Java Interview Questions On Exception Handling
Top 10 Java Interview Questions on Exception Handling
Java Interview Questions On Exception Handling
In a Java interview, candidates may be asked about exceptions and how they are handled in Java programs. Interviewers may inquire about the different types of exceptions, the difference between checked and unchecked exceptions, as well as how to use try-catch-finally blocks to manage exceptions. They might also ask about best practices for exception handling, such as dealing with exceptions at the appropriate level of abstraction and using specific exception types instead of catching generic exceptions. Additionally, candidates may be asked about how to create custom exceptions and ways to propagate exceptions up the call stack using throws keyword. It is important for candidates to demonstrate a solid understanding of exception handling in Java and how to effectively manage errors in their programs.
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1 - What is an exception in Java?
An exception in Java is an event that interrupts the normal flow of the program's execution. It occurs whenever the occurrence of a problem that prevents the program from continuing its normal execution.
2) What are the different types of exceptions in Java?
There are two main types of exceptions in Java: checked exceptions and unchecked exceptions. Checked exceptions are checked at compile time, while unchecked exceptions are not checked at compile time.
3) How can exceptions be handled in Java?
Exceptions in Java can be handled using try catch blocks. Inside the try block, the code that may throw an exception is written, and the catch block catches and handles the exception. Alternatively, exceptions can also be handled using the throws keyword to declare that a method may throw an exception.
4) What is the difference between final, finally, and finalize in Java?
The ‘final’ keyword in Java is used to declare a constant variable, a method that cannot be overridden, or a class that cannot be extended. ‘finally’ is a block of code that is always executed whether an exception is thrown or not. ‘finalize’ is a method in the Object class that is called by the garbage collector before an object is destroyed.
5) How do you create custom exceptions in Java?
To create custom exceptions in Java, you need to create a new class that extends either Exception or RuntimeException. You can add properties and methods to the custom exception class to suit your requirements.
6) What is the purpose of the throws keyword in Java?
The ‘throws’ keyword in Java is used to declare that a method may throw an exception. It is used in method signatures to indicate that exceptions may propagate up the call stack.
7) What is the difference between throw and throws in Java?
The ‘throw’ keyword is used to throw an exception explicitly within a method, while the ‘throws’ keyword is used in the method declaration to indicate that the method may throw an exception that needs to be handled.
8) How are exceptions propagated in Java?
Exceptions in Java are propagated up the call stack if they are not caught and handled. The exception is passed from method to method until it is caught and handled or until it reaches the top level of the call stack.
9) How can you prevent a NullPointerException in Java?
To prevent a NullPointerException in Java, you can perform null checks on objects before accessing their methods or properties. Using conditional statements like if else to check for null values can help avoid NullPointerExceptions.
10) How can you handle OutOfMemoryError in Java?
OutOfMemoryError is a serious error that occurs when the Java Virtual Machine (JVM) runs out of memory. To handle OutOfMemoryError, you can try increasing the heap size using JVM options like Xms and Xmx, optimizing memory usage in the application, and using tools like jvisualvm to monitor memory usage.
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