Java Exception Handling 面试题与答案

问题 6. Explain the concept of 'try-with-resources' in Java.

'try-with-resources' is a feature introduced in Java 7 to automatically close resources like files or sockets when they are no longer needed.

Example:

try (FileReader fr = new FileReader("file.txt")) { /* code that uses fr */ }

问题 7. What is the difference between 'Error' and 'Exception'?

'Error' is thrown by the JVM and is not meant to be caught or handled, while 'Exception' is meant to be caught and handled.

问题 8. Can you have a try block without a catch block?

Yes, you can have a try block without a catch block if there is a finally block.

Example:

try { /* code */ } finally { /* cleanup code */ }

问题 9. What is the difference between 'finally' block and 'final' keyword?

'finally' is used in exception handling to define a block of code that will be executed whether an exception is thrown or not. 'final' is a keyword used to apply restrictions on class, method, and variable.

问题 10. What is the purpose of the 'throws' clause in method signature?

The 'throws' clause is used to declare that a method may throw one or more types of exceptions. It is part of the method signature.

Example:

void myMethod() throws CustomException { /* method code */ }