Delimeter Between Strings

I am going to provide a long string as a parameter to a method. This long string consists of a number of Strings (the number is a variable) separated by delimeters; for example, "aa, bbbbb, ccc, ddddddd".
This method is supposed to return the length of the longest string in this comma separated list:
public int longestLength(String longString) { ... return longest; }
We can determine the length of a String using the length() method. And I am thinking to use the split() method and trim() method to get "aa", "bbbbb", "ccc", "ddddddd". In this case, the value 7 should be returned by the method.
However, I still need ideas about how to implement this method. Can anybody help? Thank you.

1) first try it yourself: you have nothing to lose by experimenting, and you truly should be able to get an answer on your own knowing what you know.
2) come back with code if this doesn't work.
The bottom line: you learn more if you do as much as possible on your own.

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What is the difference between string != null and null !=string ?

Hi,
what is the difference between string != null and null != string ?
which is the best option ?
Thanks
user8729783

Like you've presented it, nothing. There is no difference and neither is the "better option".

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While testing a VI which contain a normal string constant in VI analyzer, it gives error to change string constant with the empty string constant?
Please Reply
prabhakant
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Prabhakant Patil

Readability.
Functionally, they are the same. From a coding standpoint, the Empty String Constant is unambiguous.
It is empty and will always be; good for initialization. Also, because you can not type a value into and Empty String Constant, someone would need to conciously replace it to set a 'default' value that is something other than NULL.
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Hi friends,
This is Ramana. Can u suggest me in this Question
What is the difference between String and final String? Means
String str="hai";
final String str="hai";
Regards,
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*******REPEAT POST***********
We already answered your question why post in a different section?
http://forum.java.sun.com/thread.jspa?threadID=5201549

Adding white spaces between strings during concatenation in JSTL

Please provide a way to add white space between strings during concatenation in JSTL.
I tried the following.
eg:
<c:set var="even_odd" value="odd">
<c:out value="first ${even_odd}"/>
I want the output string as "first odd ".
Moreover i am using the above value for generating the class attribute of a row of a table like
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<tr class=<c:out value="first ${even_odd}"/>><tr class="first ${even_odd}">

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Both String and StringBuffer are final classes. StringBuffer grows in size dynamically. Could people help to detail other differences between String and StringBuffer?

String is immutable. In other words, once it is made, the contents of that instance of String cannot be changed (easily). The size and characters cannot be changed, and code can take advantage of this fact to optimize space. Also, once you have a reference to a string, you do not need to worry about it changing at all, so you can eliminate constant tests to verify things such as size in another class that may want to hold onto the string.
StringBuffer, as you noticed, can change dynamically. While this provides flexibility, it cannot be optimized and assumptions cannot be made as with strings. If a class holds a reference to a StringBuffer that it does not own, there is a possibility that it may change things such as size when the class tries to use it later. StringBuffer is also less efficient in handling space then an equivalent String. The character array to hold a String is exactly the length to hold all the characters. StringBuffer, on the other hand, adds a 16 character buffer of array space for possible expansions. Also, the size of the internal array doubles when its internal capacity is exceeded. So, unless you explicitly maintain the size, a StringBuffer will take up more memory then an equivalent String, and if your program needs thousands of instances of Strings (which is not uncommon), that space can add up.
I hope this helps clarify some things for you.
-JBoeing

What's the difference between String() - as String - toString();

Hello,
I'm wondering what's the difference between this 3 ways of getting around.

There is a great difference between String(), as String and toString() methods.
String(param) -- the more general and safe method.
Returns "null" (string!) if param is null;
Returns result of param.toString() method if it is defined in class;
Returns string representation of the param (returns "[object Object]" if param is Object);
param asString --
Returns string if param is a type of String;
Returns null otherway (if param is custom class, int or other type);
param.toString() -- call of toString() member function
throws an exception if param is null;
compile-time error if toString() method is not defined in param (if your custom class do not have or inherits this function);
returns result of toString() function
Exists also ""+param and param+"" ways. They are similar to ""+String(param) and String(param)+""
Pay attention:
var ss:String = null;
trace(String(ss)==(ss as String)); // Returns false as "null" not equal to null

Difference between String=""; and String =null

I want to know the difference especially the ADVANTAGE between the following-
1. String s="";
String s="ABC"
and
String s;
String s="ABC";
or String s=null;
String s="ABC";
2. Object anyObject;
anyObject-new Object();
and
Object anyObject=null;
anyObject=new Object();

Tanvir007 wrote:
I want to know the difference especially the ADVANTAGE between the following-
1. String s="";s points to the empty string--the String object containing no characters.
String s="ABC"s points to the String object containing the characters "ABC"
String s; Declares String reference varialbe s. Doesn't not assign it any value. If it's a local variable, it won't have a value until you explicitly assign it. If it's a member variable, it will be given the value null when the enclosing object is created.
String s="ABC";Already covered above.
or String s=null;s does not point to any object.
String s="ABC";???
You've already asked this twice.
Are you talking about doing
String s = null;
String s = "ABC";right after each other?
You can't do that. You can only declare a variable once.
If you mean
String s = null;
s = "ABC";It just does what I described above, one after the other.
2. Object anyObject;
anyObject-new Object();
and
Object anyObject=null;
anyObject=new Object();As above: In the first case, its value is undefined until the new Object line if it's a local, or it's null if it's a member.
As for which is better, it depends what you're doing.

Query on conversion between String to Enum type

Hi All,
I would like to get advice on how to convert between char and Enum type. Below is an example of generating unique random alphabet letters before converting them back to their corresponding letters that belonged to enum type called definition.Alphabet, which is part of a global project used by other applications:
package definition;
public enum Alphabet
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S,
T, U, V, W, X, Y, Z
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String currentAlphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
StringBuffer randomAlphabetSB = new StringBuffer();
for (int numberOfAlphabet=26; numberOfAlphabet>0; numberOfAlphabet--)
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remainingAlphabet.setLength( currentAlphabet.length() );
int current = 0;
for (int currentAlphabetIndex = 0; currentAlphabetIndex < currentAlphabet.length(); currentAlphabetIndex++)
char cur = currentAlphabet.charAt(currentAlphabetIndex);
if (cur != characterPicked.charAt(0))
remainingAlphabet.setCharAt( current++, cur );
currentAlphabet = remainingAlphabet.toString();
return randomAlphabetSB;
// System.out.println(randomAlphabetSB);
I got the following compilation error when trying to pass (Alphabet) StringBuffer[0] to a method that expects Alphabet.A type:
inconvertible types
required: definition.Alphabet
found: char
Any ideas on how to get around this. An alternative solution is to have a huge switch statement to assemble Alphabet type into an ArrayList<Alphabet>() but wondering whether there is a more shorter direct conversion path.
I am using JDK1.6.0_17, Netbeans 6.7 on Windows XP.
Thanks a lot,
Jack

I would like to get advice on how to convert between char and Enum type. Below is an example of generating unique random alphabet lettersIf I understand well, you may be interested in method shuffle(...) in class java.util.Collections, which randomly reorders a list.
before converting them back to their corresponding letters that belonged to enum type called definition.AlphabetIf I understand well, you may be interested in the built-in method Alphabet.valueOf(...) which will return the appropriate instance by name (you'll probably have no problem to build a valid String name from a lowercase char).

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Hi Syanitaa,
You actually only need to post the question once.
Multiple duplication. Please refer to this thread.

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First, I create the Image when needed, to start the background loading. Or maybe the loading is very long and you prefer to start earlier, so your version is fine in this case.
Second, I do what I described, binding to the progress variable of selectedImage, and watching the updates. And when we reach the wanted value, we start the second animation.

Line gap between string

Hi,
I want to concatenate two strings in a single one, and there shoule be gap of two lines between those two strings.
example I want to concatenate string1 and string2 in string3, then after concatenate the string3 should have value as shown below:
string1
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I have tried all the attributes of class CL_ABAP_CHAR_UTILITIES but it doesnt helped.
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Regards,
Neerup

Look at the code:
DATA: lv_string1 TYPE string VALUE 'string1',
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      lv_string3 TYPE string.
CONCATENATE lv_string1
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            cl_abap_char_utilities=>cr_lf cl_abap_char_utilities=>cr_lf
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INTO lv_string3.
WRITE lv_string3.
When you now download this list (save to local file) and open it in notepad, you will notice that it has three empty lines between the first and the second string.
The code is ok, however, you're requirement might not be clear to me.

Fastest way to access data between String and char[]

Hi all,
I've been programming a small String generator and was curious about the best and fastest way to do so.
I've done it in two ways and now hope you can tell me if there is a "more java version" or fastest way between those two or if I'm totally wrong as some classe in the API already does that.
Here are the codes:
version 1:
        //describe the alphabet
     String alphabet = "abcdefghijklmnopqrstuvwxyz";
     //The "modifiable String"
     StringBuffer stringBuffer = new StringBuffer();
     //Just put the temporary int declaration outside the loop for performance reasons
     int generatedNumber;
     //Just do a "for" loop to get one letter and add it the String
     //Let's say we need a 8 letters word to be generated
     for (int i=0; i < 8; i++)
         generatedNumber = (int)(Math.random() * 26);
         stringBuffer.append(alphabet.charAt(generatedNumber));
     System.out.println(stringBuffer.toString());
     stringBuffer =null;version 2:
        //describe the alphabet
     char[] alphabetArray = {'a', 'b', 'c', 'd', 'e', 'f',
                    'g', 'h', 'i', 'j', 'k', 'l',
                    'm', 'n', 'o', 'p', 'q', 'r',
                    's', 't', 'u', 'v', 'w', 'x',
                    'y', 'z'}
     //The "modifiable String"
     StringBuffer stringBuffer = new StringBuffer();
     //Just put the temporary int declaration outside the loop for performance reasons
     int generatedNumber;
     //Just do a "for" loop to get one letter and add it the String
     //Let's say we need a 8 letters word to be generated
     for (int i=0; i < 8; i++)
         generatedNumber = (int)(Math.random() * 26);
         stringBuffer.append(alphabetArray[generatedNumber]);
     System.out.println(stringBuffer.toString());
     stringBuffer =null;Basically, the question is, what is the safest, fastest and more "to the rules" way to access a char in a sequence?
Thanks in advance.
Edited by: airchtit on Jan 22, 2008 6:02 AM

paul.miner wrote:
Better, use a char[] instead of a StringBuffer/StringBuilder, since you seem to know the size of the array in advance.
Although I imagine making "alphabet" a char[] has slightly less overhead than making it a String
1. It's a lot clearer to write it as a String.
2. You can just call toCharArray() on the String to get a char[], instead of writing out each char individually.
3. Or if you're going to be using a plain alphabet, just use (randomNumber + 'a')
And use Random.nextInt()Hello and thx for the answers,
I know I shouldn't put constants in my code, it was just a piece of code done in 1 minute to help a colleague.
Even if it was just a one minute piece of code, I was wondering about the performance problem on large scale calculating, I mean something like a 25 characters word for billions of customers but anyway, once again, the impact should be minimal.
By the way, I didn't know the Random Class (shame on me, I still don't know the whole API) and, I don't understand why I should be using this one more than the Random.Math which is static and thus take a few less memory and is easier to call.
Is it because of the repartition factor?
According to the API, the Random.Math gives (almost) a uniform distribution whether the Random.nextInt() gives a "more random" int.
I

Preserve spaces between strings...

Hi everyone,
I an trying to extract some data to a flat file in a format that each column has start and end positions.
I am trying to pad some "spaces" after each column to get my requirement.My code is not preserving the
spaces between each string.
This is what i have..
But the strange thing i found is..i ran the following code
declare
final_str varchar2(100);
begin
final_str := rpad('12',4)||rpad('12',4);
insert into test(col1) values (final_str);
end;and it is preserving the spaces .
Is there anything wrong with my code.I need to preserve the spaces after each string.
Please help me to solve this issue..
Thanks

Hi Phani,
If you use chars instead of varchar2's you keep fixed lengths.
F.i.:
SQL> declare
2    a varchar2(50);
3    b char(50);
4 begin
5
6    for rec in ( select level*100 l from dual connect by level <= 5)
7    loop
8      a:=rec.l;
9      b:=rec.l;
10      dbms_output.put_line('>'||a ||'< (lenghth a = '||length(a)||')');
11      dbms_output.put_line('>'||b ||'< (lenghth b = '||length(b)||')');
12    end loop;
13 end;
14 /
100< (lenghth a = 3)
100 < (lenghth b = 50)
200< (lenghth a = 3)
200 < (lenghth b = 50)
300< (lenghth a = 3)
300 < (lenghth b = 50)
400< (lenghth a = 3)
400 < (lenghth b = 50)
500< (lenghth a = 3)
500 < (lenghth b = 50)
PL/SQL procedure successfully completed.

Javascript + space between string

HI,
I have a drop box on my jsp page, I am selecting multiple values and passing them to serlvet.Onclcick event of my button I am callin JS function, and I am seperating selected values by comma in a string.
But if string contains space inbetween it takes only first half of (string before space)
For example, if selected names are 'AAA BBB', 'ABC', 'CCC'
It takes: AAA,ABC,CCC
it doesn't take anything after space.
Could anyone please help with sample code, I will really appreciate it?
Thanks

Like I mentioned in the other topic, it's probably because your value isn't between double quotes.
In the code I've given below, you'll get alerts saying 'First Value', 'Second' and 'Third Value'. For the second one, the 'Value' word is missing since it isn't enclosed in double quotes.
<html>
<script>
function getDropDownValues( )
     dropDownBox = document.getElementById('dropdownexample');
     for ( i = 0; i < dropDownBox.options.length; i++ )
          alert(dropDownBox.options.value);
</script>
<body>
<select id="dropdownexample">
<option value="First Value">1</option>
<option value=Second Value>2</option>
<option value="Third Value">3</option>
</select>
<input type="button" value="Show Me The Values" onclick="getDropDownValues();" />
</body>
</html>
Oh, and JavaScript doesn't have anything to do with Java. And these are Java forums :)

Delimeter Between Strings

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