mike cool

thx stu derby

but what will you do if your database on a server and many users will access it ?

hi
i use derby with java but i have some Q:

1-how can i create new user in my database using sql query
2-what sql dialect derby uses, and where can i find some references (like ms sql book online)

thx

hi all
i have a problem understanding the logic of using java with database

i use derby as a database

let say i have a customer , product; order;and orderline table

using java code ,i will create a client and then i will insert this client into the table

but now this client waht permissions i will give hime to all tables?

1-client can update his profile but not the id
2-he can order product, update his order, remove his order if it's not confirmed

how can i do this?

note : this is not school assignment , and i don't want the code i just want you guys to explain me the logic (what will do what)
thx

hi
i created a method that will create a file in spacific path ..
no i close the app and reopen it , now i want check if the file exists or not , i know there is a method in File class exists()-boolean but this method will not allow me to choose the path ?? coz i think it will check in the project path not the path that i creat the file to ....??

hey
i have a non fixed size list of main catogeries and from each catogory i will have non fixed size list of items
what i need to use for this
LinkedList or ArrayList or Vactor , ..etc?
note this list will be wriiten to desk
thx

hey

double d1 = 5555.55;
double d2 = 1111.11;

if i subtract d2 from d1

double d3 = d1 - d2;

the result will be : Sub is: 4444.4400000000005 ;

how can i control the decimal amount for example i want have only 3
digits after the dot Sub is: 4444.440
but not using output format
i try bigDecimal , math class but i couldn't find the solution
any idea

forget
what this tearDown() method does?
and also setUp() ?

hi
i want to start using junit to test my methods or class
i download it and i add it to my eclipse project but i can't use it
i want to test this method
how can i do it
this method take array of element and round them to 2 elements
example
array is {5,6,7,8,9}
result will be
{5,7}
here is the method
public int [] roundNum(int [] arr){ int [] arr2 = new int [2]; int carry = 0; for (int i=arr.length-1; i>=0; i--) { arr[i]+=carry; if(arr[i]>=5){ if (i==1){break;} arr[i]=0; carry=1; } else carry=0; } arr2[0]=arr[0]; arr2[1]=arr[1]; return arr2; }
and here is what i try in jUnit
import junit.framework.TestCase; import myUtil.*; public class ControlNumbeTest extends TestCase { private int [] arr = {5,6,7,8,9}; ControlNumberLength cm; public ControlNumbeTest(String args){ super(args); } protected void setUp() throws Exception { super.setUp(); cm= new ControlNumberLength(); } protected void tearDown() throws Exception { super.tearDown(); } public void roundNum() { assertEquals("Test round number in array failed",6,cm.roundNum(arr)); } }
note :
as you see i change the method to return only one int coz i don't know how to test array
that is why i post the original method
thx

thanks that helps
i have other part that i can't solve
let say input will be 16485(short)
how can i converted to 3 decimal digits 0.170 ??

command line or swing or both

hi all
how can i force the user to enter limit input
the type is short
limit is 3 digit
so he can only enter 3 digit
thx in advance

hi all
can i compile my code in visual studio.net
i heard that i can use java code and other codes of onother language in one project is this true?
how?
thx

hi
can you tell me how printf works and its character ex (%s %d %..etc)
and where is it in the api
is there any url refer to this ?
thanks

Guys i did every thing i can do ,, i'm in close way i can't no more think ,,,,,
i wrote the documintation i did step by step but it always end in the same place
pls any tips

thanks Layne
i will try