现有: public interface A {} 以下哪项声明是合法的?()
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现有: public interface A {} 以下哪项声明是合法的?()
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以下代码运行后输出的内容()interface AAA{ void fun(); } class BBB extends AAA{ public void fun() { System.out.println("fun"); } } public class Main { public static void main(String[] args) { AAA a = new BBB(); a.fun(); } }