Create an instance of a class from another

Hello,
I made a BADI and inside the implementation CLASS y want to call a CLASS specialized in creating random numbers (CL_ABAP_RANDOM_INT).
What should I do  to be able to call this class methods inside my class implementation.
Kind Regards.

Hello David
Simply add a static attribute (e.g. MO_RANDOM of TYPE REF TO cl_abap_random_int) to your BAdI implementing class.
Next I would add a CLASS_CONSTRUCTOR method to the BAdI implementing class:
METHOD class_constructor.
  mo_random = cl_abap_random_int=>create( ).  " or you feed the IMPORTING parameters
ENDMETHOD.
Now you can call in every method of your BAdI implementing class the methods of instance MO_RANDOM.
Regards
  Uwe

Similar Messages

  • Creating an instance of a class from within another class

    I am trying to create an instance of MCQ in the T class but I am getting this error:
    File: E:\JAVA PROGRAMS\assignment 1\T.java [line: 15]
    Error: cannot find symbol
    symbol : class MCQ
    location: class T
    here are the two classes:
    // class T
    import java.awt.*;
    import java.util.*;
    import java.lang.*;
    public class T{
    public T(String aT)
    pest = aT;
    public static T t_one()
    T aT = new T("Calculator");
    aT.addQ(new MCQ( " 2 + 2", "equals 4", "equals 5", "equals 0", " equals -2",
    "is a prime number", 1));
    return aT;
    private String pest;
    //class Q
    import java.awt.*;
    import java.util.*;
    import java.lang.*;
    public abstract class Q{
    Vector q = new Vector();
    public String aT;
    abstract void addQ(Q aQ);
    public class MCQ extends Q{
    String a,b,c,d,e,f,g;
    int answer;
    public MCQ (String a, String b, String c, String d, String e, int answer)
    this.a = a;
    this.b = b;
    this.c = c;
    this.d = d;
    this.e = e;
    this.answer = answer;
    void addQ(Q aQ)
    q.addElement(new T(aT));
    I tried to make reference to MCQ by doing this in class T:
    MCC qT = new MCQ() ;
    but that presents a whole other set of problems.
    please help I think I have tried everything!

    Use code tags (http://forum.java.sun.com/help.jspa?sec=formatting)
    Don't import java.lang.* . You get those automatically.
    Your MCQ class is really Q.MCQ (the way you posted, anyway).
    If Q weren't abstract, you could do:
    new Q().new MCQ(...)But, you can't create a Q without defining 'add'. You could do it anonymously, but that makes no sense. Put Q and MCQ in separate files and try again.

  • Create an instance of a class from class name

    Hi,
    I have the class name as a String variable. I need to create an instance from this class. How to do it in Java?
       Thanks and regards, Marina

    Hello
    see
    [http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Class.html#forName(java.lang.String)]
    and
    [http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Class.html#newInstance()]
    for Classes with paramterless constructor
    or
    [http://java.sun.com/j2se/1.4.2/docs/api/java/lang/reflect/Constructor.html#newInstance(java.lang.Object[])]
    for Constructor with parameters
    regards franz

  • How to create an instance of a class?

    how do you create sn instance of a class, and how do you call a method from another class?

    You may need to read thru the information provided on this page to understand how to create objects: http://java.sun.com/docs/books/tutorial/java/data/objectcreation.html
    I'd also suggest you read the tutorial available at: http://java.sun.com/docs/books/tutorial/java/index.html
    Regarding how you call a method belonging to another class you could do it in the foll. ways depending on whether the method is static or not - a static method may be called using the class name followed by a dot and the static method name while a non-static method would require you to create an instance of the class and then use that instance name followed by a dot and the method name. All said and done i'd still suggest you read thru the complete Java programming tutorial to get a good grounding on all these concepts and fundamentals of the language if you are looking to master the technology.
    Thanks
    John Morrison

  • How to call a Java class from another java class ??

    Hi ..... can somebody plz tell me
    How to call a Java Class from another Java Class assuming both in the same Package??
    I want to call the entire Java Class  (not any specific method only........I want all the functionalities of that class)
    Please provide me some slotuions!!
    Waiting for some fast replies!!
    Regards
    Smita Mohanty

    Hi Smita,
    you just need to create an object of that class,thats it. Then you will be able to execute each and every method.
    e.g.
    you have developed A.java and B.java, both are in same package.
    in implementaion of B.java
    class B
                A obj = new A();
                 //to access A's methods
                 A.method();
                // to access A's variable
                //either
               A.variable= value.
               //or
               A.setvariable() or A.getvariable()

  • Calling a method of one class from another withing the same package

    hi,
    i've some problem in calling a method of one class from another class within the same package.
    for eg. if in Package mypack. i'm having 2 files, f1 and f2. i would like to call a method of f2 from f1(f1 is a servlet) . i donno exactly how to instantiate the object for f2. can anybody please help me in this regard.
    Thank u in advance.
    Regards,
    Fazli

    This is what my exact problem.
    i've created a bean (DataBean) to access the database. i'm having a servlet program (ShopBook). now to check some details over there in the database from the servlet i'm in need to use a method in the DataBean.
    both ShopBook.java and DataBean.java lies in the package shoppack.
    in ShopBook i tried to instantiate the object to DataBean as
    DataBean db = new DataBean();
    it shows the compiler error, unable to resolve symbol DataBean.
    note:
    first i compiled DataBean.java, it got compiled perfectly and the class file resides inside the shoppack.
    when i'm trying to compile the ShopBook its telling this error.
    hope i'm clear in explaining my problem. can u please help me?
    thank u in advance.
    regards,
    Fazli

  • Importing a class from another context?

    Hi JSP techies,
    Im using RESIN and having a simple problem of figuring out how to import classes from another context, if Im using the right word.
    ie.
    My .jsp files are under $home/resin/doc/test dir. And in the jsp file, I would like to import a servlet class or a plain java class. But the servlet classes and all other classes are located under $home/resin/webapps/project/WEB-INF/classes/a/b/c
    Hence when I say
    <% page import="a.b.c.*" %>
    I get an error saying "a" not found.
    1. When I say "servlet classes are in a different CONTEXT", is that right? or is it just another directory?
    2. How can I make the jsp file import the classes from the servlets class path?
    Note: Ofcourse, when I copy the package to the
    $home/resin/doc/WEB-INF/classes dir, everything works fine. But thats simply not an efficient way to get around. Could anyone clear my doubts on this regd.?
    Thanks in advance.
    Arun

    Oh... I get it now. I'm sorry, I had you poorly misunderstood. You are trying to import servlets from another web app or servlet context. I would suggest you put servlets that are common to all web apps in the system classpath and not tie them to any particular web app. In other words create a package directory structure from the system's root directory or any where outside of any web apps and point the system classpath to the beginning of that directory structure. I have a similar thing going with Tomcat. I have a folder in my root called Java_Class which is in my classpath. I build all common utilities in this directory. So I have a com/craig/web structure that holds my AppServlet which is in package com.craig.web. This servlet is visible to all web apps via the Windows classpath. Servlets particular to an application like say an MusicOrderProcess servlet would reside in a package under the webserverhome/webapps/MusicStore/WEB-INF/classes directory where webserver home is the home directory of the webserver you are using. I've tested this across webservers as well (orionserver and Tomcat) and it works.
    From the prompt you include in your posts I am guessing that you are running on UNIX. Move your common servlets out of their respective web apps and into a common directory structure. Configure the UNIX $CLASSPATH (or is it $classpath?) environment variable to point to this sturcture and you'll be on your way!
    Post again if you have more questions!

  • Accessing a variable defined in one class from another class..

    Greetings,
    I've only been programming in as3 for a couple months, and so far I've written several compositional classes that take MovieClips as inputs to handle behaviors and interactions in a simple game I'm creating. One problem I keep coming upon is that I'd love to access the custom variables I define within one class from another class. In the game I'm creating, Main.as is my document class, from which I invoke a class called 'Level1.as' which invokes all the other classes I've written.
    Below I've pasted my class 'DieLikeThePhishes'. For example, I would love to know the syntax for accessing the boolean variable 'phish1BeenHit' (line 31) from another class. I've tried the dot syntax you would use to access a MovieClip inside another MovieClip and it doesn't seem  to be working for me. Any ideas would be appreciated.  Thanks,
    - Jeremy
    package  jab.enemy
    import flash.display.MovieClip;
    import flash.events.Event;
    import jab.enemy.MissleDisappear;
    public class DieLikeThePhishes
    private var _clip2:MovieClip; // player
    private var _clip3:MovieClip; //phish1
    private var _clip4:MovieClip; //phish2
    private var _clip5:MovieClip; //phish3
    private var _clip6:MovieClip; //phish4
    private var _clip10:MovieClip; // background
    private var _clip11:MovieClip // missle1
    private var _clip12:MovieClip // missle2
    private var _clip13:MovieClip // missle3
    private var _clip14:MovieClip // missle4
    private var _clip15:MovieClip // missle5
    private var _clip16:MovieClip // missle6
    private var _clip17:MovieClip // missle7
    private var _clip18:MovieClip // missle8
    private var _clip19:MovieClip // missle9
    private var _clip20:MovieClip // missle10
    private var _clip21:MovieClip // missle11
    private var _clip22:MovieClip // missle12
    var ay1 = 0;var ay2 = 0;var ay3 = 0;var ay4 = 0;
    var vy1 = 0;var vy2 = 0;var vy3 = 0;var vy4 = 0;
    var phish1BeenHit:Boolean = false;var phish2BeenHit:Boolean = false;
    var phish3BeenHit:Boolean = false;var phish4BeenHit:Boolean = false;
    public function DieLikeThePhishes(clip2:MovieClip,clip3:MovieClip,clip4:MovieClip,clip5:MovieClip,clip6:M ovieClip,clip10:MovieClip,clip11:MovieClip,clip12:MovieClip,clip13:MovieClip,clip14:MovieC lip,clip15:MovieClip,clip16:MovieClip,clip17:MovieClip,clip18:MovieClip,clip19:MovieClip,c lip20:MovieClip,clip21:MovieClip,clip22:MovieClip)
    _clip2 = clip2;_clip3 = clip3;_clip4 = clip4;_clip5 = clip5;_clip6 = clip6;
    _clip10 = clip10;_clip11 = clip11;_clip12 = clip12;_clip13 = clip13;_clip14 = clip14;
    _clip15 = clip15;_clip16 = clip16;_clip17 = clip17;_clip18 = clip18;_clip19 = clip19;
    _clip20 = clip20;_clip21 = clip21;_clip22= clip22;
    _clip3.stage.addEventListener(Event.ENTER_FRAME, onEnterFrame)
    function onEnterFrame(event:Event):void
    vy1+= ay1;_clip3.y += vy1; vy2+= ay2;_clip4.y += vy2;
    vy3+= ay3;_clip5.y += vy3; vy4+= ay4;_clip6.y += vy4;
    if (phish1BeenHit ==false)
    if(_clip3.y >620)
    {_clip3.y = 620;}
    if (phish2BeenHit ==false)
    if(_clip4.y >620)
    {_clip4.y = 620;}
    if (phish3BeenHit ==false)
    if(_clip5.y >620)
    {_clip5.y = 620;}
    if (phish4BeenHit ==false)
    if(_clip6.y >620)
    {_clip6.y = 620;}
    if (_clip11.hitTestObject(_clip3) ||_clip12.hitTestObject(_clip3)||_clip13.hitTestObject(_clip3)||_clip14.hitTestObject(_cl ip3)||_clip15.hitTestObject(_clip3)||_clip16.hitTestObject(_clip3)||_clip17.hitTestObject( _clip3)||_clip18.hitTestObject(_clip3)||_clip19.hitTestObject(_clip3)||_clip20.hitTestObje ct(_clip3)||_clip21.hitTestObject(_clip3)||_clip22.hitTestObject(_clip3))
    _clip3.scaleY = -Math.abs(_clip3.scaleY);
    _clip3.alpha = 0.4;
    ay1 = 3
    vy1= -2;
    phish1BeenHit = true;
    if (_clip11.hitTestObject(_clip4) ||_clip12.hitTestObject(_clip4)||_clip13.hitTestObject(_clip4)||_clip14.hitTestObject(_cl ip4)||_clip15.hitTestObject(_clip4)||_clip16.hitTestObject(_clip4)||_clip17.hitTestObject( _clip4)||_clip18.hitTestObject(_clip4)||_clip19.hitTestObject(_clip4)||_clip20.hitTestObje ct(_clip4)||_clip21.hitTestObject(_clip4)||_clip22.hitTestObject(_clip4))
    _clip4.scaleY = -Math.abs(_clip4.scaleY);
    _clip4.alpha = 0.4;
    ay2 = 3
    vy2= -2;
    phish2BeenHit = true;
    if (_clip11.hitTestObject(_clip5) ||_clip12.hitTestObject(_clip5)||_clip13.hitTestObject(_clip5)||_clip14.hitTestObject(_cl ip5)||_clip15.hitTestObject(_clip5)||_clip16.hitTestObject(_clip5)||_clip17.hitTestObject( _clip5)||_clip18.hitTestObject(_clip5)||_clip19.hitTestObject(_clip5)||_clip20.hitTestObje ct(_clip5)||_clip21.hitTestObject(_clip5)||_clip22.hitTestObject(_clip5))
    _clip5.scaleY = -Math.abs(_clip5.scaleY);
    _clip5.alpha = 0.4;
    ay3 = 3
    vy3= -2;
    phish3BeenHit = true;
    if (_clip11.hitTestObject(_clip6) ||_clip12.hitTestObject(_clip6)||_clip13.hitTestObject(_clip6)||_clip14.hitTestObject(_cl ip6)||_clip15.hitTestObject(_clip6)||_clip16.hitTestObject(_clip6)||_clip17.hitTestObject( _clip6)||_clip18.hitTestObject(_clip6)||_clip19.hitTestObject(_clip6)||_clip20.hitTestObje ct(_clip6)||_clip21.hitTestObject(_clip6)||_clip22.hitTestObject(_clip6))
    _clip6.scaleY = -Math.abs(_clip6.scaleY);
    _clip6.alpha = 0.4;
    ay4 = 3
    vy4= -2;
    phish4BeenHit = true;
    if (_clip3.y > 10000)
    _clip3.x = 1000 +3000*Math.random()-_clip10.x;
    _clip3.y = 300;
    _clip3.alpha = 1;
    _clip3.scaleY = Math.abs(_clip3.scaleY);
    ay1 = vy1 = 0;
    phish1BeenHit = false;
    if (_clip4.y > 10000)
    _clip4.x = 1000 +3000*Math.random()-_clip10.x;
    _clip4.y = 300;
    _clip4.alpha = 1;
    _clip4.scaleY = Math.abs(_clip4.scaleY);
    ay2 = vy2 = 0;
    phish2BeenHit = false;
    if (_clip5.y > 10000)
    _clip5.x = 1000 +3000*Math.random()-_clip10.x;
    _clip5.y = 300;
    _clip5.alpha = 1;
    _clip5.scaleY = Math.abs(_clip5.scaleY);
    ay3 = vy3 = 0;
    phish3BeenHit = false;
    if (_clip6.y > 10000)
    _clip6.x = 1000 +3000*Math.random()-_clip10.x;
    _clip6.y = 300;
    _clip6.alpha = 1;
    _clip6.scaleY = Math.abs(_clip6.scaleY);
    ay4 = vy4 = 0;
    phish4BeenHit = false;
    var missleDisappear1 = new MissleDisappear(_clip11,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear2 = new MissleDisappear(_clip12,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear3 = new MissleDisappear(_clip13,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear4 = new MissleDisappear(_clip14,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear5 = new MissleDisappear(_clip15,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear6 = new MissleDisappear(_clip16,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear7 = new MissleDisappear(_clip17,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear8 = new MissleDisappear(_clip18,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear9 = new MissleDisappear(_clip19,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear10 = new MissleDisappear(_clip20,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear11 = new MissleDisappear(_clip21,_clip3,_clip4,_clip5,_clip6,_clip10);
    var missleDisappear12 = new MissleDisappear(_clip22,_clip3,_clip4,_clip5,_clip6,_clip10);

    I would approach it in much the same way as you would in java, by making getters and setters for all of your class variables.
    Getters being for returning the values, Setters being for setting them.
    So you would make a get function for the variable you want to access ala:
    function get1PhishBeenHit():boolean {
         return this.phish1BeenHit;
    Then to access the value of that variable from outwith the class:
    var result:boolean = ClassInstanceName.get1PhishBeenHit();

  • Creating an instance of a class at runtime?

    Does anyone know how to create an instance of a class at RunTime? For example, I want to load classes from a JAR file at RunTime, and then create instances of certain classes of each JAR. I ask this because I do not see how to create an instance of one of those classes the traditional way, SomeClass var = new SomeClass(). I am pretty sure that someone out there has done this and succeeded in doing it. All of the post on this stuff only talk about loading the class from a JAR file, but I have already loaded them using URLClassLoader�s findClass() method. I have also created an instance of the class that findClass() returns using newInstance(), but newInstance() returns an object of type Object. How can I convert this object to an object of type SomeClass? You cannot cast it because the compiler will complain due to the import statement issue. So if you cannot include the import statement because that classpath does not exist, then how the heck would you cast the newInstance() object into a SomeClass object?

    You can cast the returned object to the type you need...that is what I do in my applet. The trick is that you must get the instance of the applets class loader (or you get a classCastException). Pay attention to this line below - that's the real key here.
    "// Get a reference to the applets own classloader"
    protected CBaseQuestionnaireFile m_BaseObject = null;// declared up front
    m_BaseObject = loadAndRunClass("com.cpm.dataentry.questionnaire.CQuestionnaireFile");// fully qualified base object
    Here is the load and run method:
       CBaseQuestionnaireFile loadAndRunClass(String classname)
          com.cpm.common.base.CBaseQuestionnaireFile questBase = null;
          Class cClass = null;
          try
             // first we open the jar file with the classes we need
             String[] aJarList = new String[10];
             // Questionnaire format file
             File fURL1 = new File(GetMainFrame().m_strQuestionnaireFileName);
             URL url1   = new URL(fURL1.toURL(),"");
             URL urlNew = new URL("jar:" + url1.toExternalForm() + "!/" );
             // Server base class directory
             String strServerDirectory = "http://" + GetMainFrame().m_strHost + "/APPLETS/";
             File fURL2 = new File(strServerDirectory);
             URL url2 = new URL(fURL2.toURL(),"");
             URL urlNew2 = new URL("jar:" + url2.toExternalForm() + "!/" );
             // Local base class directory
             String strLocalDirectory = CSystem.GetBasePath() + "/Research/bin/";
             File fURL3 = new File(strLocalDirectory);
             URL url3 = new URL(fURL3.toURL(),"");
             URL urlNew3 = new URL("jar:" + url3.toExternalForm() + "!/" );
             File fURLBase = new File(CSystem.GetBasePath() + "/Research/bin/base.jar");
             URL urlBase = new URL(fURLBase.toURL(),"");
             URL urlNewBase = new URL("jar:" + urlBase.toExternalForm() + "!/" );
             File fURLControl = new File(CSystem.GetBasePath() + "/Research/bin/controls.jar");
             URL urlControl = new URL(fURLControl.toURL(),"");
             URL urlNewControl = new URL("jar:" + urlControl.toExternalForm() + "!/" );
             File fURLUtil = new File(CSystem.GetBasePath() + "/Research/bin/utlities.jar");
             URL urlUtil= new URL(fURLUtil.toURL(),"");
             URL urlNewUtil = new URL("jar:" + urlUtil.toExternalForm() + "!/" );
             // Determine where to look
             URL[] urlList = null;
             if(GetMainFrame().m_isStandalone == false) {
                // From a browser
                CSystem.PrintDebugMessage("Running as an applet");
                if(GetMainFrame().m_bOnLineMode == true) {
                   // On line
                   CSystem.PrintDebugMessage("*** On Line Mode ***");
                   urlList = new URL[2];
                   urlList[0] = urlNew;
                   urlList[1] = urlNew2;
                else {
                   // Off line
                   CSystem.PrintDebugMessage("*** Off Line Mode ***");
                   urlList = new URL[4];
                   urlList[0] = urlNew;
                   urlList[1] = urlNewBase;
                   urlList[2] = urlNewControl;
                   urlList[3] = urlNewUtil;
              else {
                 CSystem.PrintDebugMessage("*** Stand Alone Mode ***");
                 urlList = new URL[1];
                 urlList[0] = urlNew;
    CSystem.PrintDebugMessage("Question file/path: " + GetMainFrame().m_strQuestionnaireFileName);
            // Set the wait cursor
            GetMainFrame().SetWaitCursor();
            // Get a reference to the applets own classloader
            Class myClass = getClass();
            ClassLoader appletClassLoader = myClass.getClassLoader();
            // Call our multi-jar class loader
            JarClassLoader jarLoader = new JarClassLoader(urlList,appletClassLoader);
    CSystem.PrintDebugMessage("CPM Test - passed Jar Loader" + jarLoader.toString());
             // Load the classname from the jarfile
             try
                  cClass = jarLoader.loadClass(classname);
             catch(ClassNotFoundException cnfe)
                Object[] optionsConfirm = { "Ok" };
                JOptionPane.showOptionDialog(GetMainFrame(),"Questionnaire file is either damaged or has been tampered with.", "Questionnaire File Error",
                JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null, optionsConfirm, optionsConfirm[0]);
                GetMainFrame().m_strQuestionnaireFileName = "";
                // Clear the wait cursor
                GetMainFrame().ClearWaitCursor();
                return null;
             Class cSuperclass = cClass.getSuperclass();
    CSystem.PrintDebugMessage("Test Superclass type is: " + cSuperclass.toString());
             Object o = cClass.newInstance();
    CSystem.PrintDebugMessage("Test plain class type is: " + o.toString());
             // Never remove this line of code
             // without it, a crafty user could use our load routine
             // to load/and run some nasty code
             // This test makes SURE that *ONLY* questionnaires get opened
             // and their methods get called
             if(o instanceof com.cpm.common.base.CBaseQuestionnaireFile)
                // Create the object
    CSystem.PrintDebugMessage("Test Is instance of CBaseQuestionnaireFile");
    CSystem.PrintDebugMessage("CPM Test - Casting to Base Class");
                questBase = (com.cpm.common.base.CBaseQuestionnaireFile)o;
    CSystem.PrintDebugMessage("CPM Test - Getting languages from questionnaire");
                GetMainFrame().GetLanguagesFromQuestionnaire(questBase);
    CSystem.PrintDebugMessage("CPM Test - Setting locale from Questionnaire selection");
                questBase.SetQuestionnaireLocale(GetMainFrame().m_locale);
    CSystem.PrintDebugMessage("CPM Test - Initializing Questionnaire");
                questBase.Initialize();
                questBase.InitializeCards();
              else
                Object[] optionsConfirm = { "Ok" };
                JOptionPane.showOptionDialog(GetMainFrame(),"Questionnaire file is either damaged or has been tampered with.", "Questionnaire File Error",
                JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null, optionsConfirm, optionsConfirm[0]);
                GetMainFrame().m_strQuestionnaireFileName = "";
                // Clear the wait cursor
                GetMainFrame().ClearWaitCursor();
                return null;
          catch (Exception e)
              exDialog.showForThrowable(e.toString(),e);
         // Clear the wait cursor
         GetMainFrame().ClearWaitCursor();
         // Set MouseListener Pointer
    //     questBase.SetMouseListenerPointer(GetMainFrame().m_mouseListener);
         return questBase;
       }

  • How Do I Run A Class From Another Class?

    Hiya everyone, id like to know how to run a class from another class.
    Ive got a Login class which extends a JFrame and a Personnel class which also extends a JFrame. When i press the login button (in Login class), ive got it to decide if password/login are acceptable and if they are, I want the Login class to close then run the Personnel class.
    Im just after the code which says to close this class and run the Personnel class. How do i do that?
    Ive researched this but couldnt get an understandable answer!
    Help would be much appreciated, Ant...

    This is the Login Class:
    public class MainMenu extends javax.swing.JFrame {
        Statement statement = null;
        int currentRecord;
        ResultSet rs = null;
        String name = null, job = null, mission = null, login = null, password = null;
        String loginVal;
        String passwordVal;
        /** Creates new form MainMenu */
        public MainMenu() {
            initComponents();
            try{
                Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                String filename = System.getProperty("user.dir") + "/src/Personnel.mdb";
                String database = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=" + filename;
                Connection conn = DriverManager.getConnection( database , "","");
                statement = conn.createStatement();
                System.out.println("Connected...ok");
            } catch (Exception e) {
                System.err.println("Got a connection Problem!");
                System.err.println(e.getMessage());
        private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {                                        
            loginVal = txtLogin.getText();
            passwordVal = txtPassword.getText();
            String name = null, job = null, mission = null, login = null, password = null;
            try{
                rs = statement.executeQuery("SELECT Login,Password FROM Personnel WHERE Login = '" + loginVal + "' ");
                System.out.println("TRYING SELECT CLAUSE");
                if(rs.next()){
                    System.out.println("THERE IS A NEXT RECORD");
                    login = rs.getString(1);
                    password = rs.getString(2);
                    System.out.println("GOT THE NEXT RECORD");
                    System.out.println(login + password);
                System.out.println("Query Complete");
            }catch(Exception s){
                //s.printStackTrace();
                System.out.println("NO RECORDS EXIST FOR THIS LOGIN ID");
            if(passwordVal.equals(password)){
                System.out.println("Access Granted"); //CLOSE MAIN AND RUN CONTROL CLASS
            } else{
                System.out.println("Access Denied"); //RE-RUN CLASS
        }                 

  • How to kill one class from another class

    I need to dipose one class from another class.
    So that first i have to find what are all threads running in that class and then to kill them
    Assist me.

    Subbu_Srinivasan wrote:
    I am explaining you in clear way
    No you haven't been.
    >
    In my application i am handling many JInternalFrame.Simultaneously i am running working on more than one frame.
    Due to some poor performance of some thread in one JInternalFrame,the thread is keeps on running .
    i could not able to proceed further on that screen.
    So i have to kill that JInternalFrame.Yoinks.
    To be begin with your problem sounds like you are doing everything in one thread. So stop doing that. Second when you get it split up and if a task is taking too much time then interrupt it. No kill. Interrupt. This means the worker thread needs to check sometimes if it has been interrupted.

  • Create an instance of my class variable

    Hello all,
    I'm a newbie to iPhone/iPad programming and am having some trouble, I believe the issue is that I'm not creating an instance of my class variable.  I've got a class that has a setter and a getter, I know about properties but am using setters and getters for the time being.  I've created this class in a View-based application, when I build the program in XCode 3.2.6 everything builds fine.  When I step through the code with the debugger there are no errors but the setters are not storing any values and thus the getters are always returning 0 (it's returning an int value).  I've produced some of the code involved and I was hoping someone could point out to me where my issue is, and if I'm correct about not instantiating my variable, where I should do that.  Thanks so much in advance.
    <p>
    Selection.h
    @interface Selection : NSObject {
      int _choice;
    //Getters
    -(int) Choice;
    //Setters
    -(void) setChoice:(int) input;
    Selection.m
    #import "Selection.h"
    @implementation Selection
    //Getters
    -(int)Choice {
      return _choice;
    //Setter
    -(void)setChoice:(int)input{
              _choice = input;
    RockPaperScissorsViewController.m
    #import "RockPaperScissorsViewController.h"
    @implementation RockPaperScissorsViewController
    @synthesize rockButton, paperButton, scissorsButton, label;
    //@synthesize humanChoice, computerChoice;
    -(void)SetLabel:(NSString *)selection{
              label.text = selection;
    -(IBAction)rockButtonSelected {
    //          [self SetLabel:@"Rock"];
              [humanChoice setChoice:1];
    </p>
    So in the above code it's the [humanChoice setChoice:1] that is not working.  When I step through that portion with the debugger I get no errors but when I call humanChoice.Choice later on in the code I get a zero.
    -NifflerX

    It worked, thank you so much.  I put
    humanChoice = [[Selection alloc]init];
    In viewDidLoad and it worked like a charm.  Thank you again.
    -NifflerX

  • Creating multiple instances of a class in LabVIEW object-oriented programming

    How do you create multiple instances of a class in a loop?  Or am I thinking about this all wrong?
    For instance, I read in a file containing this information:
    Person Name #1
    Person Age #1
    Hobby #1
    Hobby #2
    Hobby #3
    Person Name #2
    Person Age #2
    Hobby #1
    Hobby #2
    Hobby #3
    Person Name #3
    Person Age #3
    Hobby #1
    Hobby #2
    Hobby #3
    If I define a Person class with name, age, and an array of strings (for the hobbies), how can I create several new Person instances in a loop while reading through the text file?
    FYI, new to LabVIEW OOP but familiar with Java OOP.  Thank you!

    First of all, let's get your terminology correct.  You are not creating multiple instances of a class.  You are creating Objects of the class.
    Use autoindexing to create an array of your class type.
    There are only two ways to tell somebody thanks: Kudos and Marked Solutions
    Unofficial Forum Rules and Guidelines

  • How to create an instance of a class which is stored in a String?

    I've class name stored in a String Object.
    now i've to create an instance of that class name.
    How?

    This is very dangerous ground because you give up compile-time safety, but you can get a Class object using Class.forName(String). Then you can use methods of the class Class to operate on it (including creating an instance).

  • Creating an instance of a class with no default constructor

    Hello gurus,
    I wrote my own serialization and RMI protocol for both C++ and Java that follows closely what the default Java version does. I'm trying to recreate an object on the Java side that was sent over the wire. The first step is to create an instance of the class. How do I create an instance of a class that has no constructor (i.e. the only instances are static, created by the class itself and returned by static methods) or one that has no default constructor (like Integer)? The Java serialization seems to support it but the reflection API doesn't seem to have any support for this (i.e. Class::newInstance() and Constructor::newInstance()). It seems that through the standard API you can only create an object via one of its constructors. There must be a "hidden" method somewhere that allows the Java serialization to create an object without calling a constructor - where is it?
    Dominique

    There must be a "hidden" method
    somewhere that allows the Java serialization to create
    an object without calling a constructor - where is
    it?You are correct, the way in which the Serialization creates Objects is "hidden" deep within the runtime.
    If it were not hidden, you would be able to find it, and use it to violate the integrity of the VM.

Maybe you are looking for