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                # 2-18.17、指出下面程序的運行結果。 ``` class A{ static{ System.out.print("1"); } public A(){ System.out.print("2"); } } class B extends A{ static{ System.out.print("a"); } public B(){ System.out.print("b"); } } public class Hello{ public static void main(String[] ars){ A ab = new B(); //執行到此處,結果: 1a2b ab = new B(); //執行到此處,結果: 1a2b2b } }   注:類的static 代碼段,可以看作是類首次加載(被虛擬機加載)執行的代碼,而對于類的加載,首先要執行其基類的構造,再執行其本身的構造 ```
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