Hi Lambok,
The reason is that you are initialising the string s4 in a try
block. You have declared s4 as a String earlier on, but you have not given
it a value. When you run the code in the try block the compiler (JVM) see
that there is a possibility that the line :
s4 = new String( charArray, 6, 4 );
failed, and so s4 may not have been given a value, i.e. it has not been
initialised.
Replace the line :
String s, s1, s2, s3, s4, s5, s6, s7, output;
with the lines :
String s, s1, s2, s3, s4, s5, s6, s7, output;
s4 = null;
and it will eliminate this error.
In fact, it is good coding practise to initialise all objects in a
Java program.
Regards,
Fintan
-----Original Message-----
From: Lambok Sianturi [mailto:[EMAIL PROTECTED]]
Sent: 24 January 2003 03:47
To: JDJList
Subject: [jdjlist] Re: jar updation prob.
Hi all...
I have piece of code like this..
char charArray[] = { 'b', 'i', 'r', 't', 'h', ' ', 'd', 'a','y'};
byte byteArray[] = { (byte) 'n', (byte) 'e', (byte) 'w',
(byte) ' ', (byte) 'y', (byte) 'e',
(byte) 'a', (byte) 'r' };
StringBuffer buffer;
String s, s1, s2, s3, s4, s5, s6, s7, output;
s = new String( "hello" );
buffer =
new StringBuffer( "Welcome to Java Programming" );
// use the String constructor
s1 = new String();
s2 = new String( s );
s3 = new String( charArray );
try {
s4 = new String( charArray, 6, 4 );
}
catch( StringIndexOutOfBoundsException ex ) {
System.out.println( "out of exception" );
}
s5 = new String( byteArray, 4, 4 );
s6 = new String( byteArray );
s7 = new String( buffer );
output = "s1 = " + s1 +
"\ns2 = " + s2 +
"\ns3 = " + s3 +
"\ns4 = " + s4 +
"\ns5 = " + s5 +
"\ns6 = " + s6 +
"\ns7 = " + s7;
When i try to compile this, an error "variable s4 might not have been
initialized" occurs.
Would someone like to explain me why?
Thankyou in advance.
::Lambok Sianturi::
PT. Multi Garmenjaya
Jl. Krawang No. 1
Bandung - Jawa Barat
Indonesia
Phone : 62 22 7272222
----- Original Message -----
From: "abhay" <[EMAIL PROTECTED]>
To: "JDJList" <[EMAIL PROTECTED]>
Sent: Wednesday, January 22, 2003 9:45 PM
Subject: [jdjlist] jar updation prob.
| Hi everybody,
|
| I'm using WSAD-5 for application developement. I dynamically create a
| jar file (say AAA.jar ) and
| want to update it frequently in our application. I also use this jar
| file in our classpath of application.
| This jar is supposed to contain all the property files needed for our
| application. Initially AAA.jar will
| contain some property files. As the transactions initiate, property
| files in this jar will be changed and
| updated.
|
| I create a jar file by using a ZipOutputStream, store it in my
| ../../temp folder by some xx.0456.tmp
| file name. Then I delete the existing jar file using file.delete() and
| then rename the temp file by invoking
| the file.renameTo() method. But i found that the file.delete() doesn't
| delete my original jar file (which is
| being used by our application).
|
| Even invoking the SecurityManager.checkDelete() method didnot throw any
| exception (as the
| docs say) . I think that since AAA.jar is being used by our application
| ... WSAD must have
| locked it. (Another reason for this conclsion is that i cannot modify
| any of our jars manually while the
| application is running under WSAD). But if this is true then
| SecurityManager should have thrown an
| exception ...surprisingly ..it didn't.
|
| I'm a little confused ...If i'm logically correct .. please suggest me a
| solution or a workaround.
| If i'm not then please tell me where am i wrong.
|
| Thanks in advance.
|
| regards
| abhay
|
|
|
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|
|
|
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