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..

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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,
siavash

s.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.

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.

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.

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);

Why Array.as class is made dynamic?

Why Array.as class is made dynamic?
public dynamic class Array

For one thing, array "elements" are merely dynamic properties. For example, when you access a[0] you are really accessing a["0"], i.e., a dynamic property named "0".
For another thing, Ecmascript requires Array to allow accessing any property, such as a["foo"].
Gordon Smith, Adobe

Finding Array Length

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.

Why array index starts from 0(zero)?

Hi,
I want to know, why array index starts from 0?

There is also another historical reason for this which often gets overlooked.
In machine language some instruction sets have a branch-on-zero instruction which would always come in very handy for saving CPU time in most kinds of loop.
These days you're used to forming your loops just as you like, which you could then, but a construct like
public class arraycopy {
     public static void main(String[] args)
          final int arraysize = 10;
          int[] i = new int[arraysize];
          int x;
          for (x = 0; x < arraysize; x++)
               i[x] = 25;
}effectively, each time the loop check is done, it compares i with arraysize and breaks if the condition fails. This program translates to...
LDA #$25
LDX #$00
LOOP STA $0200,X // <---- Note $0200 = arbitrary array location + X.
INX
CPX #$0A
BNE LOOP
In machine language (OOPS programmers will notice that the machine-language program is shorter, 12 bytes long in fact and it also executes much much faster).
Basically, the problem is, that CPX, the compare, takes time, almost 1/5 of the total execuation time, and in a small loop for a long array it eats clock cycles... and a couple of bytes (Tchoh!).
So, you can save time by re-writing the same loop thus...
LDA #$25
LDX #$0A
LOOP STA $01FF,X
DEX
BNE LOOP
By writing the loop backwards and taking advantage of the machine language underneath (i.e. the Real executable part of the program), you write a program that does exactly the same thing as the first example and is smaller and faster and easier to read. In fact the program takes 10bytes of memory. In machine-code you can place a complete working program in the amount of memory space it now takes you to store two double floats... now that's progress for you! : )
Python does it, C does it and I have been bemoaning the fact that Java doesn't ever since I began using it. I want to be able to start a loop:
while (x--)
For those who know the rule that all non-zero numbers are true, there is a multitide of new choices!
Join the revolution at
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6350717
: )

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 USA

Drag 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

Why String class is defined as immutable?

Why String class is defined as immutable? what can be the reason behind it?

Do try this at home. :)
public class Main {
    public static void main(String... args) {
        System.out.println("Greetings.");
        System.out.println("Goodbye.");
    static {
        // translates into Japanese. NOT a good idea!
        try {
            final Field field = String.class.getDeclaredField("value");
            field.setAccessible(true);
            char[] chars = new char[8];
            "Sayonara".getChars(0,8,chars,0);
            field.set("Goodbye.", chars);
            chars = new char[10];
            "Konichi-wa".getChars(0,10,chars,0);
            field.set("Greetings.", chars);
        } catch (Exception e) {
            throw new AssertionError(e);
}

My app went from working fine to: Id field not defined for cfc Path.to.my.ORMCfCPag when I restarted

Hi everyone,
I have a CF9 ORM problem that I haven't been able to figure out and thought I'd see if you had any idea. I have seen a few postings talking about a "similar" problem but none of them correctly resolved this particular issue. I appreciate any help you can offer.
I recently created a CF9 app where I generated scripted ORM CFCs for my app using ColdFusion Builder. It worked great and my app was completely working. However, when I was adding some enhancements, I ran into an error when I restarted the CF app server. Here's the message I keep getting:
"Id field not defined for cfc Path.to.my.ORMCfCPage. Either the table should have a PK column mapped to a cfc field OR at least one field should be specified as id."
My App.cfc file only had orm enabled (no other mappings) when it was working. I've since tried specifying things like the cfc location etc. and it still hasn't helped.
// MORE DETAILS:
- When my app was working, I had moved it to 2 other servers. I had this error on both of those but not on my local copy. They all use the exact same database.
- The last change I made before the error was adding a generator="identity" field to my generated ORM beans. Once I got the message, I tried changing it back and restarting again but still got the error.
- I've also made sure all of the Adobe tags are in my web root (as suggested in a prior posting about this problem). I've search all over for a solution and nobody has a solution posted online that works so far.
Do you have any idea why this is happening?
Thanks!
Jeff

Quick thought and probably not relevant, but do you have this.ormsettings.savemapping set to true in your Application.cfc? I've fallen foul of this before - once CF has generated the hbmxml files and saved them to disk you can make all kinds of changes to your code which won't make a difference as it'll continue to read from the file versions, but only for certain properties and methods at times it seems.
Long shot I know, but I found CF ORM to be a nightmare for seemingly random caching.

Why arrays length is defined to be a field not a method in Java?

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