Podcast
Questions and Answers
Which of the following is a type of error that occurs during the compilation phase?
Which of the following is a type of error that occurs during the compilation phase?
- Runtime Error
- Logical Error
- Runtime Exception
- Compile-time Error (correct)
What type of error occurs during the execution of a program?
What type of error occurs during the execution of a program?
- Compile-time Error
- Syntax Error
- Logical Error
- Runtime Error (correct)
What are logical errors also known as?
What are logical errors also known as?
Semantic errors or bugs
Compile-time errors generate error messages that prevent the program from compiling.
Compile-time errors generate error messages that prevent the program from compiling.
What is an exception in Java?
What is an exception in Java?
Which of the following is an example of a built-in exception in Java?
Which of the following is an example of a built-in exception in Java?
Checked exceptions are called _______ exceptions because these exceptions are checked at compile-time.
Checked exceptions are called _______ exceptions because these exceptions are checked at compile-time.
Unchecked exceptions need to be declared or handled at compile time.
Unchecked exceptions need to be declared or handled at compile time.
What keyword is used to throw your own exception in Java?
What keyword is used to throw your own exception in Java?
What type of exceptions are not checked by the compiler at compile-time?
What type of exceptions are not checked by the compiler at compile-time?
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Study Notes
Types of Errors
- Compile-time errors occur during compilation and indicate syntax errors or violations of Java's rules. Examples include missing semicolons, undefined variables, and type mismatches.
- Runtime errors occur during program execution and are caused by unexpected situations like division by zero, accessing an out-of-bounds array element, or trying to open a non-existent file. They are also known as exceptions.
- Logical errors are mistakes in program logic or algorithm that result in incorrect behavior without causing program crashes or error messages. They can be challenging to identify and require thorough debugging.
Basic Concepts of Exception Handling
- Exception Handling is a mechanism for managing unexpected events during program execution, making programs more robust.
- Exceptions are events that disrupt the normal program flow, representing errors like runtime errors, I/O errors, and arithmetic errors.
- Throwable class is the root of the exception hierarchy. Exceptions are represented by classes derived from this class.
Types of Exceptions
- Built-in Exceptions: Pre-defined exceptions available in Java libraries.
- Checked Exceptions: Checked at compile-time by the compiler. Examples include
FileNotFoundExceptionandIOException. - Unchecked Exceptions: Not checked at compile-time. Examples include
ArithmeticException,NullPointerException, andArrayIndexOutOfBoundsException.
- Checked Exceptions: Checked at compile-time by the compiler. Examples include
- User-defined Exceptions: Created by extending the
Exceptionclass, allowing custom exceptions for specific scenarios.
Example Code
-
Checked Exception:
- The provided code uses
FileInputStreamto read data from a file. - The
FileNotFoundExceptionis a checked exception that needs to be handled explicitly.
- The provided code uses
-
Unchecked Exception:
- The code demonstrates division by zero, leading to an
ArithmeticException. - This is an unchecked exception, meaning the compiler won't force you to handle it.
- The code demonstrates division by zero, leading to an
-
User-defined Exception:
- The provided code uses the
throwkeyword to manually throw a user-defined exception, allowing for customized error handling.
- The provided code uses the
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