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:
finally block:
Comparison:
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 |
Maintain invariance, prevent overwriting and inheritance | Resource release, enforce execution Specific operations |
Example:
<code class="java">// 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 }</code>
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