I need help understanding where to start with the following study question. If you could give me some tips b/c the book is very vague and I am lost..
Thanks
Design a Java interface called Lockable that includes the following methods: setKey, lock, unlock, and locked. the setKey, lock, and unlock methods take an integer parameter that represents the key. The setKey method establishes the key. The lock and unlock methods lock and unlock the object but only if the key passed in is correct. The locked method returns a boolean that indicates whether or not the object is locked. A Lockable object represents an object whose regular methods are protected: if the object is locked, the methods cannot be invoked; if it is unlocked they can be invoked. Redesign and implement a version of the Coin class so that it is Lockable. Submit hard copy of a Rational Rose UML class diagram, the redesigned Coin class and test driver class.

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• Best Usb Devices

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Heres the interface:public interface Lockable{
public void setKey(int key);
public void lock(int key);
public void unlock(int key);
public boolean locked();
}Sample Class:public class Coin implements Lockable{
private boolean locked;
private int key ;
public Coin(){
locked = false ;
key = 0 ;
public boolean locked(){
return locked ;
public void setKey(int key){
this.key = key ;
public void unlock(int key){
if(this.key key){
locked = false ;
public void lock(int key){
if(this.key key){
locked = true ;
public void sayHello(){
if(!locked) System.out.println('HelloWorld') ;
}

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• Forgive me for my 'ignorance' on recording but I thought I could get some decent advice in here..
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• Hello every one,
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  Ihave also attached the schematic.
  Tahnx in advance
  Attachments:
  schem.JPG ‏37 KB

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• Hi all
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• Hello, please help, my interface is connected to the microphone and when i open Logic 9 it does´t work. But I opened garageband to check and it works fine. I can record voice with any effect.. With Logic i see the sound passes in the interface but does not arrive in Logic. The Loops works fine and i can hear. Is just the sound to record the voice it does not work. What can i do ??? I used Logic before in the same computer and it worked fine. Thank you so much, I´m a begginer recording myself.

  Make sure you go into preferences in Logic and set the audio input to be your interface and the audio output to be either built in output or the interface, if that is hooked up to something else. It sounds like Garageband has the audio interface set as the input but not Logic.
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• I was posting in a thread on support for logic which appears to have been deleted. anyway, what I was going to say I think is useful info for people, so I'm going to post it anyway. to the mods - it doesn't contain any speculation about policies or anything like that. just an explanation of my views on the best way to deal with issues people have with logic, which I think is a valuable contribution to this forum.
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  In all honesty this is currently the 3rd 'logicboard' (motherboard)
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  But it still 'just works'. Apart from the battery power obviously. And the ram slot. And the ram. And the screen. And the hard drive. And the firewire ports. And the feet.
  But everything apart from the main board, the screen, the case, the hard drive and the power supply works fine. So thats.. er.
  Hmm.

• Hello.
  I've come across a situation that is somewhat beyond my knowledge base. I could use a little help with figuring this out.
  My situation:
  I am attempting to do some reporting from a JIRA database. What I am doing is getting the dates and times for specific step points of a ticket. This is resulting in many rows per ticket. What I need to do is return one row per ticket with a calculation of time between each step. But one issue is that if a ticket is re-opened, I want to ignore all data beyond the first close date. Also, not all tickets are in a closed state. I am attaching code and a sample list of the results. If I am not quite clear, please ask for information and I will attempt to provide more. The database is 10.2.0.4
  select jiraissue.id, pkey, reporter, summary
  ,changegroup.created change_dt
  ,dbms_lob.substr(changeitem.newstring,15,1) change_type
  ,row_number() OVER ( PARTITION BY jiraissue.id ORDER BY changegroup.created ASC ) AS order_row
  from jiraissue
  ,changeitem, changegroup
  ,(select * from customfieldvalue where customfield = 10591 and stringvalue = 'Support') phaseinfo
  where jiraissue.project = 10110
  and jiraissue.issuetype = 51
  and dbms_lob.substr(changeitem.newstring,15,1) in ('Blocked','Closed','Testing','Open')
  and phaseinfo.issue = jiraissue.id
  and changeitem.groupid = changegroup.id
  and changegroup.issueid = jiraissue.id
  order by jiraissue.id,change_dt
  Results:
  1 21191 QCS-91 Error running the Earliest-deadlines flight interface request/response message 2008-07-16 9:30:38 AM Open 1
  2 21191 QCS-91 Error running the Earliest-deadlines flight interface request/response message 2008-07-16 11:37:02 AM Testing 2
  3 21191 QCS-91 Error running the Earliest-deadlines flight interface request/response message 2010-06-08 9:14:52 AM Closed 3
  4 21191 QCS-91 Error running the Earliest-deadlines flight interface request/response message 2010-09-02 11:29:37 AM Open 4
  5 21191 QCS-91 Error running the Earliest-deadlines flight interface request/response message 2010-09-02 11:29:42 AM Open 5
  6 21191 QCS-91 Error running the Earliest-deadlines flight interface request/response message 2010-09-02 11:29:50 AM Testing 6
  7 21191 QCS-91 Error running the Earliest-deadlines flight interface request/response message 2010-09-02 11:29:53 AM Closed 7
  8 23234 QCS-208 System Baseline - OK button does not show up in the Defer Faults page for the System Engineer role 2008-10-03 10:26:21 AM Open 1
  9 23234 QCS-208 System Baseline - OK button does not show up in the Defer Faults page for the System Engineer role 2008-11-17 9:39:39 AM Testing 2
  10 23234 QCS-208 System Baseline - OK button does not show up in the Defer Faults page for the System Engineer role 2011-02-02 6:18:02 AM Closed 3
  11 23977 QCS-311 Tally Sheet - Reason Not Done fails to provide reason for unassigned tasks 2008-09-29 2:44:54 PM Open 1
  12 23977 QCS-311 Tally Sheet - Reason Not Done fails to provide reason for unassigned tasks 2010-05-29 4:47:37 PM Blocked 2
  13 23977 QCS-311 Tally Sheet - Reason Not Done fails to provide reason for unassigned tasks 2011-02-02 6:14:57 AM Open 3
  14 23977 QCS-311 Tally Sheet - Reason Not Done fails to provide reason for unassigned tasks 2011-02-02 6:15:32 AM Testing 4
  15 23977 QCS-311 Tally Sheet - Reason Not Done fails to provide reason for unassigned tasks 2011-02-02 6:15:47 AM Closed 5

  Hi,
  Welcome to the forum!
  StblJmpr wrote:
  .. I am attempting to do some reporting from a JIRA database. What is a JIRA database?
  I am attaching code and a sample list of the results. If I am not quite clear, please ask for information and I will attempt to provide more. Whenever you have a question, please post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and the results you want from that data.
  Simplify the problem as much as possible. For example, if the part you don't know how to do only involves 2 tables, then jsut post a question involving those 2 tables. So you might just post this much data:
  CREATE TABLE changegroup
  ( issueid NUMBER
  , created DATE
  , id NUMBER
  INSERT INTO changegroup (issueid, created, id) VALUES (21191, TO_DATE ('2008-07-16 09:30:38 AM', 'YYYY-MM-DD HH:MI:SS AM'), 10);
  INSERT INTO changegroup (issueid, created, id) VALUES (21191, TO_DATE ('2008-07-16 11:37:02 AM', 'YYYY-MM-DD HH:MI:SS AM'), 20);
  INSERT INTO changegroup (issueid, created, id) VALUES (21191, TO_DATE ('2010-06-08 09:14:52 AM', 'YYYY-MM-DD HH:MI:SS AM'), 90);
  INSERT INTO changegroup (issueid, created, id) VALUES (21191, TO_DATE ('2010-09-02 11:29:37 AM', 'YYYY-MM-DD HH:MI:SS AM'), 10);
  INSERT INTO changegroup (issueid, created, id) VALUES (21191, TO_DATE ('2010-09-02 11:29:42 AM', 'YYYY-MM-DD HH:MI:SS AM'), 10);
  INSERT INTO changegroup (issueid, created, id) VALUES (21191, TO_DATE ('2010-09-02 11:29:50 AM', 'YYYY-MM-DD HH:MI:SS AM'), 20);
  INSERT INTO changegroup (issueid, created, id) VALUES (21191, TO_DATE ('2010-09-02 11:29:53 AM', 'YYYY-MM-DD HH:MI:SS AM'), 90);
  INSERT INTO changegroup (issueid, created, id) VALUES (23234, TO_DATE ('2008-10-03 10:26:21 AM', 'YYYY-MM-DD HH:MI:SS AM'), 10);
  INSERT INTO changegroup (issueid, created, id) VALUES (23234, TO_DATE ('2008-11-17 09:39:39 AM', 'YYYY-MM-DD HH:MI:SS AM'), 20);
  INSERT INTO changegroup (issueid, created, id) VALUES (23234, TO_DATE ('2011-02-02 06:18:02 AM', 'YYYY-MM-DD HH:MI:SS AM'), 90);
  INSERT INTO changegroup (issueid, created, id) VALUES (23977, TO_DATE ('2008-09-29 02:44:54 PM', 'YYYY-MM-DD HH:MI:SS AM'), 10);
  INSERT INTO changegroup (issueid, created, id) VALUES (23977, TO_DATE ('2010-05-29 04:47:37 PM', 'YYYY-MM-DD HH:MI:SS AM'), 30);
  INSERT INTO changegroup (issueid, created, id) VALUES (23977, TO_DATE ('2011-02-02 06:14:57 AM', 'YYYY-MM-DD HH:MI:SS AM'), 10);
  INSERT INTO changegroup (issueid, created, id) VALUES (23977, TO_DATE ('2011-02-02 06:15:32 AM', 'YYYY-MM-DD HH:MI:SS AM'), 20);
  INSERT INTO changegroup (issueid, created, id) VALUES (23977, TO_DATE ('2011-02-02 06:15:47 AM', 'YYYY-MM-DD HH:MI:SS AM'), 90);
  CREATE TABLE changeitem
  ( groupid NUMBER
  , newstring VARCHAR2 (10)
  INSERT INTO changeitem (groupid, newstring) VALUES (10, 'Open');
  INSERT INTO changeitem (groupid, newstring) VALUES (20, 'Testing');
  INSERT INTO changeitem (groupid, newstring) VALUES (30, 'Blocked');
  INSERT INTO changeitem (groupid, newstring) VALUES (90, 'Closed');Then post the results you want to get from that data, like this:
  ISSUEID HISTORY
  21191 Open (0) >> Testing (692) >> Closed
  23234 Open (45) >> Testing (807) >> Closed
  23977 Open (607) >> Blocked (249) >> Open (0) >> Testing (0) >> ClosedExplain how you get those results from that data. For example:
  'The output contains one row per issueid. The HISTORY coloumn shows the different states that the issue went through, in order by created, starting with the earliest one and continuing up until the first 'Closed' state, if there is one. Take the first row, issueid=21191, for example. It started as 'Open' on July 16, 2008, then, on the same day (that is, 0 days later) changed to 'Testing', and then, on June 8, 2010, (692 days later), it became 'Closed'. That same issue opened again later, on September 2, 2010, but I don't want to see any activity after the first 'Closed'.'
  The database is 10.2.0.4That's very important. Always post your version, like you did.
  Here's one way to get those results from that data:
  WITH got_order_row AS
  SELECT cg.issueid
  , LEAD (cg.created) OVER ( PARTITION BY cg.issueid
  ORDER BY cg.created
  - cg.created AS days_in_stage
  , ROW_NUMBER () OVER ( PARTITION BY cg.issueid
  ORDER BY cg.created
  ) AS order_row
  , ci.newstring AS change_type
  FROM changegroup cg
  JOIN changeitem ci ON cg.id = ci.groupid
  WHERE ci.newstring IN ( 'Blocked'
  , 'Closed'
  , 'Testing'
  , 'Open'
  -- AND .. -- any other filtering goes here
  SELECT issueid
  , SUBSTR ( SYS_CONNECT_BY_PATH ( change_type || CASE
  WHEN CONNECT_BY_ISLEAF = 0
  THEN ' ('
  || ROUND (days_in_stage)
  || ')'
  END
  , ' >> '
  , 5
  ) AS history
  FROM got_order_row
  WHERE CONNECT_BY_ISLEAF = 1
  START WITH order_row = 1
  CONNECT BY order_row = PRIOR order_row + 1
  AND issueid = PRIOR issueid
  AND PRIOR change_type != 'Closed'
  ORDER BY issueid
  ;Combining data from several rows into one big delimited VARCHAR2 column on one row is call String Aggregation .
  I hope this answers your question, but I guessed at so many things, I won't be surprised if it doesn't. If that's the case, point out where this is wrong, post what the results should be in those places, and explain how you get those results. Post new data, if necessary.

• Hello,
  I need help with Creating Key Pairs, I generate key pais with aba provider, but the keys generated are not base 64.
  the class is :
  import java.io.*;
  import java.math.BigInteger;
  import java.security.*;
  import java.security.spec.*;
  import java.security.interfaces.*;
  import javax.crypto.*;
  import javax.crypto.spec.*;
  import au.net.aba.crypto.provider.ABAProvider;
  class CreateKeyPairs {
  private static KeyPair keyPair;
  private static KeyPairGenerator pairGenerator;
  private static PrivateKey privateKey;
  private static PublicKey publicKey;
  public static void main(String[] args) throws Exception {
  if (args.length != 2) {
  System.out.println('Usage: java CreateKeyParis public_key_file_name privete_key_file_name');
  return;
  createKeys();
  saveKey(args[0],publicKey);
  saveKey(args[1],privateKey);
  private static void createKeys() throws Exception {
  Security.addProvider(new ABAProvider());
  pairGenerator = KeyPairGenerator.getInstance('RSA','ABA');
  pairGenerator.initialize(1024, new SecureRandom());
  keyPair = pairGenerator.generateKeyPair();
  privateKey = keyPair.getPrivate();
  publicKey = keyPair.getPublic();
  private synchronized static void saveKey(String filename,PrivateKey key) throws Exception {
  ObjectOutputStream out= new ObjectOutputStream(new FileOutputStream(filename));
  out.writeObject(key);
  out.close();
  private synchronized static void saveKey(String filename,PublicKey key) throws Exception {
  ObjectOutputStream out= new ObjectOutputStream( new FileOutputStream(filename));
  out.writeObject(key);
  out.close();
  the public key is:
  �� sr com.sun.rsajca.JSA_RSAPublicKeyrC��� xr com.sun.rsajca.JS_PublicKey~5< ~��% L thePublicKeyt Lcom/sun/rsasign/p;xpsr com.sun.rsasign.anm����9�[ [ at [B[ bq ~ xr com.sun.rsasign.p��(!g�� L at Ljava/lang/String;[ bt [Ljava/lang/String;xr com.sun.rsasign.c�'dyU�| xpt Javaur [Ljava.lang.String;��V��{G xp q ~ ur [B���T� xp ��ccR}o���[!#I����lo������
  ����^'`8�|���Z>������&
  d ����'B��
  ^5���a����jw9�����D���D�)�*3/h��7�|��I�d�$�4f�8_�|���yuq ~
  How i can generated the key pairs in base 64 or binary????
  Thanxs for help me
  Luis Navarro Nu�ez
  Santiago.
  Chile.
  South America.

  I don't use ABA but BouncyCastle
  this could help you :
  try
  java.security.Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
  java.security.KeyPairGenerator kg = java.security.KeyPairGenerator.getInstance('RSA','BC');
  java.security.KeyPair kp = kg.generateKeyPair();
  java.security.Key pub = kp.getPublic();
  java.security.Key pri = kp.getPrivate();
  System.out.println('pub: ' + pub);
  System.out.println('pri: ' + pri);
  byte[] pub_e = pub.getEncoded();
  byte[] pri_e = pri.getEncoded();
  java.io.PrintWriter o;
  java.io.DataInputStream i;
  java.io.File f;
  o = new java.io.PrintWriter(new java.io.FileOutputStream('d:/pub64'));
  o.println(new sun.misc.BASE64Encoder().encode(pub_e));
  o.close();
  o = new java.io.PrintWriter(new java.io.FileOutputStream('d:/pri64'));
  o.println(new sun.misc.BASE64Encoder().encode(pri_e));
  o.close();
  java.io.BufferedReader br = new java.io.BufferedReader(new java.io.FileReader('d:/pub64'));
  StringBuffer keyBase64 = new StringBuffer();
  String line = br.readLine ();
  while(line != null)
  keyBase64.append (line);
  line = br.readLine ();
  byte [] pubBytes = new sun.misc.BASE64Decoder().decodeBuffer(keyBase64.toString ());
  br = new java.io.BufferedReader(new java.io.FileReader('d:/pri64'));
  keyBase64 = new StringBuffer();
  line = br.readLine ();
  while(line != null)
  keyBase64.append (line);
  line = br.readLine ();
  byte [] priBytes = new sun.misc.BASE64Decoder().decodeBuffer(keyBase64.toString ());
  java.security.KeyFactory kf = java.security.KeyFactory.getInstance('RSA','BC');
  java.security.Key pubKey = kf.generatePublic(new java.security.spec.X509EncodedKeySpec(pubBytes));
  System.out.println('pub: ' + pubKey);
  java.security.Key priKey = kf.generatePrivate(new java.security.spec.PKCS8EncodedKeySpec(priBytes));
  System.out.println('pri: ' + priKey);
  catch(Exception e)
  e.printStackTrace ();
  }

• Dear all, I need help with the colour profile of my photoshop CS6.
  I've taken a photo with my Canon DSLR. When I opened the raw with ACDSee, the colour looks perfectly ok.
  So I go ahead and open in photoshop. I did nothing to the photo. It still looks ok
  Then I'm prompt the Embedded Profile Mismatch error. I go ahead and choose Discard the embedded profile option
  And the colour started to get messed up.
  And the output is a total diasater
  Put the above photo side by side with the raw, the red has became crimson!!
  So I tried the other option, Use the embedded profile
  The whole picture turns yellowish in Photoshop's interface
  And the output is just the same as the third option.
  Could someone please guide me how to fix this? Thank you.

  I'm prompt the Embedded Profile Mismatch error. I go ahead and choose Discard the embedded profile option
  always use the embedded profile when opening tagged images in Photoshop - at that point Photoshop will convert the source colors over to your monitor space correctly
  if your colors are wrong at that point either your monitor profile is off, or your source colors are not what you think they are - if other apps are displaying correctly you most likely have either a defective monitor profile or source profile issues
  windows calibrate link:
  http://windows.microsoft.com/en-US/windows7/Calibrate-your-display
  for Photoshop to work properly, i recall you want to have 'use my settings for this device' checked in Color Management> Device tab
  you may want to download the PDI reference image to check your monitor and print workflows
  and complete five easy steps to profile enlightenment in Photoshop
  with your settings, monitor profile and source profiles sorted out it should be pretty easy to pinpoint the problem..

• My G4 17', bought December 2004, is considered an antique by Apple, and no longer supported. (I now mostly use my early 2011 MacBookPro.)
  But the big screen on by G4 is very useful for Sibelius 4, the music program I mostly use (Sibelius 7 in the MacBookPro - but much too fussy for me.)
  Sibelius 4 in the G4 continues to work flawlessly.
  But my email account recently sort of died. It's POP account (whatever that means). I can no longer receive messages, BUT I can still create and
  send new messages, and of course forward any saved message to myself in the MacBookPro.
  ALSO: if I have to shut down the G4, it usually reopens with a horizontally divided display, and it usually takes many restarts before it will open
  will a full screen display (seems to reopen correctly more often if left in a cool place overnight.)
  Can anyone help with one or both these issues? I want to keep the G4 going as long as I can. BTW, I don't use it for browsing anyone, Safari installed,
  because it is now so slow. The MacBookPro handles all that for me.
  Thanks very much, James Johnson in Plattsburgh NY (where it is still cold and wintry, o f--k)

  To RCCHARLES: THANKS !!!! I did the safe boot start, following the link you provided, then waited, and waited, and waited, and ---
  Well that is interesting. Amoung other things safe boot does:
  -- check and fixes up your file system. The files system allows you to keep files on your harddrive.
  -- Does all video rendering in software.
  You could have a one time glitch or harddrive is slowly failing. If you never replaced the harddrive, it is time for a new one.
  You may want to consider getting a new harddrive. The easiest way is to get an external drive. No disassembly of the machine is required.
  You need an external Firewire drive to boot a PowerPC Mac computer [ a few G5's will boot from USB ].
  I recommend you do a google search on any external harddrive you are looking at.
  I bought a low cost external drive enclosure. When I started having trouble with it, I did a google search and found a lot of complaints about the drive enclosure. I ended up buying a new drive enclosure. On my second go around, I decided to buy a drive enclosure with a good history of working with Macs. The chip set seems to be the key ingredient. The Oxford line of chips seems to be good. I got the Oxford 911.
  I'd give OWC a call. 1-815-338-8685.
  FireWire 800 + USB 3, + eSATA
  save a little money interface:
  FireWire 400 + USB 2.0
  This web page lists both external harddrive types. You may need to scroll to the right to see both.
  http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB
  (2) FireWire 800/400 Ports (Up to 100MB/s / 50MB/s)
  (1) USB 3.0 Port (Up to 500MB/s / 60MB/s)
  (1) eSATA Port (Up to 300MB/s)
  Has a combo firewire 800/400 port. Drivers franklin. Not sure what this is. Looks like you will need 400 cable.
  http://eshop.macsales.com/shop/ministack

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Important

What Is A Usb Devices

This topic is for programmers. If you are a customer experiencing USB problems, see Troubleshoot common USB problems

This topic lists the Microsoft-provided drivers for the supported USB device classes.

• Microsoft-provided drivers for USB-IF approved device classes.
• For composite devices, use USB Generic Parent Driver (Usbccgp.sys) that creates physical device objects (PDOs) for each function.
• For non-composite devices or a function of a composite device, use WinUSB (Winusb.sys).

If you are installing USB drivers: You do not need to download USB device class drivers. They are installed automatically. These drivers and their installation files are included in Windows. They are available in the WindowsSystem32DriverStoreFileRepository folder. The drivers are updated through Windows Update.

If you are writing a custom driver: Before writing a driver for your USB device, determine whether a Microsoft-provided driver meets the device requirements. If a Microsoft-provided driver is not available for the USB device class to which your device belongs, then consider using generic drivers, Winusb.sys or Usbccgp.sys. Write a driver only when necessary. More guidelines are included in Choosing a driver model for developing a USB client driver.

USB Device classes

USB Device classes are categories of devices with similar characteristics and that perform common functions. Those classes and their specifications are defined by the USB-IF. Each device class is identified by USB-IF approved class, subclass, and protocol codes, all of which are provided by the IHV in device descriptors in the firmware. Microsoft provides in-box drivers for several of those device classes, called USB device class drivers. If a device that belongs to a supported device class is connected to a system, Windows automatically loads the class driver, and the device functions with no additional driver required.

Hardware vendors should not write drivers for the supported device classes. Windows class drivers might not support all of the features that are described in a class specification. If some of the device's capabilities are not implemented by the class driver, vendors should provide supplementary drivers that work in conjunction with the class driver to support the entire range of functionality provided by the device.

For general information about USB-IF approved device classes see the USB Common Class Specification

The current list of USB class specifications and class codes is documented in the USB-IF Defined Class Code List.

Device setup classes

Windows categorizes devices by device setup classes, which indicate the functionality of the device.

Microsoft defines setup classes for most devices. IHVs and OEMs can define new device setup classes, but only if none of the existing classes apply. For more information, see System-Defined Device Setup Classes.

Drivers grundig business online. Two important device setup classes for USB devices are as follows:

• USBDevice {88BAE032-5A81-49f0-BC3D-A4FF138216D6}: IHVs must use this class for custom devices that do not belong to another class. This class is not used for USB host controllers and hubs.

• USB {36fc9e60-c465-11cf-8056-444553540000}: IHVs must not use this class for their custom devices. This is reserved for USB host controllers and USB hubs.

The device setup classes are different from USB device classes discussed earlier. For example, an audio device has a USB device class code of 01h in its descriptor. When connected to a system, Windows loads the Microsoft-provided class driver, Usbaudio.sys. In Device Manager, the device is shown under is Sound, video and game controllers, which indicates that the device setup class is Media.

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