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                ## final修飾符 **課堂代碼:** ~~~java package com.dodoke.demo3; public class Client { /** * 之前提到的常量,實際上是廣義上的常量,包括類,接口,方法等內容中定義的直接量 * 狹義上的常量指的是用final和static修飾的靜態變量(存在默認值) */ //定義常量 public final static String SCHOOL_NAME = "南通渡課IT教育"; /** * 常量定義注意點: * 1. 通常使用public修飾,當然其他訪問控制修飾符也可以 * 2. final和static可以位置互換 * 3. 常量名全部大寫,兩個單詞之間用下劃線鏈接 * * 定義的常量常用在: * 軟件系統中,某些固定的信息。比如秘鑰,系統名等需要被保護起來的信息 */ public static final void subClassMethod() { System.out.println("不能被重寫"); } public static void main(String[] args) { //The final field Client.SCHOOL_NAME cannot be assigned(指定) //Client.SCHOOL_NAME = "渡課IT教育主校區"; /** * 我們可以調用final修飾的內容,但是不能修改對應的內容 */ System.out.println(Math.PI); } } ~~~ ~~~java package com.dodoke.demo3; public class Client1 extends Client { /*public static void subClassMethod() { Cannot override the final method from Client }*/ } ~~~
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