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                ### [final 參數](https://lingcoder.gitee.io/onjava8/#/book/08-Reuse?id=final-%e5%8f%82%e6%95%b0) 在參數列表中,將參數聲明為 final 意味著在方法中不能改變參數指向的對象或基本變量: ~~~ // reuse/FinalArguments.java // Using "final" with method arguments class Gizmo { public void spin() { } } public class FinalArguments { void with(final Gizmo g) { //-g = new Gizmo(); // Illegal -- g is final } void without(Gizmo g) { g = new Gizmo(); // OK -- g is not final g.spin(); } //void f(final int i) { i++; } // Can't change // You can only read from a final primitive int g(final int i) { return i + 1; } public static void main(String[] args) { FinalArguments bf = new FinalArguments(); bf.without(null); bf.with(null); } } ~~~ 方法`f()`和`g()`展示了**final**基本類型參數的使用情況。你只能讀取而不能修改參數。這個特性主要用于傳遞數據給匿名內部類。這將在”內部類“章節中詳解。
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