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                ### [非靜態實例初始化](https://lingcoder.gitee.io/onjava8/#/book/06-Housekeeping?id=%e9%9d%9e%e9%9d%99%e6%80%81%e5%ae%9e%e4%be%8b%e5%88%9d%e5%a7%8b%e5%8c%96) Java 提供了被稱為*實例初始化*的類似語法,用來初始化每個對象的非靜態變量,例如: ~~~ // housekeeping/Mugs.java // Instance initialization class Mug { Mug(int marker) { System.out.println("Mug(" + marker + ")"); } } public class Mugs { Mug mug1; Mug mug2; { // [1] mug1 = new Mug(1); mug2 = new Mug(2); System.out.println("mug1 & mug2 initialized"); } Mugs() { System.out.println("Mugs()"); } Mugs(int i) { System.out.println("Mugs(int)"); } public static void main(String[] args) { System.out.println("Inside main()"); new Mugs(); System.out.println("new Mugs() completed"); new Mugs(1); System.out.println("new Mugs(1) completed"); } } ~~~ 輸出: ~~~ Inside main Mug(1) Mug(2) mug1 & mug2 initialized Mugs() new Mugs() completed Mug(1) Mug(2) mug1 & mug2 initialized Mugs(int) new Mugs(1) completed ~~~ 看起來它很像靜態代碼塊,只不過少了**static**關鍵字。這種語法對于支持"匿名內部類"(參見"內部類"一章)的初始化是必須的,但是你也可以使用它保證某些操作一定會發生,而不管哪個構造器被調用。從輸出看出,實例初始化子句是在兩個構造器之前執行的。
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