Is this constructor overloading??

class A
A(){
System.out.println("A is instantiated");
public void A(){
System.out.println("inside the method A of class A");
class B extends A
B(){
System.out.println("B is instantiated");
public void B(){
System.out.println("inside the method B of class B");
public static void main(String[] args) {
A a = new A();
a.A();
B b = new B();
b.A();
b.B();     
since i hav given same names to constructor and method in class A and also in class B....i hav doubt whether is constructor overloading or not?

Try compiling this code:
class ObjectOne {
    ObjectOne() {}
    ObjectOne(int n) {
        System.out.println(n);
class ObjectTwo extends ObjectOne {
    public static void main(String[] args) {
        ObjectTwo obj = new ObjectTwo(9);
}The very first line of any constructor is a call to super. Even if you do not type it, that line is explicitly inserted by the compiler.
So this:
class Foo extends Bar {
    Foo() {
        System.out.println("Foo");
}becomes
class Foo extends Bar {
    Foo() {
        super();  // explicit call to super
        System.out.println("Foo");
}

Similar Messages

  • Unable to implement Constructor Overloading in an inherited class. Plz Help

    Please do compile the program in in order to notice the error.
    class EmpDet
    int id,age;
    String name;
    String gender;
      EmpDet(int id1,String name1,int age1,String gender1)
        this.id = id1;
        this.name= name1;
        this.age= age1;
        this.gender = gender1;
       void Id_Name()
       System.out.println("EmpId : "+id+" and Name : "+name);
       void Gender_Age()
        System.out.println("Employee is a "+gender+" and is "+age+" years old.");
      class Employee extends EmpDet
           String locality;
        Employee(int a,String b,int c,String d)
             super(a,b,c,d);
        Employee(String locality1)// Constructor overloading. My problem.
             this.locality = locality1;
      void locality()
        System.out.println("The employee resides at "+locality);
       void DiplayStmt()
            System.out.println("DISPLAYING EMPLOYEE DETAILS..");
            System.out.println("******************************");
       public static void main (String[] args)
        Employee det = new Employee(010,"John",32,"M");
        Employee addr = new Employee("Tambaram");
        addr.DiplayStmt();
        det.Id_Name();
        det.Gender_Age();
        addr.locality();
      }

    Hey Thanks.. I guess what you said makes sense.
    I was fiding it hard to agree that there needs to be a match between the Constructors of the Base Class and the Sub Class. I altered the program by adding a constructor in the Base class and using the super(0 function in the Sub class and that seems to work..
    class EmpDet
    int id,age;
    String name;
    String gender;
    EmpDet(int id1,String name1,int age1,String gender1)
         this.id = id1;
    this.name= name1;
    this.age= age1;
    this.gender = gender1;
    EmpDet(String addr)
         System.out.println("Address is implemented in SubClass");
    void Id_Name()
    System.out.println("EmpId : "+id+" and Name : "+name);
    void Gender_Age()
    System.out.println("Employee is a "+gender+" and is "+age+" years old.");
    class Employee extends EmpDet
         String locality;
    Employee(int a,String b,int c,String d)
         super(a,b,c,d);
    Employee(String locality1) // Constructor Overloading
         super(locality1);
         this.locality = locality1;
    void locality()
    System.out.println("The employee resides at "+locality);
    void DiplayStmt()
         System.out.println("DISPLAYING EMPLOYEE DETAILS..");
         System.out.println("******************************");
    public static void main (String[] args)
    Employee det = new Employee(010,"John",32,"M");
    Employee addr = new Employee("Tambaram");
    addr.DiplayStmt();
    det.Id_Name();
    det.Gender_Age();
    addr.locality();
    Message was edited by:
    3402102

  • Constructor Overloading

    I am making a program that takes in some information from the user. As an example, the program takes in home phone number and mobile phone number.
    I'd like to give the user the option of just not entering in one of those. I could do this with overloading the constructor. Would this be the best way to do this?
    It seems to get messy since I have a lot of options that the user could leave out and then obviously need a constructor for each. I would have about four constructors. Is this bad practice? If so, what would be the best way to do this?

    Since phone numbers are Strings, you could just use one constructor and pass empty strings if necessary,.

  • Help with constuctor, need to rewrite program with this constructor

    i need to use this constructor for my Scholar class:
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    http://www.cs.utsa.edu/~javalab/cs17.../project1.html
    here's my code for the Scholar class:package project1;
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        private static Random rand;
        private String fullName;
        private double gradePointAverage;
        private int essayScore;
        private int creditHours;
        private boolean scienceMajor;
        private String lastName;
        private String firstName;
        private double totalScore;
        /** Creates a new instance of Scholar */
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                return gradePointAverage;
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                return creditHours;
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            public int setCreditHours(int a){
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                return creditHours;
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                    totalScore += .5;
                else if (creditHours >= 90)
                    totalScore += .75;
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            public int compareTo(Object obj){
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                double result = getScore() - otherObj.getScore();
                if (result > 0)
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                else if (s2.getScore() > s1.getScore() && s2.getScore() > s3.getScore())
                    System.out.println(s2.getFullName() + " scored the highest" +
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    kevin.setFullName("Brown", "Kevin J");
    kevin.setScienceMajor(true);
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    else
        System.out.println(abraham.getFullName() + " scored higher than " +
                abraham.getFullName() + ".\n");
    System.out.println("--------Part 4--------\n");
        Scholar.max(abraham, george);
        Scholar thomas = new Scholar("Jefferson", "Thomas");
        thomas.scholarship();
            System.out.println("New student added - " + thomas + "\n");
            System.out.println(abraham.getFullName() + " scored " +
                    abraham.getScore() + ".");
            System.out.println(george.getFullName() + " scored " +
                    george.getScore() + ".");
            System.out.println(thomas.getFullName() + " scored " +
                    thomas.getScore() + ".\n");
        Scholar.max(abraham, george, thomas);
    }everything runs like it should and the program is doing fine, i just need to change the format of the Scholar constructor and probably other things. Can someone please give me an idea how to fix this.
    Thanks for taking your time reading this.

    then don't reply if you're not going to read it, i
    just gave the url, Don't get snitty. I'm just informing you that most people here don't want to click a link and read your whole bloody assignment. If you want help, the burden is on you to make it as easy as possible for people to help you. I was only trying to inform you about what's more likely to get you help. If doing things your way is more important to you than increasing your chances of being helped, that's your prerogative.
    so you can get an idea on what
    it's about, and yeah i know how to add a constructor,
    that's very obvious, That's what I thought, but you seemed to be saying, "How do I add this c'tor?" That's why I was asking for clarification about what specific trouble you're having.
    i just want to know how to
    implement everything correctly, so don't start
    flaming people. I wasn't flaming you in the least. I was informing you of how to improve your chances of getting helped, and asking for clarification about what you're having trouble with.

  • Java constructor overload error

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    }//end actionPerformed()
    }//end class newMenuHandler
    class openMenuHandler implements ActionListener
    JFileChooser jfc;
    Container parent;
    int choice;
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    super();
    jfc = new JFileChooser();
    jfc.setSize( 400,300 );
    jfc.setFileFilter( new XmlFileFilter() );
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    }//end openMenuHandler()
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    // Displays the jfc and sets the dialog to 'open'
    choice = jfc.showOpenDialog( parent );
    if ( choice == JFileChooser.APPROVE_OPTION )
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    BufferedReader reader;
    fileName = jfc.getSelectedFile().getAbsolutePath();
    try
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    while ( ( line = reader.readLine() ) != null )
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    } //end while ( ( line = reader.readLine() ) != null )
    // The file will have to be re-read when the Document
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    String message = ex.getMessage();
    ex.printStackTrace();
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    jfc.setCurrentDirectory( new File( fileName ) );
    } //end if ( choice == JFileChooser.APPROVE_OPTION )
    }//end actionPerformed()
    }//end class openMenuHandler
    class saveMenuHandler implements ActionListener
    JFileChooser jfc;
    Container parent;
    int choice;
    saveMenuHandler()
    super();
    jfc = new JFileChooser();
    jfc.setSize( 400,300 );
    jfc.setFileFilter( new XmlFileFilter() );
    parent = saveItem.getParent();
    }//end saveMenuHandler()
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    // Displays the jfc and sets the dialog to 'save'
    choice = jfc.showSaveDialog( parent );
    if ( choice == JFileChooser.APPROVE_OPTION )
    String fileName;
    File fObj;
    FileWriter writer;
    fileName = jfc.getSelectedFile().getAbsolutePath();
    try
    writer = new FileWriter( fileName );
    textArea.write( writer );
    // The file will have to be re-read when the Document
    object is parsed
    writer.close();
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    ioe.printStackTrace();
    }//end try/catch
    jfc.setCurrentDirectory( new File( fileName ) );
    } //end if ( choice == JFileChooser.APPROVE_OPTION )
    }//end actionPerformed()
    }//end class saveMenuHandler
    class exitMenuHandler implements ActionListener
    public void actionPerformed( ActionEvent ae )
    verifyDialog.show();
    }//end actionPerformed()
    }//end class exitMenuHandler
    class XmlFileFilter extends javax.swing.filechooser.FileFilter
    public boolean accept( File fobj )
    if ( fobj.isDirectory() )
    return true;
    else
    return fobj.getName().endsWith( ".xml" );
    }//end accept()
    public String getDescription()
    return "*.xml";
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    }//end class XmlFileFilter
    } //end class Editor
    Sorry if this post has been a bit lengthy, any help you guys could give
    me solving this would be really appreciated.
    Thanks,
    Iain.

    Hey. Couple pointers:
    When posting, try to keep code inbetween code tags (button between spell check and quote original). It will pretty-print the code.
    Posting code is good. Usually, though, you want to post theminimum amount of code which runs and shows your problem.
    That way people don't have to wade through irrelevant stuff and
    they have an easier time helping.
    http://homepage1.nifty.com/algafield/sscce.html
    As for your problem, this is a scope issue. You declare an
    ArrayList xmlText in main(). That means that everywhere after
    the declaration in main(), you can reference your xmlText.
    So far so good. Then, inside main(), you call
    Editor = new Editor( "Editor 1.0", xmlText );Now you've passed the xmlText variable to a new method,
    Editor(String title, ArrayList xmlText) [which happens to be a
    constructor, but that's not important]. When you do that, you
    make the two variables title and xmlText available to the whole
    Editor(String, ArrayList) method.
    This is where you get messed up. You invoke another method
    from inside Editor(String, ArrayList). When you call
    this(title);you're invoking the method Editor(String title). You aren't passing
    in your arraylist, though. You've got code in the Editor(String) method
    which is trying to reference xmlText, but you'd need to pass in
    your ArrayList in order to do so.
    My suggestion would be to merge the two constructor methods into
    one, Editor(String title, ArrayList xmlText).

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    Hi,
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    Here is an example:
    *& Report  ZCL_OVR                                                     *
    REPORT  zcl_ovr                                                     .
    *       CLASS lcl_a DEFINITION
    CLASS lcl_a DEFINITION.
      PUBLIC SECTION.
        METHODS:
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          do_sth IMPORTING iv_a TYPE i
                 RETURNING value(ov_b) TYPE i.
    ENDCLASS.                    "lcl_a DEFINITION
    *       CLASS lcl_a IMPLEMENTATION
    CLASS lcl_a IMPLEMENTATION.
      METHOD constructor.
      ENDMETHOD.                    "constructor
      METHOD do_sth.
        ov_b = 2 * iv_a.
      ENDMETHOD.                    "do_sth
    ENDCLASS.                    "lcl_a IMPLEMENTATION
    *       CLASS lcl_b DEFINITION
    CLASS lcl_b  DEFINITION INHERITING FROM lcl_a.
      PUBLIC SECTION.
        METHODS:
          constructor IMPORTING iv_a TYPE i,
          do_sth REDEFINITION.
      PRIVATE SECTION.
        DATA lv_c TYPE i.
    ENDCLASS.                    "lcl_b DEFINITION
    *       CLASS lcl_b IMPLEMENTATION
    CLASS lcl_b IMPLEMENTATION.
      METHOD constructor.
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    in my app i want to create an object of Immobile class:
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    I think that my design is ok.Two competent developers and me disagree with you.Sign me in here. Every time I get code with methods with more than 4 parameters I shudder.
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    I think that made a class User whit parameter Name,
    Surname, address, telefon, fax is ok
    and i think that a user probably haven't a fax.
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    variables? What are you doing, show a small piece of
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    class Adress for City, street, country, etc.
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    Does this code:
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         public BadAttributeExceptionClass()
              super("An exception has occured while trying to set an attribute value.");
         public BadAttributeExceptionClass(String message)
              super(message);
         public BadAttributeExceptionClass(String badAttribute,int value)
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         public BadAttributeExceptionClass(String badAttribute,String value)
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    satisfy this requirement:
    BadAttributeValueException Class
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    Default Constructor
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    Overloaded Two Argument Constructors
    You will create the following 2-argument constructors:
    Arg 1     Arg 2      Description
    String     int     Used when integer attributes are attempting to be initialized
    String     double     Used when double attributes are attempting to be initialized
    String     String     Used when string attributes are attempting to be initialized
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    ?     The name of the attribute
    ?     The value that was incorrect.
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    Could be wrong but it sounds like you need the message plus both the attribute and value for the last three constructors. If so:
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        private static final String MESSAGE = "An exception has occured while trying to set an attribute value. The user has tried to enter an invalid value for the attribute ";
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              super(MESSAGE);
         public BadAttributeExceptionClass(String message)
              super(message);
        public BadAttributeExceptionClass(String badAttribute,int value)
              this(badAttribute, value);
         public BadAttributeExceptionClass(String badAttribute,double value)
              this(badAttribute, value);
         public BadAttributeExceptionClass(String badAttribute,String value)
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    }Message was edited by:
    abillconsl

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    import java.awt.Color;
    import java.awt.Font;
    import java.awt.FlowLayout;
    import java.awt.Dimension;
    import java.awt.GridBagLayout;
    import java.awt.GridBagConstraints;
    import java.awt.Insets;
    import java.awt.event.ActionListener;
    import java.awt.event.ActionEvent;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JColorChooser;
    import javax.swing.ButtonGroup;
    import javax.swing.Box;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.BoxLayout;
    import javax.swing.JTextArea;
    import javax.swing.JTextField;
    import javax.swing.JLabel;
    import javax.swing.JComboBox;
    import javax.swing.JOptionPane;
    import javax.swing.JRadioButton;
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    import java.net.*;
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              gbconstraints.gridy = 0;
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              gbconstraints.gridwidth = 1;
              gbconstraints.weightx = 5;
              gbconstraints.weighty = 1;
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              gbconstraints.gridy = 0;
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              gbconstraints.gridwidth = 1;
              gbconstraints.weightx = 1;
              gbconstraints.weighty = 1;
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              gbconstraints.gridy = 1;
              gbconstraints.gridheight = 4;
              gbconstraints.gridwidth = 11;
              gbconstraints.weightx = 10;
              gbconstraints.weighty = 20;
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              gbconstraints.fill = GridBagConstraints.BOTH;
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              gbconstraints.gridy = 5;
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              gbconstraints.gridwidth = 1;
              gbconstraints.weightx = 5;
              gbconstraints.weighty = 1.5;
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              gbconstraints.fill = GridBagConstraints.HORIZONTAL;
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              gbconstraints.gridy = 6;
              gbconstraints.gridheight = 1;
              gbconstraints.gridwidth = 1;
              gbconstraints.weightx = 1;
              gbconstraints.weighty = 1;
              gbconstraints.anchor = GridBagConstraints.WEST;
              gbconstraints.fill = GridBagConstraints.HORIZONTAL;
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              gbconstraints.gridy = 7;
              gbconstraints.gridheight = 1;
              gbconstraints.gridwidth = 1;
              gbconstraints.weightx = 1;
              gbconstraints.weighty = 1;
              gbconstraints.anchor = GridBagConstraints.WEST;
              gbconstraints.fill = GridBagConstraints.BOTH;
              gbconstraints.insets = new Insets(0, 10, 0, 0);
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              gbconstraints = new GridBagConstraints();
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              gbconstraints.gridy = 8;
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              gbconstraints.gridwidth = 10;
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              gbconstraints.weighty = 1;
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              gbconstraints.gridy = 8;
              gbconstraints.gridheight = 1;
              gbconstraints.gridwidth = 1;
              gbconstraints.weightx = 1;
              gbconstraints.weighty = 1;
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              gbconstraints.gridy = 10;
              gbconstraints.gridheight = 3;
              gbconstraints.gridwidth = 4;
              gbconstraints.weightx = 5;
              gbconstraints.weighty = 0;
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              gbconstraints.insets = new Insets(0, 10, 0, 0);
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              gbconstraints = new GridBagConstraints();
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              gbconstraints.gridy = 10;
              gbconstraints.gridheight = 3;
              gbconstraints.gridwidth = 4;
              gbconstraints.weightx = 5;
              gbconstraints.weighty = 0;
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              lpanel1 = new JPanel();
              lpanel2 = new JPanel();
              lpanel3 = new JPanel();
              lpanel4 = new JPanel();
              lpanel5 = new JPanel();
              lpanel.add(lpanel1);
              lpanel.add(lpanel2);
              lpanel.add(lpanel3);
              lpanel.add(lpanel4);
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              lpanel2.setLayout(new FlowLayout(FlowLayout.LEFT));
              lpanel3.setLayout(new FlowLayout(FlowLayout.LEFT));
              lpanel4.setLayout(new FlowLayout(FlowLayout.LEFT));
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              portnum = new JLabel("Port Number:");
              lpanel4.add(portnum);
              lpanel4.add(Box.createRigidArea(new Dimension(5, 0)));
              portnumfd = new JTextField("2250", 10);
              lpanel4.add(portnumfd);
              //create & add the connect butt
              connect = new JButton("Connect");
              lpanel5.add(connect);
              dropconnection = new JButton("Disconnect");
              lpanel5.add(dropconnection);
              connect.addActionListener(this);
              dropconnection.addActionListener(this);
              //start the creation of the right hand panel.
              rpanel.setLayout(new BoxLayout(rpanel, BoxLayout.Y_AXIS));
              //create the panels again
              rpanel1 = new JPanel();
              rpanel2 = new JPanel();
              rpanel3 = new JPanel();
              rpanel4 = new JPanel();
              rpanel5 = new JPanel();
              rpanel.add(rpanel1);
              rpanel.add(rpanel2);
              rpanel.add(rpanel3);
              rpanel.add(rpanel4);
              rpanel.add(rpanel5);
              rpanel1.setLayout(new FlowLayout(FlowLayout.LEFT));
              rpanel2.setLayout(new FlowLayout(FlowLayout.LEFT));
              rpanel3.setLayout(new FlowLayout(FlowLayout.LEFT));
              rpanel4.setLayout(new FlowLayout(FlowLayout.LEFT));
              rpanel5.setLayout(new FlowLayout(FlowLayout.LEFT));
         //now start putting things into them again
              //add in the font settings
              String[] fonty = {"Normal", "Bold", "Italic"};
              fonts = new JLabel("Set your text style:");
              fontcombiBox = new JComboBox(fonty);
              rpanel2.add(fonts);
              rpanel2.add(Box.createRigidArea(new Dimension(4,0)));
              rpanel2.add(fontcombiBox);
              //default text will be plain..
              fontcombiBox.setSelectedIndex(0);
              String[] userstatus = {"Online", "Away", "Be Right Back", "Busy", "Out To Lunch", "On The Phone"};
              ustatus = new JLabel("Select a status:");
              statusbox = new JComboBox(userstatus);
              rpanel2.add(ustatus);
              rpanel2.add(Box.createRigidArea(new Dimension(2,0)));
              rpanel2.add(statusbox);
              //add in some emotion to the conversations
              String[] emotion = {"Angry", "Happy", "Sad", "Crying", "Shocked", "Laughing", "Laughing My Ass Off!"};
              econs = new JLabel("Select an emoticon:");
              emoticons = new JComboBox(emotion);
              rpanel3.add(econs);
              rpanel3.add(Box.createRigidArea(new Dimension(3,0)));
              rpanel3.add(emoticons);
              //self comm options
              talk2urself = new JLabel("Set Self Communication Mode:");
              rpanel4.add(talk2urself);
              talk2urselfOn = new JRadioButton("On", true);
              rpanel4.add(talk2urselfOn);
              rpanel4.add(Box.createRigidArea(new Dimension(4, 0)));
              talk2urselfOff = new JRadioButton("Off", false);
              rpanel4.add(talk2urselfOff);
              //create a group that will hold both these buttons together
              ButtonGroup groupy = new ButtonGroup();
              //add them to the group
              groupy.add(talk2urselfOn);
              groupy.add(talk2urselfOff);
              //create and add the change backgrd button
              colourButton = new JButton("Alter Background");
              rpanel5.add(colourButton);
              //add in some listeners
              talk2urselfOn.addActionListener(this);
              talk2urselfOff.addActionListener(this);
              fontcombiBox.addActionListener(this);
              colourButton.addActionListener(this);
              statusbox.addActionListener(this);
              //add in the 'X' button in the top right corner of app
              setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              //put all elements together
              this.pack();
              //show the GUI for the user..
              this.show();
          * Creates a new client and GUI as its the main method
         public static void main(String args[])
              new Client();
          * This method listens for actions selected by the user and then performs the
          * necessary tasks in order for the correct events to take place...!
          * This method was mainly created thanks to the Developing Java GUI book which has already
          * been mentioned as it covers listeners and event handling...
         public void actionPerformed(ActionEvent event)
              //if the send button is clicked or if hard carriage return after message
              if((event.getSource() == (sendMsgButton)) || (event.getSource().equals(createMsg)))
                   //if theres no text dont send message
                   if(createMsg.getText().equals(""))
                        JOptionPane.showMessageDialog(this, "There's no text to send!");
                   else
                        String str  = createMsg.getText();
                        printMessage(str);
              //if the exit button is clicked
              if(event.getSource() == (exitButton))
                   //quit the chat app
                   JOptionPane.showMessageDialog(this, "Thanks For Using Elliot's Chat Network! \nSee You Again Soon!");
                   System.exit(0);
              //if the self comm option is turned on
              if(event.getSource() == (talk2urselfOn))
                   talktoself = true;
                   JOptionPane.showMessageDialog(this, "You have begun self communication \nmessages you send are now displayed");
              //if the self comm option is turned off
              if(event.getSource() == (talk2urselfOff))
                   talktoself = false;
                   JOptionPane.showMessageDialog(this, "You have stopped self communication \nmessages you send are no longer displayed");
              //for the normal font option
              if(fontcombiBox.getSelectedItem().equals("Plain"))
                   //makes a new font style plain...
                   conversationDisplay.setFont(new Font("simple", Font.PLAIN, 12));
                   createMsg.setFont(new Font("simple", Font.PLAIN, 12));
              //for the bold font option
              if(fontcombiBox.getSelectedItem().equals("Bold"))
                   conversationDisplay.setFont(new Font("simple", Font.BOLD, 12));
                   createMsg.setFont(new Font("simple", Font.BOLD, 12));
              //for the italic font option
              if(fontcombiBox.getSelectedItem().equals("Italic"))
                   conversationDisplay.setFont(new Font("simple", Font.ITALIC, 12));
                   createMsg.setFont(new Font("simple", Font.ITALIC, 12));
               *      //the status events if they didnt create null points...
              if(statusbox.getSelectedItem().equals("Online"))
                   String status = "<Online>";
                   printMessage(status);
              if(statusbox.getSelectedItem().equals("Away"))
                   String status = "<Away>";
                   printMessage(status);
              if(statusbox.getSelectedItem().equals("Be Right Back"))
                   String status = "<Be Right Back>";
                   printMessage(status);
              if(statusbox.getSelectedItem().equals("Busy"))
                   String status = "<Busy>";
                   printMessage(status);
              if(statusbox.getSelectedItem().equals("Out To Lunch"))
                   String status = "<Out To Lunch>";
                   printMessage(status);
              if(statusbox.getSelectedItem().equals("On The Phone"))
                   String status = "<On The Phone>";
                   printMessage(status);
              //the emoticons events...
              if(emoticons.getSelectedItem().equals("Angry"))
                   String status = "<Angry>";
                   printMessage(status);
              if(emoticons.getSelectedItem().equals("Sad"))
                   String status = "<Sad>";
                   printMessage(status);
              if(emoticons.getSelectedItem().equals("Shocked"))
                   String status = "<Shocked>";
                   printMessage(status);
              if(emoticons.getSelectedItem().equals("Happy"))
                   String status = "<Happy>";
                   printMessage(status);
              if(emoticons.getSelectedItem().equals("Crying"))
                   String status = "<Crying>";
                   printMessage(status);
              if(emoticons.getSelectedItem().equals("Laughing"))
                   String status = "<Laughing>";
                   printMessage(status);
              if(emoticons.getSelectedItem().equals("Laughing My Ass Off!"))
                   String status = "<Laughing My Ass Off!>";
                   printMessage(status);
              //if the colour button is clicked
              if(event.getSource() == colourButton)
                   //create a new colour chooser
                   colourchoo = new JColorChooser();
                   //create the dialog its shown in
                   JColorChooser.createDialog(colourButton, "Choose your background colour", true, colourchoo, this, this);
                   //now show the dialog
                   Color col = JColorChooser.showDialog(sendMsgButton, "Choose your background colour", Color.GRAY);
                   //when a colour is chosen it becomes the bg colour
                   theWholeApp.setBackground(col);
                   rpanel1.setBackground(col);
                   rpanel2.setBackground(col);
                   rpanel3.setBackground(col);
                   rpanel4.setBackground(col);
                   rpanel5.setBackground(col);
                   lpanel1.setBackground(col);
                   lpanel2.setBackground(col);
                   lpanel3.setBackground(col);
                   lpanel4.setBackground(col);
                   lpanel5.setBackground(col);
              //if the connect button is clicked
              if(event.getSource() == (connect))
                   //get the txt entered into ip addy field & port num fields with a text check...
                   if(hosty.getText().equals("") || portnumfd.getText().equals("") || nickName.getText().equals(""))
                        JOptionPane.showMessageDialog(this, "You cant connect! \nThis is because the either the \n0 - HostName\n 0 - Port Number \n0 - Your Nick \nIs Missing...");
                   else
                        //get details and connect
                        username = nickName.getText();
                        String ipay = hostfield.getText();
                        String porty = portnumfd.getText();
                        connectto(ipay,porty);
          * This method is similar to an append method in that it allows msgs recieved by the server to
          * be displayed in the conversation window. It also deals with the self comm mode as if its disabled
          * then no messages from the sender will be displayed.
         public void moveTextToConvo(String texty)
              //check
              if(ignoreyourself == true)
                   ignoreyourself = false;
              else
                   //If self comm is on the send message as normal
                   if(talktoself)
                        conversationDisplay.setText(conversationDisplay.getText() + texty);
                   else
                        //check message isnt sent by the current client - if it is ignore it!
                        if(texty.startsWith(nickName.getText()))
                             ignoreyourself = true;
                        else
                             conversationDisplay.setText(conversationDisplay.getText() + texty);
              //allows the scroll pane to move automatically with the conversation
              conversationDisplay.setCaretPosition(conversationDisplay.getText().length());
          * This method (connectto) is called if the button's clicked and also sets up a relation
          * between the client and clienttoserver class
         public void connectto(String ipa,String portNO)
              //portNO needs to be changed from string to int
              int portNum = new Integer(portNO).intValue();
              try
                   //creates a socket
                   socky = new Socket(ipa, portNum);
                   writer = new PrintWriter(socky.getOutputStream(), true);
                   ClienttoServer cts = new ClienttoServer(socky, this);
                   cts.runit();
                   //give user a prompt
                   JOptionPane.showMessageDialog(this, "You're now connected!");
              catch(UnknownHostException e)
                   System.err.println("Unknown host...");
                   //prompt the user
                   JOptionPane.showMessageDialog(this, "Failed to connect! \nPlease try again...");
              catch(IOException e)
                   System.err.println("Could Not Connect!");
                   //prompt user
                   JOptionPane.showMessageDialog(this, "Error! \nCould not connect - please try again!");
          * This method sends msgs from current client to server, sends username and then the message.
          * This is split into two different messages as the "\n" is used.
         public void printMessage(String mess)
              writer.println(usernamey.getText() + " says: \n" + mess);
              //then clear the text in the message creation area...
              createMsg.setText("");
          * Accessor method to retrieve userName
         public String getUName()
              return username;
          * Disconnect this user from the server so that they can no longer recieve/send messages
         public void dropconnection()
              try
                   //Start to close everything - informing user
                   writer.close();
                   socky.close();
                   //Give the user info on whats happening
                   JOptionPane.showMessageDialog(this, "You are now disconnected \nYou will no longer be able to \nsend and recieve messages");
                   System.out.println("A user has left the conversation...");
              catch (IOException e)
                   System.err.println("IOException " + e);
    The Server Class:
    import java.net.*;
    import java.io.*;
    * This class works in sync with the ServertoClient class in order to read
    * messages from clients and then send back out to all the active clients. Due to
    * the usage of threading multiple clients can use this server.
    * Once again some of this code is from Florians 2005 tutorial work.
    public class Server
         private ServerSocket server;
         private ServertoClient threads[];
         private static int portNo  = 2250;
         private static String Host = ""; //find method to retrieve ip
         private int maxPeeps = 20; //20 people can talk together but this can be altered
          * 1st Constructor - has no params
         public Server()
          * 2nd Constructor - allows for port number setting
         public Server(int portnumber)
              portNo = portnumber;
          * 3rd Constructor - allows for port number & max users
         public Server(int portnumber, int maxiusers)
              portNo = portnumber;
              maxPeeps = maxiusers;
          * This method is to constantly listen for possible messages from clients
         public void listener()
              //set the time out of method to just under a minute
              final int waitingTime = 500000000;
              //a boolean variable to keep it waiting
              boolean keepWait = true;
              //create a threads array of length maxpeeps
              threads = new ServertoClient[maxPeeps];
              //define a variable that will be used as a count of the no of threads
              int x = 0;
              try
                   //open a new socket on this port number
                   server = new ServerSocket(portNo);
              catch (IOException e)
                   System.err.println("IOException " + e);
                   return;
              //while the keepWait is true and the no. of threads is less than the max...
              while(keepWait && x < maxPeeps)
                   try
                        //set the timeout, this is the waitingTime (50 secs)
                        server.setSoTimeout(waitingTime);
                        //listen for connection to accept
                        Socket socky = server.accept();
                        System.out.println("A New User Has Connected");
                        //creates a new thread and adds it to array
                        threads[x] = new ServertoClient(this, socky);
                        //the thread begins
                        threads[x].start();
                   catch (InterruptedIOException e)
                        System.err.println("The Connection Timed Out...");
                        keepWait = false;
                   catch (IOException e)
                        System.err.println("IOException " + e);
                   x++; //increment no. of threads
              //if waitingTime is reached or there are too many threads then server closes
              try
                   server.close();
              catch(IOException e)
                   System.err.println("IOException " + e);
                   return;
          * This prints the string to all active threads
         public void printAll(String printy)
              for(int x = 0; x < threads.length; x++)
                   if(threads[x] !=null && threads[x].isAlive())
                        threads[x].sendMsg(printy);
          * Main method for the server, creates a new server and then continues to listen
          * for messages from different users
         public static void main(String[] args)
              Server chatsession = new Server();
              System.out.println("The Server Is Now Running on port NO: " + portNo);
              System.out.println("And IP Address: " + Host);
              chatsession.listener();
    [/code
    The ServertoClient Classimport java.lang.Thread;
    import java.net.*;
    import java.io.*;
    * This is the ClienttoServer class that acts as an intermediary between the server
    public class ClienttoServer extends Thread
         private Socket socky;
         private BufferedReader bready;
         private boolean active;
         private Client client;
         * This is the constructor to create a new client service
         public ClienttoServer(Socket socket, Client cli)
              socky = socket;
              active = false;
              client = cli;
              //try to read from the client
              try
                   bready = new BufferedReader(new InputStreamReader(socky.getInputStream()));
              catch (IOException e)
                   System.err.println("IOException " + e);
         * This method reads in from the client
         public void runit()
              active = true;
              while(active == true)
              {//continue to read in and then change the text in the conversation window
                   try
                        String message = bready.readLine();
                        client.moveTextToConvo(message + "\n");
                   catch (IOException e)
                        System.err.println("IOException " + e);
                        active = false;
    And finaly the servertoclient class
    import java.net.*;
    import java.io.*;
    import java.lang.Thread;
    * This clas provides the services that the server uses
    public class ServertoClient extends Thread
         private Socket socky;
         private Server server;
         private BufferedReader bready;
         private PrintWriter writer;
          * This constructor sets up the socket
         public ServertoClient(Server theServer, Socket theSocket)throws IOException
              socky = theSocket;
              server = theServer;
              //sets up the i/o streams
              writer = new PrintWriter(socky.getOutputStream(), true);
              bready = new BufferedReader(new InputStreamReader(socky.getInputStream()));
          * This method keeps listening until user disconnects
         public void run()
              boolean keepRunning = true;
              try
                   //keep listening 'til user disconnects
                   while(keepRunning = true)
                        final String tempmsg = bready.readLine();
                        //is there a message (if yes then print it!)
                        if(tempmsg == null)
                        else
                             server.printAll(tempmsg);
                   dropconnection();
              catch (IOException e)
                   System.err.println("IOException in thread " + Thread.currentThread() + ": " + e);
          * This method is for when a user disconnects from the server...
         public void dropconnection()
              try
                   bready.close();
                   writer.close();
                   socky.close();
              catch (IOException e)
                   System.err.println("IOException in thread " + Thread.currentThread() + ": " + e);
              System.out.println("A User Has Disconnected...");
          * This method prints the message
         public void sendMsg(String msg)
              writer.println(msg);
    }Thats it any help would be much appreciated
    Cheers.

    Like the previous poster indicated: try to find a minimal example that shows the error your experiencing.
    One thing that seems bogus is the Server.listener() method. For one thing, it can increment x even if no new connection has been established (e.g., x will be incremented if an exception is caught).

  • System Overload & How to get the best G4 Performance

    Okay all you Logic and OSX Gurus. I need your help. I've finally made the LOGIC leap from OS9 and have hit the SYSTEM OVERLOAD wall like many of you before me.
    I've been pouring over this, and many other Forums and Blogs, for about two weeks now, and have tried many of the fixes / solutions to no avail. I estimate I'm now getting about 25% of my OS9 Logic performance from Logic in OSX.
    One specific case in point is this. A four minute song sketch. No tempo changes. Four midi tracks, 6 Audio instruments and 2 EFX (1 Guitar Amp Pro, 1 Space Designer that's no even being used).
    I have unsuccessfully tried to Bounce this to disc for two weeks now. The AUDIO and DISK I/O Meters barely register until the GUITAR AMP PRO track brings the AUDIO METER up to about 1/3rd usage. At various points in the Bounce the G4 will completely FREEZE, and I will have manually restart.
    THINGS I HAVE TRIED, and continue to try are:
    - Repairing Permissions
    - Trashing Preferences
    - Updating MOTU Drivers
    - Changing Processor performance setting - which I cannot do BTW, because my system does not seem to support this option.
    - Closing all Widgets
    - Freeing up more Space on my Mac OSx startup disk (I now have 78.41 Gig available on a 114.49 Gig drive)
    - Run Cocktail to clean up System logs and temporary files
    - FREEZING TRACKS as a temporary 'fix'. This did nothing BTW but add more strain to the CPU and I still had about 1/3rd the usage with my GUITAR AMP Plugin (and it still crashed).
    - Increased AUDIO BUFFER to 1024
    So, (and I guess this is really two sides of the same question)...
    1) How do I FIX this SYSTEM OVERLOAD problem, and
    2) How do I "optimize" my Dual 1.25 G4 in order to get the best performance possible out of LOGIC PRO?
    OTHER QUESTIONS I HAVE ARE:
    - Does the G4 have the processing power needed to run LOGIC PRO?
    - I'm confident adding RAM will "help" (can't hurt), but am I really dealing with a RAM Problem here or, again, can these processors really handle it?
    BTW - I'm not looking for an excuse to go shopping for a Quad G5 (I mean who needs an excuse... . But, I'm really trying to determine if at the end of the day I will spend money on RAM, Hard Drives, whatever..., and then still be frustrated and end up shopping.
    - Are SCSI drives a problem with Tiger / Logic? These Cheetah drives are fast (10,000 RPM), reliable, and have been great drives to record on. I'm trying to do this simple bounce to one of the Cheetahs and as I said it's just not happening.
    - Does the startup volume size effect performance?
    - Does the amount of free space on the start up drive effect performance?
    - Firewire 400 vs 800? My sample library is on the Firewire drive, and I'm thinking this does not pull a lot on the CPU as these get loaded into memory before playing? Am I right about that? It is Firewire 400.
    A long letter and a lot of questions. I thank you all in advance for any answers, guidance or direction you can give. Please also let me know if there is something I HAVEN'T asked, looked at or should be doing.
    Best,
    Kevin
    Kevin Saunders Hayes
    SYSTEM SPECS
    Machine Name: Power Mac G4
    Machine Model: PowerMac3,6
    CPU Type: PowerPC G4 (3.3)
    Number Of CPUs: 2
    CPU Speed: 1.25 GHz
    L2 Cache (per CPU): 256 KB
    L3 Cache (per CPU): 2 MB
    Memory: 1 GB
    Bus Speed: 167 MHz
    Boot ROM Version: 4.4.8f2
    Logic 7.1.1 (885)
    Pro Application Support 3.1
    MOTU 896 - Latest drivers
    2 - Seagate Cheetah 9 gig SCSI drives
    1 - Oxford Firewire (Up to 400 Mb/sec) with EXS Library
    G4 Duel 1.25   Mac OS X (10.4.3)  

    And after months of using Express, and a week of
    using Logic, I hadn't had a system overload until
    today. Now I'm having them all the time. It wasn't a
    set up change, it wasn't running on the battery, it
    wasn't running software monitoring, it's set up with
    512 i/o buffer, medium processor buffer. And it
    wasn't brought on by number of tracks - that's for
    sure. After it started happenind and I took a break &
    came back, I was sitting on my couch, Powerbook in
    my lap, tapping a beat in with the onscreen
    keyboard.... a SINGLE instrument, mind you. NO plugs,
    no other tracks of ANY kind. And it happened.
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  • Java constructor

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         private double imag;
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              imag=imaginary;
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           imag= ;
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    Now my constructor is ok but How can I count different
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          re=4;
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              ComplexNumber  newComplex1 = new ComplexNumber();
              ComplexNumber  newComplex2 = new ComplexNumber();
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              newComplex1.re = newComplex2.getReal()+newComplex3.getReal();
              newComplex1.imag= newComplex2.getImaginary( )+newComplex3.getImaginary( );
              return  newComplex1;      
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    System.out.println(" Complex nbr1 + nbr2:   "+myCom);

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    budabud

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