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    hot java exception Job Interview Questions And Answers


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    Why don't preparation your interviews. Best and top asking questions java exception questions and answers. Prepare your job java exception interview with us. Most frequently asked questions in java exception interview. Top 10 most common java exception interview questions and answer to ask. java exception most popular interview question for fresher and experiences. We have good collection of java exception job interview questions and answers. Ask interview questions and answers mnc company.employee ,fresher and student. java exception technical questions asking in interview. Complete placement preparation for major companies tests and java exception interviews,Aptitude questions and answers, technical, interview tips, practice tests, assessment tests and general knowledge questions and answers.

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    Free Download java exception Questions And Answers Pdf.


    hot java exception FAQ java exception Interview Questions and Answers for Experiences and Freshers.


    What is Exception in Java?

    In simple word Exception is Java’s way to convey both system and programming errors. 
    In Java Exception feature is implemented by using class like Throwable, Exception, RuntimeException and keywords like throw, throws, try, catch and finally. 
    All Exception are derived form Throwable class. Throwable further divides errors in too category one is java.lang.Exception and other is java.lang.Error.  
    java.lang.Error deals with system errors like java.lang.StackOverFlowError or Java.lang.OutOfMemoryError while Exception is mostly used to deal with programming mistakes, non availability of requested resource etc.

    java exception interview questions for fresher and experience.

    java exception   2013-10-01 10:48:10

    What is difference between Checked and Unchecked Exception in Java ?

    Main difference between Checked and Unchecked Exception lies in there handling. 
    Checked Exception requires to be handled at compile time using try, catch and finally keywords or else compiler will flag error. 
    This is not a requirement for Unchecked Exceptions. 
    Also all exceptions derived from java.lang.Exception classes are checked exception, exception those which extends RuntimeException, these are known as unchecked exception in Java.

    java exception interview questions for fresher and experience.

    java exception   2013-10-01 10:49:29

    Exceptions are defined in which java package?

    All the exceptions are subclasses of java.lang.Exception

    java exception interview questions for fresher and experience.

    java exception   2013-10-01 10:59:27

    How are the exceptions handled in java?

    When an exception occurs the execution of the program is transferred to an appropriate exception handler.The try-catch-finally block is used to handle the exception.
    The code in which the exception may occur is enclosed in a try block, also called as a guarded region.
    The catch clause matches a specific exception to a block of code which handles that exception.
    And the clean up code which needs to be executed no matter the exception occurs or not is put inside the finally block

    java exception interview questions for fresher and experience.

    java exception   2013-10-01 10:59:57

    Explain the exception hierarchy in java.

    The hierarchy is as follows:

    Exception

    Throwable is a parent class off all Exception classes. They are two types of Exceptions: Checked exceptions and UncheckedExceptions. Both type of exceptions extends Exception class.

    java exception interview questions for fresher and experience.

    java exception   2013-10-01 11:04:56

    What is Runtime Exception or unchecked exception?

     Runtime exceptions represent problems that are the result of a programming problem. Such problems include arithmetic exceptions, such as dividing by zero; pointer exceptions, such as trying to access an object through a null reference; and indexing exceptions, such as attempting to access an array element through an index that is too large or too small. Runtime exceptions need not be explicitly caught in try catch block as it can occur anywhere in a program, and in a typical one they can be very numerous. Having to add runtime exceptions in every method declaration would reduce a program's clarity. Thus, the compiler does not require that you catch or specify runtime exceptions (although you can). The solution to rectify is to correct the programming logic where the exception has occurred or provide a check.

    java exception interview questions for fresher and experience.

    java exception   2013-10-01 11:06:01

    What is checked exception?

    Checked exception are the exceptions which forces the programmer to catch them explicitly in try-catch block. It is a subClass of Exception. Example: IOException.

    java exception interview questions for fresher and experience.

    java exception   2013-10-01 11:06:37

    What is difference between Error and Exception?

    An error is an irrecoverable condition occurring at runtime. Such as OutOfMemory error. These JVM errors and you can not repair them at runtime.Though error can be caught in catch block but the execution of application will come to a halt and is not recoverable.

    While exceptions are conditions that occur because of bad input etc. e.g. FileNotFoundException will be thrown if the specified file does not exist. Or a NullPointerException will take place if you try using a null reference. In most of the cases it is possible to recover from an exception (probably by giving user a feedback for entering proper values etc.)

    java exception interview questions

    java exception   2013-10-11 11:36:36

    What is difference between ClassNotFoundException and NoClassDefFoundError?

    A ClassNotFoundException is thrown when the reported class is not found by the ClassLoader in the CLASSPATH. It could also mean that the class in question is trying to be loaded from another class which was loaded in a parent classloader and hence the class from the child classloader is not visible.

    Consider if NoClassDefFoundError occurs which is something like

    java.lang.NoClassDefFoundError

    src/com/TestClass

    does not mean that the TestClass class is not in the CLASSPATH. It means that the class TestClass was found by the ClassLoader however when trying to load the class, it ran into an error reading the class definition. This typically happens when the class in question has static blocks or members which use a Class that's not found by the ClassLoader. So to find the culprit, view the source of the class in question (TestClass in this case) and look for code using static blocks or static members.

    java exception interview questions

    java exception   2013-10-11 11:37:28

    What is throw keyword?

    Throw keyword is used to throw the exception manually. It is mainly used when the program fails to satisfy the given condition and it wants to warn the application.The exception thrown should be subclass of Throwable.

     public void parent(){
      try{
       child();
      }catch(MyCustomException e){
    }
     }

     public void child{
       String iAmMandatory=null;
       if(iAmMandatory == null){
       throw (new MyCustomException("Throwing exception using throw keyword");
      }
     }
    java exception interview questions

    java exception   2013-10-11 11:39:00

    What is use of throws keyword?

    If the function is not capable of handling the exception then it can ask the calling method to handle it by simply putting the throws clause at the function declaration.

     public void parent(){
      try{
       child();
      }catch(MyCustomException e){}
     }
     public void child throws MyCustomException{
       //put some logic so that the exception occurs.
      }

    java exception interview questions

    java exception   2013-10-11 11:50:24

    What are the possible combination to write try, catch finally block?

    1) try{
    //lines of code that may throw an exception
    }catch(Exception e){
    //lines of code to handle the exception thrown in try block
    }finally{
    //the clean code which is executed always no matter the exception occurs or not.
    }

    2 try{
    }finally{}

    3 try{
    }catch(Exception e){
    //lines of code to handle the exception thrown in try block
    }


    The catch blocks must always follow the try block. If there are more than one catch blocks they all must follow each other without any block in between. The finally block must follow the catch block if one is present or if the catch block is absent the finally block must follow the try block.
    java exception interview questions

    java exception   2013-10-11 11:56:24



    hot java exception questions and answers for experienced


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