Java Exception Handling 面试题与答案

问题 1. What is an exception in Java?

An exception is an event that disrupts the normal flow of the program's instructions during runtime.

Example:

int result = 10 / 0; // This will throw an ArithmeticException

问题 2. Explain the difference between checked and unchecked exceptions.

Checked exceptions are checked at compile-time, while unchecked exceptions are checked at runtime.

问题 3. What is the purpose of the 'finally' block in exception handling?

The 'finally' block is used to execute important code such as closing resources, whether an exception is thrown or not.

问题 4. How can you handle multiple exceptions in Java?

You can use multiple catch blocks or a catch block with multiple exception types separated by '|'.

Example:

try { /* code that may throw exceptions */ } catch (ExceptionType1 | ExceptionType2 e) { /* handle exception */ }

问题 5. What is the purpose of the 'throw' keyword?

The 'throw' keyword is used to explicitly throw an exception.

Example:

throw new CustomException("This is a custom exception");