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以下内容在同一个源程序中: abstract class A { abstract int num(); } class TestA { public st
以下内容在同一个源程序中: abstract class A { abstract int num(); } class TestA { public static void f(A t) { System.out.println(t.num()); } public static void main(String[] args) { f(new A() { int num() { return 20; } } ); } } 程序运行的结果是输出()。
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