What does finally mean in java

Finally in Java is a code block that will always be executed after the code is executed, regardless of whether an exception occurs. It is used to release resources, maintain code integrity, and prevent resource leaks.

finally in Java

What is finally?

finally is a reserved keyword in Java that is used to define a block of code that will always be executed after the code is executed, whether this code executes successfully or throws an exception. It is often used to release resources (such as closing files or database connections).

finally Syntax

The finally code block usually follows the try-catch statement block:

try {
    // 需要尝试执行的代码
} catch (Exception e) {
    // 异常处理代码
} finally {
    // 无论try是否抛出异常，始终执行的代码
}

Purpose

finally has the following uses:

• Release resources: Ensures that resources are properly released after code execution, even if an exception occurs.
• Maintain code integrity: Ensure that the code is always in a clean state, regardless of whether an exception occurs.
• Prevent resource leaks: If the code throws an exception, the finally block can release acquired but not released resources.

Execution order

The finally block is executed under the following circumstances:

• It will be executed regardless of whether the try block throws an exception. .
• Executed after the try block or catch block executes, even if they throw an exception.
• Before returning, usually used for cleanup operations.

Note:

• finally blocks cannot return non-void values.
• Any exceptions in the finally block will be ignored and will not affect the execution of the finally block.

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