problem of abstract class.

Salvation;

kindly confirm that after statement is true or false

All the abstract methods in the abstract superclass must be implemented by the first non-abstract class.

concerning
Pardeep James

You're wrong. Take into account:

abstract class A
{
  abstract void method();
}

abstract class B extends A
{
  void method(){}
}

class C extends B
{
}

Tags: Java

Similar Questions

  • Interface within an abstract class

    Hi all..

    I'm a little frustrated to understand what is this interface within this abstract class.

    Copy the following code is a part of the first question in our future review...

    I'll be happy to hear what you think, and if you guys could give some examples of how I can use it, that would be wonderful.

    public abstract class Expression {
  public abstract String toString();


  public abstract SimpleExpression evaluate();


  public void show() {
  System.out.println(this + " = " + evaluate());
  }


  protected static double toDouble(Object value) {
  return ((Number) value).doubleValue();
  }


  protected static interface Function {
  Object compute(Object... values);
  }
}











    public class SimpleExpression extends Expression {
  private final Object value;


  public SimpleExpression(Object value) {
  this.value = value;
  }


  protected SimpleExpression(Function func, Expression... exprs) {
  Object[] values = new Object[exprs.length];
  for (int i = 0; i < exprs.length; i++)
  values[i] = exprs[i].evaluate().value;
  value = func.compute(values);
  }


  public String toString() {
       return value.toString();
  }


  public SimpleExpression evaluate() {
  return this;
  }
}

    Thank you!!

    I'm a little frustrated to understand what is this interface within this abstract class.

    Not sure what you mean by "does". It defines only an interface.

    Do you mean why it is set inside the other class?

    This is done in order to limit the visibility of the interface. Note that it is marked protected.

    This creates a dependency between the enclosing class and interface so that they are used together.

    One use of (or members) interfaces is for better control of name resolution and prevent name clashes. Interface member names are qualified by the class name of the class that surrounds them.

    This ensures that any reference that see you to this interface is really the interface of the enclosing class and not a generic interface of the same name.

    If you create a class that extends an interface of the pubis, it is often possible for a person to usurp this public interface by creating their own interface and including in the classpath before the real interface.

  • Abstract class polymorphism

    Hello

    I am learning Java and ran through abstract classes and polymorphism. Let's say that

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    RRSOra? wrote:
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  • When to use the interface and what Abstract Class?

    In a recent interview, was asked "when to use interface and what Abstract Class? Explain with an example.


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    D.

  • Why use an abstract class?

    I am new to Java, and for some reason I can't get my head around why use an abstract class. I understand that an abstract class is something like:
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public void eat(){
// stub
}

}

public class Apple extends Food{

public void eat(){
// Eat an apple code
}

}
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    I understand what an abstract class is and how to write a. What I don't understand is why you would use it? It seems to me I might just create a normal class, called 'Food' and just do not instantiated. What are the benefits of using an abstract class?

    807479 wrote:
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    That is why it must be abstract because you can not instantiate the class because not all methods are completely formed?

    Yes pretty close.

    So basically in an example of a mammal, I might have a breath() method entirely defined in the abstract class because all breath of mammals.
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    Right.

    Now I can not instantiate a mammal because it has only a stub for the speak() method so it must be an abstract class.

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  • The abstract class constructor

    Hello

    I can write a constructor for the abstract class, but I can't create the object. So, what's the point of this?

    Please guide me.

    Ankur Raiyani wrote:
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    I can write a constructor for the abstract class, but I can't create the object. So, what's the point of this?

    Abstract class can have instance variables. To initialize the instance variables of the class super (abstract class) of upper class, we use the constructor in the upper class (abstract class).

    Super() can be used here. For example,.

    public abstract class ClassA {
     int a;
     ClassA(int x) {
          a = x;
     }
}

public class ClassB extends ClassA {
     int b;
     ClassB(int x, int y) {
          super(x);
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}

    Published by: Ram on July 29, 2011 16:03

    Published by: Ram on July 29, 2011 16:04

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    at com.rim.tad.tools.qml.core.internal.model.semantic.ModelInfoLoader.assureParseComponent(ModelInfoLoader.java:428)
    at com.rim.tad.tools.qml.core.internal.model.semantic.ModelInfoLoader.parseComponent(ModelInfoLoader.java:335)
    at com.rim.tad.tools.qml.core.internal.model.semantic.ModelInfoLoader.assureParseComponent(ModelInfoLoader.java:428)
    at com.rim.tad.tools.qml.core.internal.model.semantic.ModelInfoLoader.parseComponent(ModelInfoLoader.java:335)
    at com.rim.tad.tools.qml.core.internal.model.semantic.ModelInfoLoader.assureParseComponent(ModelInfoLoader.java:428)
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    at com.rim.tad.tools.qml.core.internal.model.semantic.ModelInfoLoader.createModelInfoFromBuiltInFile(ModelInfoLoader.java:186)
    at com.rim.tad.tools.qml.core.internal.editor.QMLEditor.(QMLEditor.java:53)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:184)
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
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    at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:260)
    at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:235)
    at org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:875)
    at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:609)
    at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
    at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
    at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)
    at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)
    at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
    at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)
    at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1245)
    at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1198)
    at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1597)
    at org.eclipse.ui.internal.PartStack.add(PartStack.java:493)
    at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)
    at org.eclipse.ui.internal.PartStack.add(PartStack.java:479)
    at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)
    at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63)
    at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:225)
    at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:213)
    at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:808)
    at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:707)
    at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:666)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2942)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2850)
    at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2842)
    at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2793)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2789)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2773)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2764)
    at com.rim.tad.tools.qml.project.internal.wizard.QMLNewProjectWizard$2$1.run(QMLNewProjectWizard.java:221)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:173)
    at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:388)
    at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:1029)
    at com.rim.tad.tools.qml.project.internal.wizard.QMLNewProjectWizard.performFinish(QMLNewProjectWizard.java:248)
    at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:827)
    at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:432)
    at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
    at org.eclipse.jface.window.Window.open(Window.java:801)
    at org.eclipse.ui.internal.actions.NewWizardShortcutAction.run(NewWizardShortcutAction.java:135)
    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

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    A few of us have had this problem, the solution for me was to uninstall the kit development software and the remains of previous versions and reinstall.

  • Problem of brewing class

    Hello world

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    "5000: the class 'Shuffle' must subclass 'flash.display.MovieClip' because it is linked to a symbol in the library of this type."

    No idea how can I fix? Here is my code. Thanks for your replies!

    Code shuffle. ACE

    package
    {
    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import the map;
    import the resident;
    Import BlueBoard;
    import RedBoard;
    import of snow;


    public class CardDeck
    {

    private var _card:Card;
    private var _boarder:Boarder;
    private var _blueBoard:BlueBoard;
    private var _redBoard:RedBoard;
    private var _snow:Snow;
    private var content: Array;
    private var RandomNum:Number;
    private var _cards:Array;


    public void CardDeck()
    {
    Content = new Array();
    _cards = new Array();



    }

    public function set Cont (_parmConts)
    {
    This. Content = _parmConts;
    }

    public function get Cont()
    {
    This return. Content;
    }

    public void AddCard (_card): void {}


    Contents.push (_card);


    }
    ////////////////////////
    random start
    ///////////////////////
    public void Shuffle() {}


    var tempArray:Array = new Array();
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    for (var i = 0; i < myCount; i ++) {}
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    var Mytest = content [rand];
    Contents.splice (rand, 1);
    tempArray.push (Mytest);
    }
    for (var j = 0; j < myCount; j ++) {}
    Content [j] = tempArray [j];
    }
    }
    /////////////////////////////////////////
    End shuffle
    /////////////////////////////////////////

    private var CardPicked;
    public void DrawCard() {}


    CardPicked = Contents.shift ();
    RemoveTopCard();
    Return CardPicked;
    }
    public void RemoveTopCard() {}
    Contents.Shift ();


    }
    public void DeckCount() {}


    Return Contents.length;
    }

    public void ShowTopCard()
    {
    Return summary [0];
    }

    public void ShowCards (Num)
    {
    var TempArray:Array = new Array (Num)
    for (var i = 0; i < Num; i ++) {}
    TempArray [i] = content [i];
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    public void RemoveCard (CardName)
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    var RemovedOne = false;


    for (var i = 0; i < myCount; i ++) {}

    trace ("increment:" + i);
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    {
    var Mytest = content [i];
    if(MyTest.CardName == CardName)
    {
    delete this item
    trace ("REMOVE THIS MAP");
    Contents.splice (i, 1);
    RemovedOne = true;
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    }

    }

    }

    }
    }

    Code Card.As

    package
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    import flash.events.MouseEvent;

    Card/public class extends MovieClip
    {
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    {
    This.Play ();
    this.removeEventListener (MouseEvent.CLICK, onClick)
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    {
    var thisMC:MovieClip = event.currentTarget as MovieClip;
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    public void setType(type:*):void
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    }
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    }

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    not

    public class CardDeck

  • Problems by applying classes to my textfield.

    Hi all, good morning. I can't speak good enough how this forum has been so great for me. I learn so MUCH the actionscript. in any case, my problem is now referring to the css. I have a quotes.css already been loaded in the flash, how do I apply a class to a textfield, the code is below, but it works fine now.

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    Thank you.

    var tl:MovieClip =;

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    }

    tl.createTextField ("resultsField", tl.getNextHighestDepth (), xSpace, ySpace * Math.floor (i + um/colnum coln), 200, 30);

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    resultsField.html = true;

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    elegant var = new TextField.StyleSheet ();

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    my_xml. OnLoad = {function (yes:Boolean)}

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    moeda.htmlText = stripF(RootNode.childNodes[0].firstChild.nodeValue);

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    trace (column20._x);

    trace (resultsField.Text);

    trace (stripF(RootNode.childNodes[0].firstChild.nodeValue));

    }

    resultsField.htmlText = Moi (a);

    } else {}

    trace ("buahCol!");

    }

    };

    my_xml.ignoreWhite = true;

    my_xml. Load ("quotes.xml");

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    };

    function minF(a:Array):Number {}

    var min:Number = [0];

    for (var i: Number = 1; i >.) Length; i ++) {}

    If (a [i] < min) {}

    min = a [i];

    } else {}

    trace ("buahMin!");

    }

    }

    return min;

    function stripF(s:String):String {}

    Return s.split("").join("").split("\n").join("").split("\r").join("");

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    you're not assign ownership of style sheet to your textfields.  use:

    kglad wrote:

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    elegant var = new TextField.StyleSheet ();
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    my_xml. OnLoad = {function (yes:Boolean)}
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    RootNode = my_xml.firstChild;
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    "+ stripF (RootNode.childNodes [i].firstChild.nodeValue) +".

    ";
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    moeda.htmlText = stripF(RootNode.childNodes[0].firstChild.nodeValue);
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