The difference between final and finally in java

In Java, the final modifier declares a constant or an unmodifiable entity, and the finally block executes code in the try-catch-finally structure regardless of whether an exception occurs; constants can only be assigned once, and methods cannot be overridden. Classes cannot be inherited; finally blocks are usually used for resource release.

The difference between final and finally in Java

Clear answer:

In Java, final is a modifier used to declare a constant or a method or class that does not allow modification. And finally is a block used in a try-catch-finally structure to execute code that needs to be executed regardless of whether an exception occurs.

Detailed expansion:

final modifier:

• Constant: Use final The modified variable is a constant and can only be assigned a value once and cannot be changed later.
• Method: Methods modified with final cannot be overridden by subclasses.
• Class: Classes modified with final cannot be inherited.

finally block:

• try-catch-finally structure: The finally block appears after the try-catch block.
• Always executed: The code in the finally block will be executed regardless of whether an exception occurs.
• Resource release: finally block is usually used to release resources, such as closing a file or database connection.

Comparison:

##Purpose of useMaintain invariance, prevent overwriting and inheritanceResource release, enforce execution Specific operations

Features	final	finally
Purpose	Declare a constant or immutable entity	Execute code regardless of whether an exception occurs
Scope	Constant, method, class	try-catch-finally structure
Execution timing	One-time	No matter whether an exception occurs

Example:

// final 常量
public static final int MAX_VALUE = 100;

// final 方法
public final void doSomething() {
    // Cannot be overridden
}

// try-catch-finally 块
try {
    // 执行代码
} catch (Exception e) {
    // 处理异常
} finally {
    // 无论是否发生异常，都会执行此代码
}

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