finally: The finally block is optional and can be used only with the try-catch block. We can provide multiple exceptions in the throws clause and it can be used with the main()method also.ĥ. The caller method might handle these exceptions or propagate it to its caller method using the throws keyword. throws: When we are throwing any checked exception in a method and not handling it, then we need to use the throws keyword in the method signature to let the caller program know that the exceptions might be thrown by the method. The throw keyword is used to throw an exception to the run-time to handle it.Ĥ. throw: Sometimes, we explicitly want to create an exception object and then throw it to halt the normal processing of the program. You can use multiple catch blocks with a single try.ģ. It must be used after the try block only. catch: The Java catch block is used to handle the exception. The try block contains at least one catch block or finally block.Ģ. If an exception occurs within the try block, that exception is handled by an exception handler associated with it.
INHERITANCE IN JAVA INTERVIEW QUESTIONS CODE
try: Enclose the code that might throw an exception within a try block. Java exception handling is managed via five keywords:ġ. What Are Exception Handling Keywords in Java? Read more at How the Exception Handling Works in Java with Example.ģ. If the runtime system exhaustively searches all the methods on the call stack without finding an appropriate exception handler, as shown in the following diagram, the runtime system (and, consequently, the program) terminates. Step 4: The exception handler chosen is said to catch the exception.
When an appropriate handler is found, the runtime system passes the exception to the handler.Īn exception handler is considered appropriate if the type of the exception object thrown matches the type that can be handled by the handler. The search begins with the method in which the error occurred and proceeds through the call stack in the reverse order in which the methods were called. This block of code is called an exception handler. Step 3: The runtime system searches the call stack for a method that contains a block of code that can handle the exception.
The following diagram shows the call stack of three method calls, where the first method called has the exception handler. The list of methods is known as the call stack. The set of possible "somethings" to handle the exception is the ordered list of methods that had been called to get to the method where the error occurred. Step 2: After a method throws an exception, the runtime system attempts to find something to handle it. Creating an exception object and handing it to the runtime system is called throwing an exception. The exception object contains information about the error, including its type and the state of the program when the error occurred. Step 1: When an error occurs within a method, the method creates an object and hands it off to the runtime system this object is called an exception object. How Does Exception Handling Work in Java?īelow steps demonstrates how the exception handling works in Java: Read more about exceptions in Java in the Java Exception Handling Guide! 2.
Can you throw any exception inside a lambda expression’s body?.What are the advantages of Java exceptions?.What is a stacktrace and how does it relate to an exception?.What is a try-with-resources statement?.What happens when an exception is thrown by the main method?.What is the difference between final, finally, and finalize in Java?.How do you write a custom exception in Java?.What is the difference between an exception and error?.What is the difference between throw and throws keyword in Java?.What is the difference between checked and unchecked exceptions in Java?.What is the purpose of the throw and throws keywords?.What are exception handling keywords in Java?.How does exception handling work in Java?.Let's explore the following questions, which are likely to appear in technical interviews for Java developers regarding exceptions.
INHERITANCE IN JAVA INTERVIEW QUESTIONS HOW TO
What is Abstract class in Java? How to define it?Īns: An abstract class in java is a class that is declared with an abstract keyword.Įxample of Abstract class: abstract class Test Ģ2.In this article, we will discuss 21 important Java exception handling interview questions with the answers.Ĭomplete beginner-to-expert, in-depth exception handling tutorial in Java!
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