Checked and unchecked Exceptions

I'm novice(new to java) could anyone please explain it in best way.
Thanks in advance

http://java.sun.com/docs/books/tutorial/essential/exceptions/index.html
If you're new to Java, start with reading the tutorials (or a Java book):
http://java.sun.com/docs/books/tutorial/
-Puce

Similar Messages

  • Checked and unchecked exception

    what is the differance between the checked and unchecked ecxeption.

    Any exception deriving from RuntimeException (which is a sublclass of Exception) is unchecked.
    All other exceptions derived from Exception class are checked ones.
    Checked exceptions are indicated by the throws clause. But unchecked exceptions are not.
    An example of unchecked exception is NullPointerException.
    A programmer should not write code to catch unchecked exceptions.

  • Checked and unchecked exceptions - when to use which ?

    Hi,
    Example:
    public void go(String[] args) {
       if(args.length==0)
          throw new //   <= what type of an exception should come here ?
    }Is there a good explanation when to use which one ? I know that generally
    unchecked exception are the exceptions associated with errors in the logic
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    (like files, networks problems ....).
    Thanks,
    Adrian

    There is no, "I think it is better to us a type-XXX exception here because of conditions 1, 2, and 3" scenario.
    Checked exceptions are of type java.lang.Exception and must be handled in one of two ways- try/catch constructs or having the method state it throws the checked exception.
    Unchecked exceptions are of type java.lang.Error or java.lang.RuntimeException. If the problem is an Error, something very bad has occurred like running out of memory. If it is a RuntimeError, then it probably came from a program bug. In both cases, there is no way for you to know when they will arise. Therefore the compiler does not force you to handle these unusual circumstances.
    If you think of piece of code may throw an error like an I/O operation, and you do not have code to handle that possibility, the compiler will let you know. After you have been programming long enough, you'll begin to know when you need try/catch constructs without Mr. Compiler yelling at you. ;-)
    Edited by: filestream on Sep 14, 2007 5:37 PM

  • Checked or Unchecked Exceptions

    I've had people explain the differences of checked exceptions and unchecked exceptions but I just can't seem to get it into my head. Can anyone help explain what the differences are?

    Exceptions: Most programs throw and catch objects that derive from the Exception class. Exceptions indicate
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    java.lang.NumberFormatException: For input string: "812D80EC6EF14B61BE1F3B6E9572FD09"
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         at java.lang.Long.parseLong(Long.java:419)
         at java.lang.Long.<init>(Long.java:678)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
         at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
         at oracle.jbo.domain.TypeConvMapEntry.convert(TypeConvMapEntry.java:84)
         at oracle.jbo.domain.TypeFactory.get(TypeFactory.java:869)
         at oracle.jbo.domain.TypeFactory.getInstance(TypeFactory.java:116)
         at oracle.jbo.server.AttributeDefImpl.convertToJava(AttributeDefImpl.java:2219)
         at oracle.jbo.server.ViewRowSetImpl.prepKeyForFind(ViewRowSetImpl.java:5377)
         at oracle.jbo.server.ViewRowSetImpl.findByKey(ViewRowSetImpl.java:5394)
         at oracle.jbo.server.ViewRowSetImpl.findByKey(ViewRowSetImpl.java:5296)
         at oracle.jbo.server.ViewRowSetImpl.findByKey(ViewRowSetImpl.java:5290)
         at oracle.jbo.server.ViewObjectImpl.findByKey(ViewObjectImpl.java:11536)
         at oracle.jbo.uicli.binding.JUCtrlHierBinding.bringNodeToRangeKeyPath(JUCtrlHierBinding.java:792)
         at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding.bringNodeToRangeKeyPath(FacesCtrlHierBinding.java:111)
         at oracle.adfinternal.view.faces.model.binding.RowDataManager.setRowKey(RowDataManager.java:130)
         at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding$FacesModel.setRowKey(FacesCtrlHierBinding.java:830)
         at org.apache.myfaces.trinidad.component.UIXCollection.setRowKey(UIXCollection.java:513)
         at oracle.adfinternal.view.faces.renderkit.rich.TableRendererUtils.isRowAvailable(TableRendererUtils.java:1737)
         at oracle.adfinternal.view.faces.renderkit.rich.TableRendererUtils.processAutoPPRUpdate(TableRendererUtils.java:403)
         at oracle.adfinternal.view.faces.renderkit.rich.TableRenderer.renderModelChanges(TableRenderer.java:951)
         at oracle.adfinternal.view.faces.renderkit.rich.TableRenderer.encodeAll(TableRenderer.java:578)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at org.apache.myfaces.trinidad.component.UIXCollection.encodeEnd(UIXCollection.java:617)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeCenterFacet(PanelStretchLayoutRenderer.java:879)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeCenterPane(PanelStretchLayoutRenderer.java:1294)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:351)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
         at oracle.adf.view.rich.render.RichRenderer.delegateRenderer(RichRenderer.java:1700)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelCollectionRenderer.access$1200(PanelCollectionRenderer.java:102)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelCollectionRenderer$PanelCollectionHelper._renderStretchedContent(PanelCollectionRenderer.java:788)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelCollectionRenderer$PanelCollectionHelper._encodeAll(PanelCollectionRenderer.java:922)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelCollectionRenderer$PanelCollectionHelper.access$700(PanelCollectionRenderer.java:616)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelCollectionRenderer.encodeAll(PanelCollectionRenderer.java:480)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
         at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer.access$500(ShowDetailItemRenderer.java:37)
         at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer$ChildEncoderCallback.processComponent(ShowDetailItemRenderer.java:630)
         at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer$ChildEncoderCallback.processComponent(ShowDetailItemRenderer.java:613)
         at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
         at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
         at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
         at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer._encodeChildren(ShowDetailItemRenderer.java:550)
         at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer.encodeAll(ShowDetailItemRenderer.java:121)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelTabbedRenderer.access$2300(PanelTabbedRenderer.java:44)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelTabbedRenderer$BodyEncoderCallback.processComponent(PanelTabbedRenderer.java:1535)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelTabbedRenderer$BodyEncoderCallback.processComponent(PanelTabbedRenderer.java:1478)
         at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
         at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
         at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelTabbedRenderer._renderTabBody(PanelTabbedRenderer.java:782)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelTabbedRenderer.encodeAll(PanelTabbedRenderer.java:217)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:279)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeCenterFacet(PanelStretchLayoutRenderer.java:879)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeCenterPane(PanelStretchLayoutRenderer.java:1294)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:351)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
         at oracle.adfinternal.view.faces.renderkit.rich.RegionRenderer.access$400(RegionRenderer.java:50)
         at oracle.adfinternal.view.faces.renderkit.rich.RegionRenderer$ChildEncoderCallback.processComponent(RegionRenderer.java:707)
         at oracle.adfinternal.view.faces.renderkit.rich.RegionRenderer$ChildEncoderCallback.processComponent(RegionRenderer.java:692)
         at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
         at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
         at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
         at oracle.adfinternal.view.faces.renderkit.rich.RegionRenderer._encodeChildren(RegionRenderer.java:297)
         at oracle.adfinternal.view.faces.renderkit.rich.RegionRenderer.encodeAll(RegionRenderer.java:186)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at oracle.adf.view.rich.component.fragment.UIXRegion.encodeEnd(UIXRegion.java:323)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at oracle.adfinternal.view.faces.taglib.region.IncludeTag$FacetWrapper.encodeAll(IncludeTag.java:547)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeCenterFacet(PanelStretchLayoutRenderer.java:879)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeCenterPane(PanelStretchLayoutRenderer.java:1294)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:351)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:279)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:279)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer.encodeFacet(DecorativeBoxRenderer.java:440)
         at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer._encodeCenterPane(DecorativeBoxRenderer.java:704)
         at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer.encodeAll(DecorativeBoxRenderer.java:380)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:279)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeCenterFacet(PanelStretchLayoutRenderer.java:879)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeCenterPane(PanelStretchLayoutRenderer.java:1294)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:351)
         at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
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