Java Exception Handling
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Questions and Answers

What is the difference between an error and an exception?

  • Errors indicate serious problems while exceptions are conditions within the code
  • Errors are conditions within the code while exceptions indicate serious problems.
  • Exceptions are conditions within the code while errors indicate serious problems. (correct)
  • Exceptions indicate serious problems while errors are conditions within the code
  • What is the syntax of try catch in Java?

  • try { //statements }
  • try { //statements } catch () { //error handling code }
  • try { //statements } catch (exception_type) { //error handling code } (correct)
  • try { //statements } throw (exception_type) { //error handling code }
  • What is the purpose of the finally block in Java?

  • To put important codes such as clean up code (correct)
  • To execute whether exception rise or not and whether exception handled or not.
  • To catch up exceptions by the corresponding catch block.
  • To pass the control of execution from try block to the catch block.
  • What type of exception is automatically thrown by the Java run time system?

    <p>Unchecked Exceptions</p> Signup and view all the answers

    What keyword is used to manually throw an exception?

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

    Study Notes

    • An exception can be anything that interrupts the normal flow of the program.
    • When an exception occurs program processing gets terminated and doesn't continue further.
    • In such cases we get a system-generated error message.
    • Exception can occur at runtime.
    • Reasons for Exceptions can include opening a non-existing file, network connection problem, class file missing which was supposed to be loaded, etc.
    • The difference between error and exception is that errors indicate serious problems and abnormal conditions that most applications should not try to handle, while exceptions are conditions within the code.
    • To terminate the program normally and to give a user-friendly error message to the user we have to handle the exceptions.
    • Exception handling using a try…catch block is the way to do this.
    • A try block must be followed by a catch block, or finally block, or both.
    • A catch block associated with a try block executes if an exception of a particular type occurs within the try block.
    • The syntax of try catch in Java is as follows:
    • try { //statements that may cause an exception } catch (exception_type) { //error handling code }
    • The flow of a try catch block is as follows:
    • If an exception occurs in try block, the control of execution is passed to the catch block from try block.
    • The exception is caught up by the corresponding catch block.
    • If the try block is not throwing any exception, the catch block will be completely ignored and the program continues.
    • If the try block throws an exception, the appropriate catch block (if one exists) will catch it.
    • All the statements in the catch block will be executed.
    • System generated exceptions are automatically thrown by the Java run time system. To manually throw an exception, we use the keyword throw.
    • Since exceptions in Java are type of Throwable, all Java methods use throw statement to throw an exception.
    • The throw statements required Throwable objects.
    • The exception class is the base class for all exception classes.
    • Types of Exceptions include checked exceptions (those that extend the Throwable class) and unchecked exceptions (those that extend RuntimeException).
    • It is important to declare any exceptions that a method might throw in the throws clause of the method if the compiler has been configured to check for them.
    • A try block can be followed by multiple catch blocks.
    • Each catch block must contain a different exception handler.
    • If an exception occurs in the try block then an exception is passed to the first catch block in the list.
    • If an exception type matches with the first catch block it gets caught, if not the exception is passed down to the next catch block.
    • The finally block in Java is used to put important codes such as clean up code.
    • The finally block executes whether exception rise or not and whether exception handled or not.
    • A finally contains all the crucial statements regardless of the exception occurs or not.

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    Description

    Test your knowledge about exception handling in Java with this quiz. Learn about the syntax of try-catch blocks, the role of catch and finally blocks, types of exceptions, handling system-generated and manually thrown exceptions, and the importance of declaring exceptions in the throws clause of a method.

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