java-programmer >>Static fields accessed by getter/setter...what happens?

Static fields accessed by getter/setter...what happens?

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    #######################
    CODE BELOW
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    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    
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  - Bug#285014: java-common; correction for README.Debian-----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1
    
    Package: java-common
    Version: 0.222
    Severity: minor
    
    In the file /usr/share/doc/common-java/README.Debian, the following lines:
    
    They can be found at
    /usr/share/doc/java-common/debian-java-faq.html
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    License Manager Team.
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- 16
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    Thanks,
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- 16
  - Beanshell self-reference causes memory leakDear All,
    
    I have come across a phenomena in Beanshell, which I am pretty sure is
    a bug. I have put together a very simple test. I wanted to know if
    anyone has already come across this, before I submit a bug report.
    
    I have included below the source for a very simple test which can be
    run from the command line. Although the test prints out memory usage,
    the phenomena is best observed using a memory tool such a JProfiler.
    Unfortunately, I can't attach here a screen-shot from JProfiler to
    graphically illustrate the problem.
    
    The core issue is this:
    If I setup a self-referencing circle with the Interpreter like so (in
    standard Java code):
    {
    this.interpreter = new bsh.Interpreter();
    this.interpreter.set( "ref", this );
    }
    It sets up objects in the JVM memory which can never ever be garbage
    collected, even though there is no reference them, and the "this"
    object is out of scope in the calling method.
    
    This is in contrast to, say a HashSet:
    {
    this.set = new HashSet();
    onethis.set.add( this );
    }
    This setup does appear to garbage collect when the "this" object goes
    out of scope.
    
    The code for Test.java is below. Its output follows. Note that after
    the self-referencing setup, roughly 90Kb has not been garbage
    collected, compared with 20Kb for the HashSet and 200 bytes for two
    java objects.
    
    Before tests
    ------------
    10528
    40
    ------------
    Waiting ...
    
    After object ref test
    ---------------------
    26944
    208
    ---------------------
    Waiting ...
    
    After HashSet test
    ------------------
    158280
    22760
    ------------------
    Waiting ...
    
    After Interpreter test
    ----------------------
    362648
    91352
    ----------------------
    Waiting ...
    
    If this test is run with JProfiler, it can be seen that both the
    self-referencing Test objects, and the self-referencing HashSet setup
    are successfully garbage collected.
    
    But JProfiler shows the Interpreter still in memory after the object of
    class Test has gone out of scope - at the very final part of the
    program.
    
    The Interpreter is not garbage collected.
    Obviously, if you do this enough in an application, it will cripple it
    for speed and eventually bomb out with an "Out of heap space" error.
    
    Any thoughts?
    
    Regards,
    
    Stewart
    
    import java.io.*;
    import java.util.*;
    import bsh.*;
    
    public class Test
    {
    private static Runtime r = Runtime.getRuntime();
    private static long baseline = 0L;
    
    public static void main(String[] args)
    throws Exception
    {
    System.gc();
    baseline = (r.maxMemory() - r.freeMemory());
    
    report("Before tests");
    
    twoObjectTest();
    
    report("After object ref test");
    
    hashSetTest();
    
    report("After HashSet test");
    
    interpreterTest();
    
    report("After Interpreter test");
    }
    
    private Test ref = null;
    private HashSet<Test> s = null;
    private Interpreter i = null;
    
    private static void twoObjectTest()
    {
    Test one = new Test();
    Test two = new Test();
    
    one.ref = two;
    two.ref = one;
    }
    
    private static void hashSetTest()
    {
    Test one = new Test();
    
    one.s = new HashSet<Test>();
    one.s.add( one );
    }
    
    private static void interpreterTest()
    throws EvalError
    {
    Test one = new Test();
    
    one.i = new Interpreter();
    one.i.set( "ref", one );
    }
    
    private static void report(String string)
    throws IOException
    {
    char[] lines = new char[string.length()];
    Arrays.fill(lines, '-');
    System.out.println( );
    System.out.println( string );
    System.out.println( lines );
    System.out.println( (r.maxMemory() - r.freeMemory() - baseline) );
    System.gc();
    System.out.println( (r.maxMemory() - r.freeMemory() - baseline) );
    System.out.println( lines );
    System.out.println("Waiting ...");
    new BufferedReader( new InputStreamReader( System.in )).readLine();
    }
    
    /**
    * I thought this might solve the problem, but of course, it never
    gets called.
    */
    protected void finalize()
    throws Throwable
    {
    i.set( "ref", null );
    i.unset( "ref" );
    i = null;
    }
    }

Author

Message

stacnebben

Posted: 2004-2-10 22:06:00

Top

java-programmer, Static fields accessed by getter/setter...what happens? (apology for duplicate post, I felt I posted in the wrong forum earlier.)
Could someone please enlighten me as to what will happen if I have:

public class MyClass
{
public static String someName = null;

public void setSomeName(String s)
{
someName = s;
}

public void getSomeString()
{
return someString;
}
}

I'm not sure how the static field is being handle using non-static getters/setters.
Thanks
Stacey

Collin VanDyck

Posted: 2004-2-10 22:29:00

Top

java-programmer >> Static fields accessed by getter/setter...what happens? Well, the first response should be, "what happened when you tried it?".

Past that, your class instances do have access to static variables. As long
as you did not declare someName to be final, your instances can easily
change it. Be careful, though, about your setters -- if you are allowing
hundreds of instances to modify the same variable, you should probably
synchronize your setters.

That having been said, I would probably make my getters and setters also
static in this case.

Collin

"Stacey" <email***@***.com> wrote in message
news:email***@***.com...
> (apology for duplicate post, I felt I posted in the wrong forum earlier.)
> Could someone please enlighten me as to what will happen if I have:
>
> public class MyClass
> {
> public static String someName = null;
>
> public void setSomeName(String s)
> {
> someName = s;
> }
>
> public void getSomeString()
> {
> return someString;
> }
> }
>
> I'm not sure how the static field is being handle using non-static
getters/setters.
> Thanks
> Stacey

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    }
    
    //adding "Down" buttons
    for (int i=1, count=0; i < floors; i++, count++)
    {
    if (count == buttonPick)
    selected = true;
    else
    selected = false;
    
    buttons[count]= new Circle(n*2, n*i, selected, Math.round(n/2));
    }
    
    //build an array of "Up" circles
    for (int i=2, count=floors-1; i < floors+1; i++, count++)
    {
    if (count == buttonPick)
    selected = true;
    else
    selected = false;
    
    buttons[count]= new Circle(n, n*i, selected, Math.round(n/2));
    }
    
    }
    
    public static void main(String[] args)
    
    {
    new Elevator3();
    
    }
    
    protected void paintComponent(Graphics g)
    
    {
    super.paintComponent(g);
    
    //draw buttons
    for (int i=0; i < buttons.length; i++)
    {
    g.setColor(buttons[i].getColor());
    g.fillOval(buttons[i].getX(), buttons[i].getY(),
    buttons[i].getWidth(), buttons[i].getWidth());
    }
    
    }
    
    }
    
    class Circle
    {
    private int x;
    private int y;
    private Color c;
    private boolean pressed;
    private int width;
    
    public Circle(int xCoordinate, int yCoordinate, boolean selected,
    int diameter)
    {
    x = xCoordinate;
    y = yCoordinate;
    pressed = selected;
    width = diameter;
    
    if (pressed)
    c = Color.YELLOW;
    
    else
    c = Color.LIGHT_GRAY;
    
    }
    
    public Color getColor()
    {
    return c;
    }
    
    public int getX()
    {
    return x;
    }
    
    public int getY()
    {
    return y;
    }
    
    public int getWidth()
    {
    return width;
    }
    
    }
- 11
  - newbie: Global EJB and more ...
    Hi group,
    
    While thinking of how to transfer a tranditional client-server app
    into J2EE, I got following two questions:
    
    1, In a typical application, there should be some global (even
    singleton) objects which are created on application startup code and
    stay there until the program exiting. In the idiom of J2EE, what kind
    of Beans act like this kind of global object? And, when and how these
    global beans should be created?
    
    2, I knew Beans have to be deployed onto the server before they come
    to be available, but those Beans quit often need some objects to
    complete its job, these objects may encapsulate a algorithem, may do
    some management task, but they typically dont have to exposed to
    client tire or web tire. I call these objects are intermediate
    objects. My question is, should this kind of objects need to be a EJB?
    My J2EE books seems only to mention three kinds of Beans,
    SessionBeans, EntityBeans and MessageBeans. But what do I do for those
    intermediate objects?
    
    Thanks in advance.
    
    --
    email***@***.com
    
    %% (fortunes)
    Q: How did you get into artificial intelligence?
    A: Seemed logical -- I didn't have any real intelligence.
- 12
  - class not found within IEHi,
    
    I've written an applet. It properly works with Mozila. But with
    Internet Explorer it says "Class [the applet's name] not found" or
    something.
    What is the problem? How can I fix it?
    
    Thank you,
    Siamak
- 13
  - File upload with JSF.....Hi,
    i'm a new user of java. I have a question. I have to develop a JSF
    application that make user able to:
    
    1) Upload a txt file
    2) Showing to user columns and rows numbers of file.
    
    For this second operation i'have developed a java application that
    receive a txt file from a BufferedReader and counts rows and columns
    number.
    My questions are:
    
    1) How can i realize file upload with JSF?
    2) In which format a file is uploaded?
    3) Can i use my java application for counting rows and columns number
    of file?
    
    Can you help me?Please use easy concepts because i'm inexpert.....
- 14
  - JavaDoc Ignore TagsHi all,
    
    Is it possible to tel JavaDoc to ignore certain XDocLet tags, and/or not raise a warning that it is
    unknown?
    
    I am currently running JavaDoc through an Ant task, and wish to hide the warnings about my
    @hibernate tags.
    
    Regards,
    --
- 15
  - sample jsp servlet application requiredHi geeks,
    I'm a beginner in jsp and servlets, i want a sample JSP-SERVLET
    applicaton with source code. Can you please tell me where can i get the
    sample applications.
    Thanks in advance...