If there are two synchronized methods in one class.

If there are two synchronized methods in one class then what will be the beheviour of the threads accessing the methods.

Synchronization is on objects, not methods or classes. A thread, entering a synchronized method, synchronizes on the object on which that method is called. Another thread, attempting to synchronize on that object, will be made to wait until the first thread releases it.

Similar Messages

  • There are two CDC methods - Source based CDC and Target based CDC which one

    There are two CDC methods - Source based CDC and Target based CDC, which one is better performancewise. in data services.
    If there is any document available which compares both and provides any info on performance etc, will be helpful.
    thank you for the helpful info.

    LIke Suneer mentioned CDC is for better performance.
    Following link would be helpful.
    http://wiki.sdn.sap.com/wiki/display/BOBJ/Extractors-Source-Based+CDC
    http://wiki.sdn.sap.com/wiki/display/BOBJ/Extractors-Target-Based+CDC
    Thanks,
    Arun

  • Why there are two init methods?

    I copied this code from netbeans for a JApplet.. and it has two init methods
    One is public void init() that calls another initComponents() method.
    And the initComponents() method has all the components defined in it, and it is private.
    I replaced private with public and changed initComponents to init, and then deleted all the init method, it worked that way.
    But why there two methods when you can put every thing in single init() method?
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            try {
                java.awt.EventQueue.invokeAndWait(new Runnable() {
                    public void run() {
                        initComponents();
            } catch (Exception ex) {
                ex.printStackTrace();
        }

    BDLH:
    WWJD? Probably code in Ruby, but I digress. No, he would define an abstract base for that boilerplate code:
    import java.awt.*;
    import java.lang.reflect.*;
    import javax.swing.*;
    public abstract class AbstractApplet extends JApplet {
         public void init() {
              try {
                   EventQueue.invokeAndWait(new Runnable() {
                        public void run() {
                             initComponents();
              } catch (InterruptedException ex) {
                   ex.printStackTrace();
              } catch (InvocationTargetException ex) {
                   ex.printStackTrace();
         protected abstract void initComponents();
         //ditto: start, stop, distroy
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  • Why can't I go to playback and there are two SE icons in Task Manager?

    I'm having several problems after upgrading to SE 3.0. 
    1.  Whenever I need to close SE in the Task manager, there are two SE icons under the Applications tab, is this normal?
    2. I had a previous SE installed which was purchased with a USB DAQ device, no more than one year ago.  This error came from one of the old project, that used to work.  The error occurs while trying to RECORD  a waveform using SIGNAL TRIGGER.  Using DAQmx acquire and Configured for N SAMPLES, the program locks up showing "Recording" in the PROJECT window.  If I look at the log file, it continously logs, instead of stopping at my 1 s duration.  This problem resolves when I setup the acquired signal for CONTINUOUS SAMPLES, but it used to work before I upgraded the software.  (The software may have been the same version - it was only 1 year old.)
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    Thanks for your help.

    Scott M,
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    Sincerely,
    Jason Daming
    Applications Engineer
    National Instruments
    http://www.ni.com/support

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    Requirements:
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      Sales Organization:
      Distribution Channel:
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      Distribution Channel:
      Division:
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    Sales Organization:
    Distribution Channel:
    Division:
    So how should I make these parameters invisible depending on the transaction codes execution.
    I have an idea of using MODIF ID, LOOPING AT SCREEN...MODIFY SCREEN.
    I have an idea of using SY-TCODE.
    EX:
    AT SELECTION-SCREEN OUTPUT.
    IF SY-TCODE = 'ZJPVCS303'.
    LOOP AT SCREEN.
    IF SCREEN-GROUPID = 'GRP'.
       SCREEN-INPUT   = 0.
       SCREEN-INVISIBLE = 1.
       MODIFY SCREEN.
    ENDIF.
    ENDLOOP.
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    IF .....
    ENDLOOP.
    ENDIF.
    ENDIF.
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    Hello Rani
    Basically the transaction determines whether upload starts from application server (AS) or presentation server (PC). Thus, you will have the following parameter:
    PARAMETERS:
      p_as_fil          TYPE filename   MODIF ID unx,  " e.g. Unix server
      p_pc_fil          TYPE filename   MODIF ID wnd.  " e.g. Windows PC
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      CASE syst-tcode.
    *   transaction(s) for upload from server (AS)
        WHEN 'ZJPVCS303.
          LOOP AT screen.
            IF ( screen-group1 = 'UNX' ).
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              screen-invisible = 1.
              MODIFY screen.
            ENDIF.
          ENDLOOP.
    *   transaction(s) for upload from local PC (PC)
        WHEN 'ZJPVCS303_US.
          LOOP AT screen.
            IF ( screen-group1 = 'WND' ).
              screen-input = 0.
              screen-invisible = 1.
              MODIFY screen.
            ENDIF.
          ENDLOOP.
       WHEN others.
       ENDCASE.
    Regards
      Uwe

  • I have two apple id's because my hotmail account is no longer active. How can I delete the old one and use or update the new one?  Every time I try it won't allow me and now my iPad thinks there are two accounts and they are arguing with each other. Help!

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  • There are two iMacs connected through same router in my house but one refuses to login to facebook and other logged in sites. local techies are bemused, I have just reinstalled OSX and still have the problem. Login page recycles and no errors reported.

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  • I have just owned a macbook pro and trying to learn things since i have all along used windows laptop. My first question is : when there are two files i am working together, one above the other on screen, how you switch over between the two with key ?

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  • On iOS 7.0.2, after web (OTA) installation there are two icons for the app on the home screen; one is invalid.

    Hello,
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    Expected Results:
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    Notes:
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  • Setting XML based exam to where there are two correct answers in a question

    I have an exam which pulls in questions from an XML file and to indicate what the correct answer is you would indicate in the XML as such:
    PROBLEM id="1">
                    <QUESTION>What is the State Capital of California:</QUESTION>
                    <CHOICE letter="a">San Fransisco.</CHOICE>
                    <CHOICE letter="b">San Diego.</CHOICE>
                    <CHOICE letter="c">Los Angelas.</CHOICE>
                    <CHOICE letter="d" correct="true">Sacremento.</CHOICE>
                </PROBLEM>
    There is one question, that is structured so there are two right answers, but when I add correct="true" to both answers I want as right only one is calculated correctly in the scoring. I thinking I need to make an adjustment in the code that pulls in the XML, but not sure where. Hoping someone can help.
    Here is the AS code.
    package exam {
        import flash.net.* //to create URLRequest and load XML file
        import flash.events.* //for Load events
        //import flash.display.* //for testing purposes - remove when testing complete
        //This class downloads the XML document, and then inserts info into arrays and variables.
        //Also provides text of questions and correct answers when requested.
        internal class XaMLDiplomat extends EventDispatcher {
            //VARIABLES:
            //for loaded XML doc
            private var myXML:XML;
            //for loading in XML
            private var examLoader:URLLoader;
            private var numQstns:Number; //count of total questions in a section
            private var sectStart:Number;
            //contains exam questions - ALL ARRAYS ARE ZERO RELATIVE -> actual question numbers = array index + 1
            private var questions:Array;
            //contain associated answer choices
            private var choiceA:Array;
            private var choiceB:Array;
            private var choiceC:Array;
            private var choiceD:Array;
            private var choiceE:Array;
            private var choiceF:Array;
            //array of the correct answers
            private var answers:Array;
            //use custom Mixer class to randomize order
            private var myMixer:Mixer;
            private var isRandom:Boolean;
            //CONSTRUCTOR
            public function XaMLDiplomat () { //NEED TO ADD ARGUMENTS (docLocation)
                //create URLRequest from argument
                var examSite:URLRequest = new URLRequest("protected/exam.xml");
                //create a loader for the XML
                examLoader = new URLLoader();
                //add listener for load completion
                examLoader.addEventListener(Event.COMPLETE, fullyLoaded);
                examLoader.load(examSite);
                //var ugly:Mixer = new Mixer(25);
            //Load listener - creates XML object, and checks it for multiple sections. If multiple, it asks users
            //which section they want - FIRST it needs to check database for any completed sections.
            //If single, it goes ahead and starts array creation for first (& only) section
            private function fullyLoaded (e:Event):void {
                myXML = new XML(examLoader.data);
                //myXML.prettyPrinting = false;
                //still need to pull out SYSTEM data and pass it along...
                var system:XMLList = myXML..SYSTEM;
                var sysObj:Object = new Object();
                sysObj.examTitle = system.TITLE.toString();
                sysObj.totalMin = system.MINUTES.toString();
                sysObj.retakePW = system.RETAKEPW.toString();
                var numSections:Number = myXML..SECTION.length();
                if (numSections == 1) {
                    generateArrays(1);
                dispatchEvent(new MultiSectEvent(MultiSectEvent.SECTIONS, numSections, sysObj));
            //Assigns arrays to instance variables for the selected section
            internal function generateArrays (sectn:Number):void {
                var whichSection:XMLList = myXML..SECTION.(@id == String(sectn));
                var probList:XMLList = whichSection.PROBLEM;
                numQstns = probList.length();
                sectStart = Number(probList[0].@id);
                questions = new Array();
                choiceA = new Array();
                choiceB = new Array();
                choiceC = new Array();
                choiceD = new Array();
                choiceE = new Array();
                choiceF = new Array();
                answers = new Array();
                for (var i:Number=0; i<numQstns; i++) {
                    var curProb:XMLList = probList.(@id == String(i+1));
                    if (curProb.QUESTION.hasSimpleContent()) {
                        questions[i] = curProb.QUESTION.toString();
                    }else {
                        //trace(curProb.QUESTION.toXMLString());
                        questions[i] = dropTags(curProb.QUESTION[0]);
                    choiceA[i] = curProb.CHOICE.(@letter == "a").toString();
                    choiceB[i] = curProb.CHOICE.(@letter == "b").toString();
                    choiceC[i] = curProb.CHOICE.(@letter == "c").toString();
                    choiceD[i] = curProb.CHOICE.(@letter == "d").toString();
                    choiceE[i] = curProb.CHOICE.(@letter == "e").toString();
                    choiceF[i] = curProb.CHOICE.(@letter == "f").toString();
                    answers[i] = curProb.CHOICE.(hasOwnProperty("@correct") && @correct == "true")[email protected]();
                //randomizing test
                //var makeRandom:Boolean;
                //system.RANDOM.toString() ==  'true' ? makeRandom = true : makeRandom = false;
                //myMixer = new Mixer(numQstns,makeRandom);
                trace("Question: "+questions[3]);
                trace("a: "+choiceA[3]);
                trace("b: "+choiceB[3]);
                trace("c: "+choiceC[3]);
                trace("d: "+choiceD[3]);
                trace("\r\n answer: "+answers[3]); */
            //method for external classes to acquire text of current exam question
            internal function getQuestion (qnum:Number):Object {
                var returnObj:Object = new Object();
                var randomQ:Number = myMixer.getRandomNumber(qnum-1);
                returnObj.q = questions[randomQ];
                returnObj.ca = choiceA[randomQ];
                returnObj.cb = choiceB[randomQ];
                returnObj.cc = choiceC[randomQ];
                returnObj.cd = choiceD[randomQ];
                returnObj.ce = choiceE[randomQ];
                returnObj.cf = choiceF[randomQ];
                returnObj.num = qnum;
                //trace(randomQ);
                return returnObj;
            private function dropTags (txt:XML):String {
                var txtString:String = "";
                for each (var child:XML in txt.*) {
                    if (child.nodeKind == "text") {
                        txtString += child.toString();
                    }else {
                        txtString += " " + child.toXMLString();
                //trace(txtString);
                return txtString;
            private function dropTags (txt:String):String {
                var sliceStart:Number = txt.indexOf(">");
                var sliceStop:Number = txt.lastIndexOf("<");
                return txt.slice((sliceStart+1), sliceStop);
            internal function getAnswer (num:Number):String {
                return answers[num];
            internal function getQCount ():Number {
                return numQstns;
            internal function getSectStart():Number {
                return sectStart;
            internal function getRealNum (num:Number):Number {
                return myMixer.getRandomNumber(num-1);

    this may or may not be the probel, but as it stands right now, when you select and anser it becomes hi-lighted and when you click off and select another answer the previous answer is deselected and the current answer is hi-lighted. I need to allow for multiple selections. This code is what is doing to current select/de-select functionality.
    package exam {
        import flash.display.*;
        import flash.events.*;
        import flash.text.*;
        //This class displays the current question, and contains the Choices for the question
        public class QMachine extends Sprite {
            //VARIABLES
            private var QObject:Object; //object from XaMLDiplomat, containing necessary text
            private var limit:Number;
            private var QNumTxt:TextField;
            private var QTxt:TextField;
            private var txtStyle:StyleSheet;
            private var choiceA:Choice;
            private var choiceB:Choice;
            private var choiceC:Choice;
            private var choiceD:Choice;
            private var choiceE:Choice;
            private var choiceF:Choice;
            //CONSTRUCTOR
            public function QMachine (hite:Number) {
                limit = hite;
                var style:Object = new Object();
                style.fontFamily = "Arial";
                //style.fontWeight = "bold";
                style.fontSize = "16";
                style.color = "#333333";
                txtStyle = new StyleSheet();
                txtStyle.setStyle("p",style);
                QNumTxt = new TextField();
                QNumTxt.styleSheet = txtStyle;
                //QNumTxt.embedFonts = true;
                QNumTxt.htmlText = "<p>1) </p>";
                QNumTxt.autoSize = TextFieldAutoSize.RIGHT;
                QNumTxt.x = 10;
                QNumTxt.mouseEnabled = false;
                QTxt = new TextField();
                QTxt.styleSheet = txtStyle;
                //QTxt.embedFonts = true;
                QTxt.width = 300;
                QTxt.multiline = true;
                QTxt.wordWrap = true;
                QTxt.autoSize = TextFieldAutoSize.LEFT;
                QTxt.htmlText = "<p>Question 1</p>";
                QTxt.x = 35;
                QTxt.mouseEnabled = false;
                addChild(QNumTxt);
                addChild(QTxt);
                choiceA = new Choice("a");
                choiceA.x = 350;
                addChild(choiceA);
                choiceB = new Choice("b");
                choiceB.x = 350;
                addChild(choiceB);
                choiceC = new Choice("c");
                choiceC.x = 350;
                addChild(choiceC);
                choiceD = new Choice("d");
                choiceD.x = 350;
                addChild(choiceD);
                choiceE = new Choice("e");
                choiceE.x = 350;
                addChild(choiceE);
                choiceF = new Choice("f");
                choiceF.x = 350;
                addChild(choiceF);
                addEventListener(MouseEvent.MOUSE_UP, selectResponse, true);
            internal function newQuestion (obj:Object, prior:String = ""):void {
                //trace(obj.num);
                QNumTxt.htmlText = "<p>"+ obj.num + ".</p>";
                QTxt.htmlText = "<p>"+ obj.q + "</p>";
                choiceA.deselect();
                choiceB.deselect();
                choiceC.deselect();
                choiceD.deselect();
                choiceE.deselect();
                choiceF.deselect();
                choiceA.resetSize();
                choiceB.resetSize();
                choiceC.resetSize();
                choiceD.resetSize();
                choiceE.resetSize();
                choiceF.resetSize();
                choiceA.changeTxt(obj.ca);
                choiceB.changeTxt(obj.cb);
                choiceB.y = choiceA.height + 5;
                if (obj.cc == undefined || String(obj.cc) == "") {
                    choiceC.visible = false;
                }else {
                    choiceC.changeTxt(obj.cc);
                    choiceC.y = choiceB.y + choiceB.height + 5;
                    choiceC.visible = true;
                if (obj.cd == undefined || String(obj.cd) == "") {
                    choiceD.visible = false;
                }else {
                    choiceD.changeTxt(obj.cd);
                    choiceD.y = choiceC.y + choiceC.height + 5;
                    choiceD.visible = true;
                if (obj.ce == undefined || String(obj.ce) == "") {
                    choiceE.visible = false;
                }else {
                    choiceE.changeTxt(obj.ce);
                    choiceE.y = choiceD.y + choiceD.height + 5;
                    choiceE.visible = true;
                if (obj.cf == undefined || String(obj.cf) == "") {
                    choiceF.visible = false;
                }else {
                    choiceF.changeTxt(obj.cf);
                    choiceF.y = choiceE.y + choiceE.height + 5;
                    choiceF.visible = true;
                var curHite:Number;
                if (choiceF.visible) {
                    curHite = choiceF.y + choiceF.height + 5;
                }else if (choiceE.visible) {
                    curHite = choiceE.y + choiceE.height + 5;
                }else if (choiceD.visible) {
                    curHite = choiceD.y + choiceD.height + 5;
                }else {
                    curHite = choiceC.y + choiceC.height + 5;
                if (curHite > (limit-150)) {
                    shrinkText();
                if (prior != "") {
                    if (prior == "a") {
                        choiceA.nowSelected();
                    }else if (prior == "b") {
                        choiceB.nowSelected();
                    }else if (prior == "c") {
                        choiceC.nowSelected();
                    }else if (prior == "d") {
                        choiceD.nowSelected();
                    }else if (prior == "e") {
                        choiceE.nowSelected();
                    }else if (prior == "f") {
                        choiceF.nowSelected();
            private function shrinkText() {
                choiceA.dropSize();
                choiceB.dropSize();
                choiceC.dropSize();
                choiceD.dropSize();
                choiceE.dropSize();
                choiceF.dropSize();
                choiceB.y = choiceA.y + choiceA.height + 5;
                choiceC.y = choiceB.y + choiceB.height + 5;
                choiceD.y = choiceC.y + choiceC.height + 5;
                choiceE.y = choiceD.y + choiceD.height + 5;
                choiceF.y = choiceE.y + choiceE.height + 5;
                var curHite:Number = 0;
                if (choiceF.visible) {
                    curHite = choiceF.y + choiceF.height + 5;
                }else if (choiceE.visible) {
                    curHite = choiceE.y + choiceE.height + 5;
                }else if (choiceD.visible) {
                    curHite = choiceD.y + choiceD.height + 5;
                }else {
                    curHite = choiceC.y + choiceC.height + 5;
                if (curHite > (limit-150)) {
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