosition the initial x screen position
* @param yPosition the initial y screen position
public Sprite(BreakoutApplet parent, double xPosition, double yPosition) {
this.parent = parent;
screenX = xPosition; // sets the initial x screen position
screenY = yPosition; // sets the initial y screen position
* Sets new x and y screen locations for an object
* @param newX the new x screen location
* @param newY the new y screen location
public void setScreenXY(double newX, double newY) {
screenX = newX; // sets the new x screen location
screenY = newY; // sets the new y screen location
* Sends back the current x screen location
* @return the current x screen location
public double getScreenX() {
return screenX; // returns the current x screen location
* Sends back the current y screen location
* @return the current y screen location
public double getScreenY() {
return screenY; // returns the current y screen location
abstract public void display(Graphics g);
* Parent class of any game object that moves.
* @author Kris Nelson
* @version November 9, 2004
abstract class MovingSprite extends Sprite implements Runnable {
protected double speedX, speedY; // stores the speed of an object in the x and y directions
protected Thread timer; // the thread which controls animation for all moving objects
protected boolean running; // tells the program whether or not the thread is running
* Constructor for objects of class MovingSprite
* @param xPosition the initial x screen position
* @param yPosition the initial y screen position
* @param xSpeedValue the speed in the x direction
* @param ySpeedValue the speed in the y direction
public MovingSprite(BreakoutApplet parent,
double xPosition, double yPosition,
double xSpeedValue, double ySpeedValue) {
super(parent, xPosition, yPosition);
speedX = xSpeedValue; // sets the speed in the x direction
speedY = ySpeedValue; // sets the speed in the y direction
* Starts the thread in order to start animation
public void start() {
if(timer == null) {
timer = new Thread(this); // creates a new object of type Thread
timer.start(); // starts the new thread
running = true; // tells the program that the new thread is running
* Runs the code that controls the balls animation
public void run() {
while (parent.running) {
try{
Thread.sleep(100);
} catch(InterruptedException e) {
System.err.println(e);
step();
abstract protected void step();
* Creates a single ball whose purpose is to bounce around and destroy the bricks.
* @author Kris Nelson
* @version November 10, 2004
class Ball extends MovingSprite {
protected static final int BALL_DIAMETER = 15;
* Constructor for objects of class Ball
* @param xPosition the initial x screen position
* @param yPosition the initial y screen position
* @param xSpeedValue the speed in the x direction
* @param ySpeedValue the speed in the y direction
public Ball(BreakoutApplet parent,
double xPosition, double yPosition,
double xSpeedValue, double ySpeedValue) {
super(parent, xPosition, yPosition, xSpeedValue, ySpeedValue);
* Displays a ball onto the screen
* @param g the Graphics object for this applet
public void display(Graphics g) {
g.setColor(Color.blue);
g.fillOval((int)(screenX),
(int)(screenY),
BALL_DIAMETER, BALL_DIAMETER);
protected void step() {
screenX = screenX + speedX;
if (screenX < 0) {
screenX = -screenX;
speedX = -speedX;
else if ((screenX + BALL_DIAMETER)> BreakoutApplet.GAMEWIDTH) {
screenX = 2*(BreakoutApplet.GAMEWIDTH - BALL_DIAMETER) - screenX;
speedX = -speedX;
screenY = screenY + speedY;
if (screenY < 0) {
screenY = -screenY;
speedY = -speedY;
else if ((screenY + BALL_DIAMETER) > BreakoutApplet.GAMEHEIGHT) {
screenY = 2*(BreakoutApplet.GAMEHEIGHT - BALL_DIAMETER) - screenY;
speedY = -speedY;
} -
MyThread t = new MyThread(j);
// much later in the flow of control
t.mustEnvokeThisForThreadToRunCorrectly(someString);
t.mustAlsoEnvokeThisForThreadToRunCorrectly(new Integet(abc));
t.start();
PROBLEM
i do not know the values for
t.mustEnvokeThisForThreadToRunCorrectly("required string value");
t.mustAlsoEnvokeThisForThreadToRunCorrectly(new Integet(876));until after i construct MyThread.......... and
i do not want to rely on the programmer to remember
to envoke:
t.mustEnvokeThisForThreadToRunCorrectly("required string value");
t.mustAlsoEnvokeThisForThreadToRunCorrectly(new Integet(876));before envoking
t.start();
SO i got out the hack saw and wrote:
public void run(String startDate, String endDate) {
this.startDate = startDate;
this.endDate = endDate;
this.startThread = true;
this.start();
public void run() {
if(this.startThread) {
}and then in javadoc i say:
"please don't start MyThread the normal way
(even though it subclasses Thread.
somebody, please set me straight on best practices
way to deal with this.
thanks.right.
but, i must follow this sequence:
(1) construct 50 MyThread objects.
// i cannot wait to construct them
(2) stuff each into same container.
(3) do lots of calculations.
(4) generated 50 doubles based on calculations in step #3.
(5) assign the 50 Threads one of each of the 50 doubles
(6) start all the Threads.
1 starting MyThread without a double
assigned to it makes the thread useless.
2 the construction MUST happen way before i known the instance variables that are required for the thread to run. (so you can't put the required values in the constructor). -
Msi Ge70 onc fan always running.
I bought the MSI GE70 ONC gaming laptop on laptopsdirect.co.uk
Laptop came in original package. I was happy.. until I started it.
From first use laptop was very noisy. Fan is working with high speed even when during typing emails or preforming simple tasks.
The fan is always running on 100% efficiency even when I start up the laptop. It doesn't want to stop unless I wait for about 40 mins without preforming any task on the computer.
This is really annoying. I never had an issue like that before.
I am dissapointed with this laptop. I understand that if I run high demanding software the fan will work loudly, but not during web surfing.
Otherwise the laptop is great. I mainly bought this laptop for video edition and I expected better quality for 977 euros I paid for this laptop.
I also have a video on how the fan is working, here is the link below.
tinypic(dot com)/r/2mh7sy1/6
Should the fan be working like this?
If this isnt normal what should I do?
I also rang msi and a woman said to email msi about this but I send msi 2 emails and they didnt respond ;(When I turn on the laptop the fan goes to 100% and after about 30 mins the laptop's fanstop.
When I launch not heavy applications like internet explorer or wordpad the fan turns on for 20 seconds and stops.
I even had a case when I right clicked on the desktop the fan started working.
No affence but i could just pay 50€ and buy another laptop.
About 1 month ago I had problems with windows 8 and had to reinstall windows twice. ;( -
How Can I Run A SQLJ Normal Project In SAP NWDS
I have a question about SQLJ in SAP NWDS.
1.I created a java dictionary project,and then create the table , then depoly it.it's ok.
2.I created a java normal project including the above java dictionary project.
3.I used the SQLJ tech in the java normal project,exporting the opensqllib.jar,sqljapi.jar,sqljc.jar,sqljimpl.jar.
4.I coded the normal project,and export the project .jar,everything is ok.
<b>5.But when i runed the project in NWDS,the error appeared:java.lang.NoClassDefFoundError: com/sap/sql/log/OpenSQLException
at com.ezkj.deom.sqlj.MainApp.main(MainApp.java:21)
Exception in thread "main"</b>
How Can I Run A SQLJ Normal Project In SAP NWDS?
PLS Help me and don't let me alone!Tony,
Why not try to import your SQLJ project in SAP NWDS. Add all the jars mentioned to the project path both for compile time as well as runtime. Now try running he project. Once you are able to bypass java.lang.NoClassDefFoundError, you will get other errors related to SQL statements. These Oracle SQL statements needs to be converted to OpenSQL format.
Chill out!!!
Sukanta Rudra
Note: If helpful, plz donate some points. -
Mac get hangs or frozen on start Up always
Hi,
The problem occurs after, when I have updated my mac mini to 10.8.4, when mac start it always hangs up and its mouse dosen't work, what i need to do then is to press power button to take machine in sleep mode, then again I need to press power button to wake up machine. After this it works normally.
But Apple products should not provide such kind of updates. Your team should provide some solutions.
Let me know if you can check my machine by taking it on remote.
I have purchase machine in Nov 2012. And I am very disappointed with the latest update. It is very bad. You guys should help to solve this problem
Regards,
Moiz.Hello Moiz,
We're just other users here trying to help, you can call Apple to try to get it fixed, but might try this...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
If that doesn't help Reinstall the OS.
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