hi there i am trying to implement a simple chatserver and when searching for examples i saw a synchronized statement which uses a variable as a lock of the block.. the code is this;

private List myList = new ArrayList();
private Map();

public void put( String s, Bar b ) {
synchronized( myMap ) {
myMap.put( s,b );
// then some thing that may take a while like a database access or RPC or notifying listeners
}
}

public void hasKey( String s, ) {
synchronized( myMap ) {
myMap.hasKey( s );
}
}

public void add( Foo f ) {
synchronized( myList ) {
myList.add( f );
// then some thing that may take a while like a database access or RPC or notifying listeners
}
}

public Thing getMedianFoo() {
Foo med = null;
synchronized( myList ) {
Collections.sort(myList);
med = myList.get(myList.size()/2);
}
return med;
}

so i cant understand why and how can be a list be a lock. i always use "this" for accessing a synchronized statement. i appreciated if you can help me and thanks anyway : )

well i will have a search on these links. thanks mate : )

yess i mean this. well i am taking java courses and i want some java homework so he told me that i can work on this subject.: ) finally i created the code and it creates the files which must be compiled. so only the problem is how can i compile them : )

yess i mean this. well i am taking java courses and i want some java homework so he told me that i can work on this subject.: )

well ok you are right : ). i will delete the topic .

hey sorry for late answer : ). nope this is not a business requirement only a little work. so i mean you can not use "!+^%.." characters in name. for exmaple "Pe&%ter".

hi there i am working on a project that my goal is when i run my code it will create another file(classes) (exp: personalList.java) and user must associate with second file. for example; i have a file "PersonalDatabaseCreator.java" and this file creates "Person.java" (which is my object and includes properties getters setters etc.) and "PersonalList.java" which user will interact. (PersonalList.java ask the location of the text file which contains people to add into a LinkedList. Therefore, user will do add search remove etc. operations). but the problem it only works when i create classes in IDE myself and copying the code into them and run them. so i need a code which will do it itself!. you will say i am working on a silly project : D. but i wonder if is there any code samples like this_?. and i hope i explained my problem correctly. so thanks anyway : ).

thanks mate i will try it then : )

well yes i know this class but i guess there arent any specific functions which they check specific characters. as you see in the link http://cplusplus.com/reference/clibrary/cctype/ there are several functions. but in java i can't check a string contains only alphabetic characters_?

hi there i am trying write a function that checks if a string contains punctuation characters like %,&,!. because i dont want to user enter an invalid name last_name so i want check the string.

and also i guess this is for C#_?. :).

well mate i guess this is C++ or C#_? cause i can't understand the codes. i am working with C :). but thanks for your help

well finally i managed it :). thanks for your help mates :).

well i almost near the solution. i use atoi() (i can't use strtoi() cause i guess compiler or O/S doesn't compatible with this function). so this the example code

int main(void) {

char c\[11\] = "2000/10/15";

       printf("the number is %d", atoi(c));
return 0;

}

and the output is 2000. the problem is how can i take other numbers "10" and "15". i guess when i take this numbers i can able to solve the problem.

well i search all the fields of time.h in the link which you gave me but i can't find any solutions. i guess i will use difftime to compare two dates which are time_t variables. but the problem is i read the birthday string from the file and need to convert this string to time_h variable and then i can compare current time and her/his birthday. i will search another ways.

but if i give size of 20 to string "buff" how can i manage to make unused fields to 0. and i only read the strings with "YYYY-MM-DD" from a file not including minutes and second etc._?

well yes you are right :). on the other hand this is C++. i forgot to say that i am working with C.

hi friends i am trying to find the contacts who have a birthday in the next 7 days in my list. i managed get the current time as a string but i am stucked here. i know i must compare only number of the month and day. so use subtraction and if the result is <=7 i will show the contact. but i don't know how to do this. i appreciated if you can help me. and here is the my example code.

#include <stdio.h>
#include <time.h>
#include <string.h>

int main( )
{
char buff[11];
char birth[11]="2011-05-15";

int res;

time\_t now = time(NULL);
strftime(buff, 20, "%Y-%m-%d\\n", localtime(&now));

         
         res = difftime(mktime(birth), now);
	  
	  printf("%d", res);
	  
	 return 0;

}

i don't understand the operation you said "mark the item in the ordered list as dead - you can't delete it or you'll ruin the indices". how can i do this_?. i am using free(nameofptr) function to delete the node_?.

well mate i guess i will do with your suggested way. one ADD and Remove function. hope i can do it in time. and for your last suggestion it is perfect!! but i have corner cases. :)