Compile questions about example " DrawTest.java"

i install the j2sdk1.4.0 with windows98 operations system.
i want to recomplie the examples in c:\j2sdk1.4.0\demo\applets\DrawTest
javac DrawTest.java
12 errors occur as following:
DrawTest.java:185: cannot resolve symbol
symbol : variable orange
location: class Color
b.setForeground(Color.orange);
^
DrawTest.java:188: cannot resolve symbol
symbol : variable black
location: class Color
b.setForeground(Color.black);
^
DrawTest.java:194: cannot resolve symbol
symbol : variable lightGray
location: class Color
shapes.setBackground(Color.lightGray);
^
DrawTest.java:200: cannot resolve symbol
symbol : variable lightGray
location: class Color
g.setColor(Color.lightGray);
^
12 errors
how to solve this problem?
thanks a lot

Normally problems regarding cannot resolve symbol I've found are because the file you're working on uses another class file in the code, and the compiler from the prompt doesn't know where it's looking for the dependant classes. When compiling try using "javac -classpath "c:\whereyourclassesare" "c:\whereyourjavafileis.java""
That should work, hopefully :)

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Hi every one,
I have a question about design of Java applet on java card,
There is an application on my card that it is not java card, it include a DF and some EF under DF, I would like to know if I want to have this application on java card ,how can I design DF and EF on java card ,I mean is there any relation between DF,EF with applet and file? for example can I say DF is same as applet and EF is same as file?
I'll appreciate for any help .
yours sincerely,
orchid

hi
you can write a java class for DF.
an instance of DF class have some EF objects.
for example,
samples/com/sun/javacard/samples/JavaPurse/CyclicFile.java
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see also:
http://forum.java.sun.com/thread.jspa?threadID=673745&messageID=3936272
best regards,
siavash

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However, when I program in Java
i find that most of the time I am making my variables
global. (meaning public)Sounds like you are writing bad code. Public variables should be extrememly rare except static final 'constants'.
Is the fact that they are in a class supposed
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With subclasses you can also
have 3rd parties working on your data. It seems a bit
suspicious to me, like the data should be maintained
more strictly, or is it my job to do that? Yes, it's your job.
I am just
curious, but it seems java promotes global variables,
which I find to be bad programming practice since
anything can operate on them. I appreciate any
input...Java does not promote public variables. You have to explicitly make them public.

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My brother is a phycisist. He has no use for Java.I don't see why a physicist would look down his nose at Java. They write code, too.
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Question on example from "Java concurrency in practice"

"Java concurrency in practice" 14.9 listing ( [Orig here|http://www.javaconcurrencyinpractice.com/listings/ThreadGate.java] ):
+...The condition predicate used by await is more complicated than simply testing isOpen. This is needed because if N threads are waiting at the gate at the time it is opened, they should all be allowed to proceed. But, if the gate is opened and closed in rapid succession, all threads might not be released if await examines only isOpen: by the time all the threads receive the notification, reacquire the lock, and emerge from wait, the gate may have closed again. So ThreadGate uses a somewhat more complicated condition predicate: every time the gate is closed, a "generation" counter is incremented, and a thread may pass await if the gate is open now or if the gate has opened since this thread arrived at the gate...+
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Guys, could anyone explain me
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I posted this in other forums, but never had any explanations. Thanks.
Edited by: maxim_2004 on Jul 14, 2010 9:19 AM

Generation is a counter of how many times the gate has opened. We use it to determine if the gate has opened since a waiting thread arrived. The criteria for a waiting thread to proceed is not, "Is the gate open now?" but rather "Has the gate opened at least once since this thread started waiting?"
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Gate closes.
Gate opens 2nd time. (gen = 2)
T2 arrives. (arrivalGen = 2)
T2 calls wait()
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Gate closes.
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Edited by: jverd on Jul 14, 2010 10:05 AM
Edited by: jverd on Jul 14, 2010 10:08 AM

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Imagine for example the javax.swing.border.Border hierarchy.
I'm writing a BorderEditor for some gui builder, so I need a function that takes a Border instance and returns the Java code. Here is my first try:
1 protected String getJavaInitializationString() {
2     Border border = (Border)getValue();
3     if (border == null)
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5
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8
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10 private String getCode(EmptyBorder border) {...}
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13
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Too bad! I'm doing some thing wrong?
Thank in advance
Quique.-
PS: Sorry about my english! it's not very good! Escribo mejor en espa�ol!

Hi, your spanish is quite good!
getCode(...) returns the Java code for the given border.
So getCode(BevelBorder border) returns a Java string that is something like this "new BevelBorder()".
I want Java to resolve the method to call.
For example: A1, A2 and A3, extends A.
public void m(A1 a) {...}
public void m(A2 a) {...}
public void m(A3 a) {...}
public void m(A a) {...}
public void p() {
    A a = (A)getValue();
    // At this point 'a' could be instance of A1, A2 or A3.
    m(a); // I want this method call, to call the right method.
}This did not work. So, i've used instead of m(a):
    m(a.getClass().cast(a));Didn't work either. Then:
    m(A.class.asSubClass(a.getClass()).cast(a));No luck! But:
    m(A1.class.cast(a)); // idem m((A1)a);Woks for A1!
I don't know why m(A1.class.cast(a)) works and m(a.getClass().cast(a)) doesn't!
thanks for replying!
Quique

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After perusing the many books of one of my coworkers, I think I have good reason to believe the following:
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http://www.oracle.com/technology/products/jdev/howtos/10g/dynamicjdbchowto.html
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Hello ,
I have a JTextfield in a swing app. that is supposed to hold date and saves its values to a database column of Date type .
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Im trying to get the the String in the TextField in order to use it in the setDate method of the Prepared Statement but there is something wrong with it :
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However, when I program in Java
i find that most of the time I am making my variables
global. (meaning public)Sounds like you are writing bad code. Public variables should be extrememly rare except static final 'constants'.
Is the fact that they are in a class supposed
to make up for that fact? Absolutely not.
With subclasses you can also
have 3rd parties working on your data. It seems a bit
suspicious to me, like the data should be maintained
more strictly, or is it my job to do that? Yes, it's your job.
I am just
curious, but it seems java promotes global variables,
which I find to be bad programming practice since
anything can operate on them. I appreciate any
input...Java does not promote public variables. You have to explicitly make them public.

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Compile questions about example " DrawTest.java"

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