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                # final 修飾符 final 可以修飾在類、成員變量、方法 * 如果修飾類:則該類不會被繼承(一般在開發中很少使用); * 如果修飾成員變量:一旦給成員變量賦值后就不允許修改其值,一般用在對常量的定義中。 * 如果修飾方法:該方法不能被重寫 > 在實際的開發中, final 用的最多的場景是結合 static 關鍵字定義類變量,即靜態變量。 > 定義為 final 另一個意圖就是將變量的值保護起來。 ~~~ public final class Demo { public final static String DEMO_VALUE = "demoValue"; public final void say() { System.out.println("demo"); } public static void main(String[] args) { String a = Demo.DEMO_VALUE; System.out.println(a); //Demo.DEMO_VALUE = "demoValue2"; } } ~~~
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