Java Exception Handling and Errors Quiz
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Questions and Answers

What is the purpose of a try-catch block in Java?

  • To improve the performance of the program
  • To handle exceptions that may occur during execution (correct)
  • To execute code without interruption
  • To define variables within its scope
  • What happens if no catch block matches the type of the thrown exception?

  • The exception is automatically handled
  • The exception propagates to the next method in the call stack (correct)
  • The program continues execution without interruption
  • The program terminates immediately
  • How many catch blocks can be associated with a single try block?

  • Only one catch block is allowed
  • As many as needed to handle different exception types (correct)
  • Only the default catch block is allowed
  • Two catch blocks only - one for checked and one for unchecked exceptions
  • In which order should catch blocks be placed in relation to each other?

    <p>From most specific to most general</p> Signup and view all the answers

    What will the following line of code output: System.out.println(ex); if ex is an instance of NewException?

    <p>Exception value = 5</p> Signup and view all the answers

    What type of error occurs due to incorrect syntax or violations of Java language rules during the compilation phase?

    <p>Compile-time Errors</p> Signup and view all the answers

    Which example is a common runtime error encountered during the execution of a Java program?

    <p>Accessing an array element with an invalid index</p> Signup and view all the answers

    How are logical errors typically identified and fixed in a Java program?

    <p>By careful code review and debugging</p> Signup and view all the answers

    What happens when a runtime error occurs and is not handled in a Java program?

    <p>The program terminates abruptly</p> Signup and view all the answers

    Which of the following statements about compile-time errors is true?

    <p>They prevent the program from compiling until fixed.</p> Signup and view all the answers

    What mechanism allows Java programmers to handle exceptional situations during program execution?

    <p>Exception handling</p> Signup and view all the answers

    Which error type does NOT cause a program to generate an error message but results in incorrect behavior?

    <p>Logical Errors</p> Signup and view all the answers

    What term is used to describe errors that occur when a program is running, such as trying to divide by zero?

    <p>Runtime Errors</p> Signup and view all the answers

    What is the main purpose of using exceptions in a program?

    <p>To handle unexpected situations effectively</p> Signup and view all the answers

    Which type of exception is checked at compile-time by the compiler?

    <p>Checked Exception</p> Signup and view all the answers

    What happens when an unchecked exception occurs in a Java program?

    <p>The program may terminate without compilation error</p> Signup and view all the answers

    What keyword is used to create a user-defined exception in Java?

    <p>throw</p> Signup and view all the answers

    Which of the following is an example of an unchecked exception?

    <p>ArithmeticException</p> Signup and view all the answers

    How are exceptions represented in Java?

    <p>As classes derived from the Throwable class</p> Signup and view all the answers

    What is a characteristic of built-in exceptions in Java?

    <p>They are provided by Java libraries</p> Signup and view all the answers

    What must be understood to create a user-defined exception in Java?

    <p>Try-catch blocks and the throw keyword</p> Signup and view all the answers

    What happens when a 'throw' statement is encountered in a Java program?

    <p>An exception is thrown, disrupting the normal flow of the program.</p> Signup and view all the answers

    What type of exception will the catch block handle in the following code segment: 'catch(ArrayIndexOutOfBoundsException e)'?

    <p>Exceptions thrown when trying to access an invalid index of an array.</p> Signup and view all the answers

    In the context of exception handling, what does the 'throws' keyword indicate?

    <p>The method may throw specified exceptions to be handled elsewhere.</p> Signup and view all the answers

    Which of the following statements best describes a typical use case of the 'throw' keyword?

    <p>To explicitly signal an error within a method depending on specific conditions.</p> Signup and view all the answers

    What is the result of running the code segment with 'int a[]=new int;'?

    <p>A compile-time error occurs due to improper array initialization.</p> Signup and view all the answers

    In the context of catch blocks, which exception type is caught by the generic catch block 'catch(Exception e)'?

    <p>Any exception type that is a subclass of Throwable.</p> Signup and view all the answers

    What will the output be if an ArithmeticException is thrown in the try block of the MultipleCatchBlock1 class?

    <p>Arithmetic Exception occurs</p> Signup and view all the answers

    Which of the following statements is true regarding multiple catch blocks?

    <p>The first catch block that matches stops further evaluation of remaining blocks.</p> Signup and view all the answers

    Study Notes

    Types of Errors

    • Compile-time errors occur during compilation, caused by syntax errors, like missing semicolons or undefined variables. These prevent the program from compiling.
    • Runtime errors occur during program execution, caused by unexpected events like division by zero or accessing an invalid array index. These are handled with exception handling.
    • Logical errors result in incorrect program behavior, are hard to detect as they don't cause crashes, and require careful debugging and testing.

    Basic Concepts of Exception Handling

    • Exception is an event that disrupts the normal flow of a program.
    • Throwable is the root class for all exceptions in Java.
    • Built-in exceptions are provided by Java libraries.
      • Checked exceptions, also known as compile-time exceptions, must be handled by the programmer, usually within a try-catch block, or declared with the 'throws' keyword.
      • Unchecked exceptions are not checked during compilation, often caused by user input or runtime errors.
    • User-defined exceptions are custom exception classes extending the Exception class. They allow for specific exception handling in cases where the built-in exceptions are insufficient.

    Try and Catch Block

    • Try-catch block encloses code that may throw an exception.
    • Try block contains the potential exception-causing code.
    • Catch block handles specific exception types.
      • Multiple 'catch' blocks can be used to handle different exception types in order of specificity.

    Throw and Throws

    • Throw keyword explicitly throws an exception object from within a method.
    • Throws keyword indicates that a method might throw an exception of a certain type, requiring the caller to handle it.
    • 'throw' is used in the code, while 'throws' is used in method signature.

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    Related Documents

    JAVA Notes - Unit 5.pdf

    Description

    Test your knowledge on the types of errors in Java, including compile-time, runtime, and logical errors. This quiz also covers basic concepts of exception handling, throwable classes, and the differences between checked and unchecked exceptions.

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