Array length issues
Whatever i put in for h, tiles at i's length is always 1.
tiles' length is correct. Why?
whether that code is in an external .as file or not is
irrelevant. the problem is it's probably in a class file and
there's something (other than the code you showed) that's causing
the problem.
Similar Messages
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Why arrays length is defined to be a field not a method in Java?
Why arrays length is defined to be a field not a method in Java?
TRANSLATE result USING R.
This statement replaces all characters in field result according to the substitution rule stored in field string R . R contains pairs of letters, where the first letter of each pair is replaced by the second letter.
in your case TRANSLATE result USING '#'.
menas '#' and ' ' space are 2 pair of characters.. and # is replaced by ' ' (space).
for better understanding..
Example:
DATA: T(10) VALUE 'AbCdEfGhIj',
STRING LIKE T,
RULE(20) VALUE 'AxbXCydYEzfZ'.
STRING = T.
TRANSLATE STRING USING RULE.
WRITE / STRING.
Output:
xXyYzZGhIj
Hope this helps.. -
How to set array length correctly in this case
class RunJavaCode implements ActionListener{
public void actionPerformed(ActionEvent e){
try{
Process proc=Runtime.getRuntime().exec("java javaapp");
InputStream input=proc.getInputStream();
byte[] b=new byte[3000];
input.read(b);
String javaReport=new String(b);
input.close();
outputText.setText(javaReport);
}catch(IOException ioex){System.out.println("IOException is "+ioex);}
}how to set this array(byte[] b) length correctly? I mean this array length should not only save memory,but also enough to use('enough to use' mean that read outputed info from console to this byte array never overflow)Hi,
you cannot know in advance, how many bytes will be read. But the read-method returns the number of bytes actually read and this is important!
So at least you have to write: int r = input.read(b);
String javaReport=new String(b, 0, r); However, you still do not know, whether there is even more output available. You could however retrieve the data in a loop and append it e.g. to a StringBuffer, until EOF is encountered. -
Maximum array length in javacard
hi all
i have a java class with 20 member variables.
member variables are array of bytes. i doesn't allocate
memory for this variables in class constructor,
memory for this variables is dynamically allocated
in my javacard applet (*runtime*).
i defined an array of this class in my applet( in applet constructor):
myclassArray = new myclass[MAX]
for ( short i =0; i < MAX; i++ )
myclassArray[i] = new myclass();myclass.java:
class myclass {
byte[] membervariable1;
setVar1( byte[] input) {
membervariable1 = input;
}if MAX >= 100 , i can't load applet on the card.
(error :conditions of use not satisfied)
why this problem occurs? my card is 32k and i doesn't allocate memory for myclass member variables in applet constructor;
maybe an array of class in javacard has a maximum value in its length. am i right?
thanks,
siavashs.fallahdoost wrote:
hi all
i have a java class with 20 member variables.
member variables are array of bytes. i doesn't allocate
memory for this variables in class constructor,It doesn't look like it. If you look at the code snippet below, which is located in the constructor, you are allocating memory in the loop.
memory for this variables is dynamically allocated
in my javacard applet (*runtime*).Does not like it neither. If you look at your second code snippet, you're jusr re-referencing the pointer to another instance.
i defined an array of this class in my applet( in applet constructor):
myclassArray = new myclass[MAX]
for ( short i =0; i < MAX; i++ )
myclassArray[i] = new myclass();myclass.java:
class myclass {
byte[] membervariable1;
setVar1( byte[] input) {
membervariable1 = input;
}if MAX >= 100 , i can't load applet on the card.
(error :conditions of use not satisfied)Could be, since you're allocating memory in the constructor.
why this problem occurs? my card is 32k and i doesn't allocate memory for myclass member variables in applet constructor;
maybe an array of class in javacard has a maximum value in its length. am i right?The maximum array length is 32k. -
Problems with getting array length
I couldn't get array length in the java from the oracle.
Here is my source.
Can anybody answer me, I will really appriciate that.
Thanks.
public class Test_tb{
public static double Test (oracle.sql.ARRAY args){
double ret = 0;
try {
Double[] retArr = (Double[]) args.getArray();
return retArr.length;
} catch (Exception e){}
return ret;
}I've rewritten your code to include the display of any exception that might occur. Could you please run it and post any stack trace here? Thanks.
public class Test_tb{
public static double Test (oracle.sql.ARRAY args){
double ret = 0;
try {
Double[] retArr = (Double[]) args.getArray();
return retArr.length;
} catch (Exception e){}
e.printStackTrace();
return ret;
} -
Question on array.Length
I have an array[4]. Then the subscripts are number 0, 1, 2, 3. Does array.Length return 4 or 3. I am thinking 4 but I want to make sure.
java.secure(?).SecureRandom.java.security.SecureRandom
It's more straightforward and has better statistical properties.While I agree, with the straightforward,
but statistical I would of thought they'd
be even.It's better for several reasons:
1) nextInt is faster. It uses (on average) 1-1/3 calls to next(int), whereas nextDouble() (what Math.random() uses) always uses two. This also means nextInt will use up the generator's period more slowly.
2) It's statistically better. Although the odds of you noticing that some numbers are favored (slightly) over the "noise" of the prng's own bias are negligible.
3) It's nicer to use nextInt. It uses OO (instead of the relatively global function call to Math.random()), it doesn't compete with other parts of the Application for using up some of the prng's period, it allows the substitution of other (better or worse) algorithms with fewer changes, and it looks better.
~Cheers -
How to calc array length in Labwindows CVI ?
How to calc array length in Labwindows CVI ? In labwiew,I can find function to calc array length,but in CVI ,I can not ,...
Hello 让一切随风
char *name ;
int length = 0;
int i = 0;
name = malloc(256) ;
strcpy(name , "National Instruments");
while( name[i] ! = "\0")
length ++;
i++
free(name); -
I was just wondering if i have an array
double [][][] array = new double [1][2][3];array.length only gives 1, what function can i use to find the size of the other dimensions (2 and 3)? Thanks in advance for any help.I'll try and explain this a little better.
Say array[0].length is 2, then that means that there is only
array[0][0] and array[0][1].
If array[0][0] is 4, then that means that there is only
array[0][0][0], array[0][0][1], array[0][0][2], and array[0][0][3].
The reason i did array[0][0].length and not array[0][1].length
in my other post is because they would both return the same
thing because of the way you declared the array.
When you dodouble[][] array = new double[2][3];this is making it so that array[0].length is 3 and array[1].length is 3.
But if you do this (shown in the previous post)
double[][] aray = {
{ 2.4, 5.6, 6.4 },
{ 1.4 }
}then array[0].length is 3, but array[1].length is 1.
Hope this helps. -
This and super keywords, array.length attribute
'this' and 'super' keywords and array.length attribute are declared in which java class?
and also during running of a java program how they are initialized and how they work?'this' and 'super' keywords and array.length attribute are declared in which java class?They are not declared in any Java class, any more than the keywords 'class', 'interface', 'for', 'while', etc., are. They are defined in the grammar of the Java language, in the Java Language Specification.
and also during running of a java program how they are initialized and how they work?That's much too large a question for a forum. Try reading the Java Tutorial. -
Maximum possible ARRAY LENGTH ?!?!
Hello All
How can I know (before allocating memory) what is the maximum possible array length. Does it depend on the JVM version or OS or something else ???
Please help !Thanx All !!!
I've moved to more "memory saving" algorithm, so there is no problem now :-))
But another 2 questions has poped up: I'm using a Vector object in a pretty long loop (millions of iterations) and once in a while accumulating some data (Long and Double objects) by adding them to the Vector.
1. What can be the maximum possible vector length ?
2. What's faster: using a Vector object or using a regular "long or double" array that should be reallocated as:
double[] arr = new double[****];
for(long i=0; i<Long.MAX_VALUE; i++)
// add new elem
double[] tmp = new double[arr.length+1];
System.arraycopy(arr, 0, tmp, 0, arr.length);
tmp[tmp.length] = newElem;
arr = tmp;
} -
Quick array length question...
for this part of my code i'm trying to determine the components needed to find the average of my array. I can't seem to find a way to determine the length of my array (how many components it consists of). Every time I keep getting the dereferencing error....I know it's something simple but I just can't seem to get it right. Please help!
int total = 0, mean = 0, length = 0;
for(int j=0; j<i; j++)
total = total + array[j];
System.out.print(array[j]+" ");
System.out.print(total);Hi Cher,
This length attribute if any array object will give you the number of components I mean number of elements in that array.
array.length; rather than array.length();
This may be helpfull.
int total = 0, mean = 0, length = 0;
for(int j=0; j<array.length; j++)
total = total + array[j];
System.out.print(array[j]+" ");
System.out.print(total);>
Aski -
Get Type ArrayElement fails if array length is 0
All:
Get<Type>ArrayElement fails if the array length is 0 in 1.4. It seems to work fine in 1.5. I was "googling" and I found this link -- http://e-docs.bea.com/wljrockit/v315/relnotes/relnotes.htm. It mentions that this problem -- The JNI methods GetStringChars and Get<>ArrayElements threw OutOfMemoryError if called with a String or array of zero length -- was fixed in version 3.1.4. What is version 3.1.4 and how does this relate to JDK verions that I get out of java -version.
I will appreciate any pointers.
M.P. Ardhanareeswaran
Oracle USADrag and drop within a datagrid is rather an unusual thing to do.
I would suggest your problem lies in choosing to do something which will cause complications.
Hope that helps.
Recent Technet articles: Property List Editing;
Dynamic XAML -
Physical vs Logical length issues
I am importing a fixed field flat file, and the file has a line with a special character in it. The datastore column in question is set to have a physical and logical length of 40 but ODI is erroring out saying the actual value is 41 characters. If I increase the logical length to 41 characters, but leave physical alone, the interface successfully loads the file to my relational destination.
Have I introduced any potential issues down the line by having my logical length greater than my physical length?I think you changed the physical to 41 and leaving the logical to be 40.
I dont think you will cause any issues down the lane.
This concept is very valid in situations where you would have multi-byte characters which will physically take more bytes to load even though the logical length is less -
Table DD03L - Field Internal Length issue
Our Basis team performed a system refresh from our Production ECC 6 server to our Sandbox server.
Afterwards, we noticed an issue in table DD03L - this table holds the
table & field definitions for the data dictionary objects.
In DD03L, we found that the internal lengths (field INTLEN) of all of
our fields in table PA0001 had doubled from their original lengths. It
seems that this issue is affecting table PA00001 only - For example, Field ABKRS shows an INTLEN = 4 while in Production INTLEN = 2.
However, when we view PA0001 in SE11, all of the field attributes look
normal.
Anyone run into anything similar to this? This may be more of a Basis
question, though.
Thanks alot,
robert.i'm suspicious that it does have something to do with Unicode - but when we implemented last year, all of our boxes were converted to Unicode compliant.
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I've been trying to make a terminal like program, but I've had issues detecting the file size. When I use file.length(), I get wildly different answers than use of the "du" unix command. Is this a bug in java? Mac OS X? Just me being an idiot?
Thank you.They do different things for different purposes. du reports total disk usage, so it rounds up to the next block size. File.length() reports actual file size in bytes.
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